what signals the cell to replicate the DNA?

5,403 results
  1. science 6th

    1. In which form of reproduction does the offspring grow specifically from the stem or root of a plant? A. fragmentation B. binary fission C. budding D. vegetative reproduction 2. Hydras are animals related to coral and jellyfish. Hydras can reproduce

  2. Science

    Which of these statements about DNA is true? A.All animals have DNA. B.DNA is a protein. C.DNA is to similar to use for grouping organisms. D.Proteins signal the cells to make DNA.

  3. cell biology

    How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was at the end of G2 of the cell cycle? a. The daughter cells have half the numbers of chromosomes and half the amount of DNA. b. The daughter cells have

  4. Biology

    1. Which of the following is not a characteristic of life? A. maintains homeostasis *** B. composed of cells C. composed of atoms D. carries out metabolism 2. Which of the following must be true to consider something to be alive? A. It must be able to

  5. Science

    Here’s the first one Which statement is most supportive of the claim that genetic diversity is an advantage of sexual reproduction? Genetic variation from sexual reproduction ensures that at least some individuals will have advantageous traits that help

  6. Evidence for Common Characteristics Quick Check

    Which of these statements about DNA is true? (1 point) O All animals have DNA. DNA is too similar to use for grouping organisms. O Proteins signal the cells to make DNA. ODNA is a protein.

  7. biology

    Why is conjugation in bacteria not considered to be sexual reproduction? Conjugation is a form of binary fission, which is asexual reproduction. Cell division occurs, but no DNA is shared. It can occur between different species. DNA is shared, but no new

  8. biology

    which of the following is not a characteristic of life A. maintains homeostasis B. composed of cells C. composed of atoms D. carries out metabolism which of the following must be true to consider something to be alive? A. it must be able to replicate it's

  9. Science

    How does a geneticist use pedigrees? A. to create genetic crosses. B. To replicate identical strings of DNA C. To prove that sex-linked traits are caused by codominant alleles D. To trace the inheritances of traits in humans

  10. Science

    1. What is a dendrite? A) It is a cell that sends signals to the central nervous system based on sensory input. B) It is the part of a neuron that carries information to the cell body. C) It is a cell that sends signals to the body to move. D) It is the

  11. biology 4

    one strand of DNA could be as long as a football field if it were stretched out lengthwise. One of the factors allowing DNA to fit inside the nucleus of a cell is its ability to: A. break apart into separate genes B. extend to form very long, thick

  12. Biology help needed bad!

    A biologist discovers a new unicellular organism and classifies it as a prokaryote. The cell is very small, contains a cell membrane, a cytoplasm, DNA in a nucleus, and no other cell organelles. Which statement below represents a correct response to the

  13. science

    1.The protein that carries oxygen in our blood is known as(1 point) A. hemoglobin.** B. amino acid. C. anemia. D. messenger RNA. 2.Which statement accurately describes sickle cell anemia?(1 point) A. It affects the functions of red blood cells of humans.**

  14. Biology

    1. Which of the following demonstrates the central dogma of molecular biologists?(1 point) Gene expression relies on environmental factors that determine which traits are dominant. DNA and RNA mutate into either harmful or helpful effects on the human

  15. Bio

    of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that: a. gamma contains more DNA than beta b. beta and gamma contains the same amout of DNA c. beta contains more RNA than gamma d. gamma contains 48

  16. Science

    10. Which of these does a virus need to multiply? A. chloroplasts from a host cell B. a host cell to provide oxygen C. new ADP from a host cell D. a host cell to replicate the virus's DNA***

  17. Bio

    A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1

  18. Biology

    How is cell differentiation different then mitosis? Cell differentiation does not cause proliferation Cell differentiation produces cells with different DNA******* Cell differentiation produces cells with different gene expressions Cell differentiation

  19. biology

    which of the following is not a characteristic of life A. maintains homeostasis B. composed of cells C. composed of atoms D. carries out metabolism which of the following must be true to consider something to be alive? A. it must be able to replicate it's

  20. Biology

    Which of the following statements regarding DNA and RNA is true? DNA can melt while RNA cannot. DNA is resistant to alkaline hydrolysis while RNA is not. DNA contains phosphodiester bonds while RNA does not. DNA can form double helices while RNA cannot.

  21. Science

    Bacteria, such as E coli are simple, single-celled (unicellular) organisms. Elodea, also known as water weed, is a plant that is commonly used in aquariums. Which of the following is a main difference in cell structure between an E coli and an Elodea cell?

  22. Biology

    In which cell of the human body would you expect to find the most mitochondria? Group of answer choices 1- A muscle cell in the leg muscle of a runner. 2- A red blood cell that transports oxygen. 3- A cell of the stomach lining that manufactures digestive

  23. Science

    Cloning Colly- A body cell was removed from sheep #1 and the nucleus and its DNA was removed from the body cell. An egg (gamete) was removed from sheep #4 and its nucleus from the egg was discarded. The nucleus and its DNA from sheep 1 is inserted into the

  24. biology

    Which of the following can result from a DNA mutation? (Select all that apply.) The DNA base-pairing rules change. The genetic information is changed. The structure and function of the proteins coded by the DNA change. A different version of the DNA

  25. Bio/math?

    The DNA in a human cell weighs approximately 2.0 x 10-12 grams. Calculate how many cells you would need to use to isolate 1 mg (milligram or 1x10-3 grams) of DNA, assuming you can get all the DNA out of a cell. I honestly don't know how to start and solve

  26. MS SUE PLEASE CHECK

    Here’s the first one Which statement is most supportive of the claim that genetic diversity is an advantage of sexual reproduction? Genetic variation from sexual reproduction ensures that at least some individuals will have advantageous traits that help

  27. AP Biology

    1.Oparin and Haldane hypothesized that the Earth's early atmosphere was strongly (2 points) acidic. oxidizing. reducing. ~~ ionic. 2.The most significant outcome of the Miller and Urey experiments was that they (2 points) synthesized living cells from

  28. ap biology

    10 . Which one of the following statements is NOT true about the resting potential? (28.3) [Hint] A. The neuron's plasma membrane is much more permeable to potassium than to sodium. B. The concentration of sodium is much higher inside the cell than

  29. science please help

    after the DNA strands are separated, which of the following is the next step of DNA replication in the S phase of the cell cycle? A) Action of helicase B) formation of RNA primer C) Breaking of hydrogen bonds D) joining of nucleotides i think it is either

  30. biology PLEASE ASSIST!!

    1.The structure and functions of the cell are controlled by what??? 2.Explain why DNA is able to play a role in the transmission of hereditary information. 3.State TWO functions of DNA 4. Explain how genetic fingerprinting can be used to prove is the

  31. Science

    Question 1- how does a multicellular organism develop? A- the cells differentiate. B- The cells shrink. C- One cell grows bigger. D- The cells replicate to form exact copies.

  32. AP Biology

    A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1

  33. AP BIO

    1. A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1

  34. science

    Nervous System Quick Check 1 of 5Items Assessment started: Nervous System Quick Check. Item 1 What is a dendrite? (1 point) It is the part of a neuron that carries information to the cell body. It is the part of the neuron that carries information away

  35. Science Ms.Sue

    Which phase in mitosis or meiosis are these 1.Chromosomes pair up and can exchange genetic material 2.The nuclear membrane in the daughter cells breaks down 3.The chromosomes line up along the center of the cell and two spindle fibers, one from each end of

  36. Science

    I did your corrections. I just wanted to know if all the sentences are correct from a scientific point of view. Thank you. 1) DNA contains instructions which decide which proteins a cell will make and consequently determines the whole chemistry of the

  37. biology check answers please

    The Hershey-Chase experiment proved that DNA was the hereditary material because. a) radioactive phosphorus in viral proteins was shown not to enter bacterial cells b) radioactive phosphorus in viral DNA was shown to enter bacterial cells **** (my choice)

  38. Science

    What is the function of DNA and where is it found in a eukaryote cell? A) sexual reproduction:ribosomes ***B) controls respiration:mitochondria C) regulates all cell activity:nucleus D) pass of like traits:endoplasmic reticulum Can someone check my answer?

  39. science

    hree light beams encounter a medium. One light ray is reflected, while the other two are absorbed. How can the medium be described? Transparent Translucent Opaque or Clear In satellite communication, does the satellite... Receive radio signals Prevent

  40. Psychology

    The means of travel within and between neurons is different because: A. electrical signals move impulses within the neuron, while chemical signals move the impulses between neurons. B. chemical signals move the impulses within the neuron, while electrical

  41. science

    Which describes a mutation? if it occurs in a body cell, the cell cannot continue to divide if it occurs in a sex cell, the cell automatically dies if it occurs in a body cell, it can be passed on to an offspring if it occurs in a sex cell, it can be

  42. science

    16. Which factors can affect a person’s height? a person’s karyotype genes only both genes and environmental factors a person’s blood type 17. How does a geneticist use pedigrees? to prove that sex-linked traits are caused by codominant alleles to

  43. Biology

    what signals the cell to replicate the DNA?

  44. BIology

    A cell cycle is exposed to intensive UV irradiation that results in damage to the cells DNA. Shortly after UV exposure, the cell receives signals telling it to undergo cell division. What are the most likely next events to occur in the cell? A- The cell

  45. Biology

    Word box : Synthesis, Lysosome, Enzymes, Mitochondrion, Cristae, self replicate, centrioles, nucleus, DNA, nucleolus, mitosis 1. The _____ inside the cell's control center are the instructions for a cell DNA? 2. During ____ the cell divides forming two

  46. genetic information

    I am doing a small (paragraph) section on the requirements of genetic information and I probably will put some of this in. It can be over anything. Is the below all correct? It must be an information carrier. It must be resistant to change. It must be able

  47. AP BIO

    2. Suppose the DNA molecule were composed of six monomers. In addition to the monomers A, T, C and G, two other monomers, O and P, were present. Furthermore, O and P were known to pair only with each other. Which of following statements regarding this kind

  48. Chemistry

    The DNA of an E coli cell measures 1.4 mm in length, when extended and 20 angstroms in diameter. a) Calculate the volume of DNA in an E coli cell in cm^3 b) What fraction of an E coli cell is occupied by its DNA? c) A human cell is typically spherical with

  49. biology

    Replication of the E. coli chromosome takes 40 to 45 minutes, but the organism has a generation time of 26 minutes. How does the cell have time to make complete chromosomes for each daughter cell? For each granddaughter cell? my reponse was that the cells

  50. Science

    Bacteria, such as E coli are simple, single-celled (unicellular) organisms. Elodea, also known as water weed, is a plant that is commonly used in aquariums. Which of the following is a main difference in cell structure between an E coli and an Elodea cell?

  51. Biology

    You allow one bacteria (circular DNA) to replicate in radioactive nucleotides so that any newly synthesized DNA strands use radioactive nucleotides. After 3 rounds of replication, how many DNA molecules have one strand of radioactivity and one strand

  52. medicine

    What is the main difference between a stem cell and a cancer cell? A. A stem cell grows at a faster rate than a cancer cell B. A stem cell obeys signals to stop growth, but a cancer cell doesn't C. A stem cell is usually external; a cancer cell is usually

  53. Sceince

    What is a dendrite? (1 point) It is a cell that sends signals to the central nervous system based on sensory input. It is a cell that sends signals to the body to move. It is the part of the neuron that carries information away from the cell body. It is

  54. chemistry

    - What fraction of an E coli cell is occupied by its DNA? How would I find the fraction? If I knew the volume of an E coli cell, would I divide that by the volume of DNA in an E coli cell? - A human cell is typically spherical with a diameter of 20

  55. Physiology

    The amount of DNA (measured in ng per mg ventricle) decreased. One nucleus is present in each vertebrate myocardial cell (each cell is mononucleated). Explain how it is possible that a decrease in mass-specific DNA concentration indicates growth of

  56. Can someone please help me asap. Biology

    Can someone confirm my answers? This is a new topic that I just learned in school and I'm a bit confused about it. So I'm not exactly sure about my answers. And this stuff is going to be on my midterm. What actions take place during G1? A) the cell doubles

  57. biology

    A human cell has 10 ^14 cells and each cell has about 6.4 x 10 ^9 nucleotide pairs of DNA. What is the length, in cm, of double helix that can be formed from the total amount of DNA in a human individual?

  58. science

    Which of the following demonstrates the central dogma of molecular biologists?(1 point) DNA and RNA mutate into either harmful or helpful effects on the human body. DNA and RNA hold the code to create proteins that are the key to gene expression. Gene

  59. Science

    what does DNA stand for? What is a gene? Where in the cell are chromosomes located? what two scientists established the structure of DNA? DNA is sometimes descrived as twisted ladder. What is this shape called? What forms the backbone of DNA? What forms

  60. Please check answers for science

    Here’s the first one Which statement is most supportive of the claim that genetic diversity is an advantage of sexual reproduction? Genetic variation from sexual reproduction ensures that at least some individuals will have advantageous traits that help

  61. JUST ANSWERRRR

    1. What is a dendrite? A) It is a cell that sends signals to the central nervous system based on sensory input. B) It is the part of a neuron that carries information to the cell body. C) It is a cell that sends signals to the body to move. D) It is the

  62. biology

    Hello, I got this question wrong on a homework assignment and I still can't find the correct answer. The reduction of the chromosome number during meiosis is most important for: 1: keeping the amount of DNA in the cell at a minimum level. 2: allowing the

  63. genetics

    The definition of transformation is: A.the shift of genetic information from DNA to protein. B.the recombination of DNA strands during meiosis C.the uptake of genetic information by a cell from the environment. D.the combining of DNA during fertilization.

  64. Advance Biology

    I have to find the correct term that best fits each definition. 1)The "transforming factor" that alters pneumonia bacteria 2)The three parts of every nucleotide 3)A pair of these forms a "rung" in the DNA ladder 4)Used to "label" DNA and protein in

  65. Science

    Why must chromosomes be duplicated before mitosis? DNA is the instruction of making proteins.To have a new cell that can work, it must has a replication of DNA.

  66. Science

    which of the following is a function of DNA 1)controlling the production of proteins in the cell 2)breaking down proteins in the cell 3)producing energy from food molecules inside the cell 4)controlling substances that enter and leave the cell 5)joining

  67. biology

    do you have basic cell structure typical plant vs animal cells organelles- stucture and function DNA DNA replication

  68. biology

    A nucleic acid probe is a(n) Group of answer choices enzyme that locates a specific restriction site on RNA. piece of radioactively labeled DNA that is used to locate a specific gene. virus that transfers DNA to a recipient cell. plasmid that recognizes a

  69. Genetics

    slight differences (mutations) in different individuals mean that some may survive while others perish. how did the Lederberg's demonstrate this. Briefly describe. If mutated DNA Sequence #1 occurred in a single cell, would it be a more serious problem in

  70. Science

    Can someone tell me if I answered my question correctly? During the cell cycle when does DNA replication take place? During interphase and the DNA synthesis separates the eukaryotic cells into four phases. Gap 1 phase is the intervals between mitosis and

  71. science please help

    after the dna strands are separated, which of the following is the next step of DNA replication in the S phase of the cell cycle? Action of helicase formantion of RNa primer breaking go hydrogen bonds joining of nucleotides i think either B or D

  72. bio

    o What are some of the benefits of squeezing so much data into virtually every cell in the body? o Why did humans not evolve with one central repository of DNA rather than having it replicated throughout the body? o Assume that the hereditary information

  73. Biology

    Which would have more DNA an average cell of a bacterium or a human cell? And what's the reason for it having more?

  74. English

    I'd like you to check these sentences grammatically. I also would like you to see if the terminology I used is correct. Help me improve my paragraph, please. 1)DNA contains instructions which decide which proteins a cell will make and consequently

  75. Science help please!!!!!!!

    Hi my textbook is not helping me at all, any links or ideas would be appreciated! What are some of the benefits of squeezing so much data into virtually every cell in the body? Why did we not evolve with one central repository of DNA rather than having it

  76. Science

    Hi my textbook is not helping me at all, any links or ideas would be appreciated! What are some of the benefits of squeezing so much data into virtually every cell in the body? Why did we not evolve with one central repository of DNA rather than having it

  77. biology

    A bacterium has a genome size of 6.0 X 106 base pairs. There is one Origin of Replication (ORI) and each DNA polymerase catalyzes the addition of 1,000 nucleotides/second. How much time is needed to replicate the entire genome?

  78. science

    What do transfer RNA molecules do during protein synthesis? copy the coded message from the DNA and carry it into the nucleus copy the coded message from the protein and carry it into the nucleus carry amino acids and add them to the growing protein copy

  79. science

    Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A, am I right? A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the

  80. Biology

    Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A, am I right? A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the

  81. Science

    mismatch error to be repaired? Which is the best answer, I think it's A. Can someone who know's science tell me if I am right? A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the

  82. Biology-Is my answer correct

    Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A, am I right? A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the

  83. Science-important!

    Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A or B. A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the synthesis

  84. science

    Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A or B. A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the synthesis

  85. Genetics

    A researcher who has pioneered cell-free fetal DNA testing to detect trisomies has received threats from people accusing her of killing babies. she counter that the test will actually saves lives. explain how the test can do this the accuracy statistics on

  86. Biology

    14. The major components of a DNA molecular subunit are a. a chromosome, deoxyribose, and double helix b. a five-carbon sugar, phosphate group, and a nitrogen-containing base c. adenine, guanine, cytosine, and thymine d. all of the above D 16. During DNA

  87. biology

    I am absolutly 100% biology stupid... I don't understand it, it is like a foriegn language to me... this is my questions. What are some of the benefits of squeezing so much data into virtually every cell in the body? · Why did humans not evolve with one

  88. biology

    how is dna protected inside a cell ? how is nucleic acid protected in a prokaryotic and eucaryotic cell? links would be appreciated

  89. BIOLOGY

    which following of the aspects of the cell cycle would be most disrupted by cytochalasin B SPINDLE FORMATION CLEVAGE FURROW CELL ELONGATION DNA SYNTHESIS SPINDLE ATTACHMENT

  90. Science

    Three light beams encounter a medium. One light ray is reflected, while the other two are absorbed. How can the medium be described? Transparent Translucent Opaque or Clear In satellite communication, does the satellite... Receive radio signals Prevent

  91. Biology

    Using RNA a s a template for prot e in synthesis instead of t r ans l a t ing prot e ins directly from the DNA is advantageous for the cell because A) RNA is much more stable than DNA. B) RNA acts as an expendable copy of the genetic material, allowing the

  92. Psychology

    The means of travel within and between neurons is different becuase: a. eletrial signals move impulses within the neuron, while chemical signals move the impulses between neurons. b. chemical signals move the impulses within the neuron, while electrical

  93. Science Question

    Griffith's experiments along with Avery, MacLeod and McCarty helped to determine the transforming factors of Pneumococcus bacteria. Using heat-killed S-strain bacteria and one particular fraction of the cell lysates, they were able to demonstrate that

  94. Psychology

    The means of travel within and between neurons is different because: A. electrical signals move impulses within the neuron, while chemical signals move the impulses between neurons. B. chemical signals move the impulses within the neuron, while electrical

  95. Biology

    1. Creates energy in the form of ATP 2. The gel-like liquid that fills the cell 3. Sorts, packages, and sends out proteins 4. Helps the chromosomes divide faster in animal cells only 5. Creates food energy from sunlight energy 6. Responsible for digestion

  96. Biology

    In the final step of DNA extraction from E. Coli bacteria, we used ethanol so that the DNA would precipitate. Why is it that DNA precipitates in ethanol, and not in water? Both of them are polar solvents, and so is DNA. So why doesn't water make DNA

  97. Biology

    Which of the following cells check for during the G2 check point? a. Growth hormone c. DNA integrity b. Nutritional status d. Cell size In mitosis, if a cell has 4 chromosomes in prophase, how many chromosomes will this cell have in metaphase? a. 64 b. 32

  98. Biology

    During the ______ pathway, a host cell infected with a virus lyses and releases new virus particles. During the _______ pathway, viral DNA replicates along with the cell, but new viruses are not immediately produced. Please help!

  99. science/biology

    Read the scenario. A graduate student is running a PCR reaction to study DNA extracted from an Egyptian mummy. The reaction does not seem to be working, so he checks his notes to see what he added to the reaction mix. He find the following list: mummy DNA,

  100. Biology helppppppp

    1. Why was communication through books, letters, and lectures such an important factor in the development of the cell theory? What do you think would happen if scientists today were unable to communicate with each other? In science, we build on the works

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