Most popular questions
  1. Biology

    The lignin present in the cell walls of both the sclerenchyma and xylem cells caused these tissues to dye the same color when exposed to the toluidine blue O stain. Speculate on the function of the lignin.

    asked by Pls answer on April 2, 2019
  2. Biology

    Draw map of nigeria and indicate the local biomes in the different state

    asked by Lee Mitchell on February 27, 2016
  3. Biology

    1.) Prophage occurs when a.) It bonds with carbohydrates to create a virus b.) Bacteriophage DNA embeds itself in host DNA c.) It detaches from carbohydrates to create a virus. d.) Bacteriophage DNA detatches itself from host DNA. D.

    asked by Help! on February 22, 2016
  4. Biology

    1. What are protists? (1 point) prokaryotes that are part of domain Archaea eukaryotes that are not part of the plant, animal, or fungi kingdoms single-celled organisms that belong to the plant, animal, and fungi kingdoms single-celled eukaryotes that are

    asked by Becky on May 16, 2016
  5. biology

    1. The table in Figure 12-3 showes the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff's rule, the percentages of guanine bases in chicken

    asked by Anonymous on January 3, 2017
  6. biology

    which of the following is not a part of the theory of evolution

    asked by jamie on May 13, 2014
  7. Biology

    Explain the processes that take place in the stroma including the reactants going in and the products produced from these processes in (a) bright sunlight and in (b) darkness. (c) What happens over an extended period of darkness of many days? I don't

    asked by Anonymous on October 30, 2015
  8. Biology

    In what situations would sampling work best for estimating population size, in what situations would mark and recapture work best and why?

    asked by Quentin on October 3, 2010
  9. biology

    Explain the processes that take place in the stroma including the reactants going in and the products produced from these processes in (a) bright sunlight and in (b) darkness. (c) What happens over an extended period of darkness of many days? I need HELP

    asked by blah on February 5, 2016
  10. Biology

    Suppose you are a scientist trying to help people who cannot produce an enzyme needed for proper digestion. How could you use genetic engineering techniques to make transformed bacteria that produce the enzyme?

    asked by BaileyBubble on December 17, 2012
  11. Biology

    Sort the terms and phrases as to whether they function in or describe primary growth or secondary growth? Place each term or phrase to the appropriate bin. If the term or phrase describes both primary and secondary growth, place it to the "both" bin. If

    asked by Thomas on March 9, 2014
  12. Biology

    Has anyone done the effect of cell size on material transport portfolio in Connections academy?

    asked by Amanda on October 28, 2016
  13. Biology

    1. When farming, overgrazing, climate change, and/or seasonal drought change farmland into land that cannot support plant life, it is called (1 point) a. desertification.

    asked by Olivia N J on October 6, 2016
  14. Biology

    1.) Do you think evolution is still taking place in the Galapagos finches? Why or why not? According to what I’ve learned yes evolution is still taking place in the Galapagos finches. Isolation and gene mutations cause species to evolve into different

    asked by Do my answers seem right? on February 2, 2016
  15. Biology

    A blue eyed man whose parents were brown eyed marries a brown eyed woman whose father was brown eyed whose mother was blue eyed they have one female child who is blue eyed make a pedigree chart based on the information above.

    asked by Kimberly on January 18, 2013
  16. Biology

    Explain how human activities can cause an imbalance in biogeochemical cycling and lead to problems such as cultural eutrophication and fish kills.

    asked by Ash on October 17, 2014
  17. biology

    1) Choose invertebrate to research. Explain how body plan and anatomy enables invertebrate to perform the essential functions it needs to survive. Explain how your chosen invertebrate fits into the cladogram of invertebrates. 2) Chordates (not a primate)

    asked by Carl Wheezer on April 4, 2017
  18. biology

    Which best describes Francis Bacon’s contribution to the Scientific Revolution?

    asked by sarah on February 27, 2018
  19. Biology

    Diagram the genotypes of the P1 pea plants from the previous four questions by placing the correct answer on its correct place.

    asked by Sabrina on August 12, 2014
  20. Biology

    Which of the following is a NOT function of a vacuole? packing of materials transport of materials storage of materials breakdown of materials I'm confused. I know that vacuoles store materials, in other words, C is not correct since it's true. But the

    asked by SkatingDJ on November 3, 2015
  21. biology

    Which of the following is the most important process specific to land-dwelling plants? a. production of photosynthetic pigments b. conservation of water c. exchange of gas d. presence of cell walls

    asked by Anonymous on November 25, 2018
  22. Biology

    Which parts of Lamarck's theory of evolution are no longer supported today? Choose two of the following. - Organisms change over time - Traits acquired during an organism's lifetime can be passed down to its offspring - War, famine, and disease help keep

    asked by SkatingDJ on February 3, 2016
  23. Biology

    Given the inefficiency of two of the pathways shown in figure 9-4, what advantage could there be to using these pathways to produce energy?

    asked by Anonymous on December 17, 2015
  24. Biology

    The matching strand to the one in Figure 12-7, reading from the bottom up, would be??? the figure is (from the bottom up) T C G A please help im so lost. :(

    asked by BaileyBubble on December 17, 2012
  25. biology

    1. how does the density of ice compare to that liquid water and why is that property important to aquatic oranisms a. the density of ice is higher than that liquid water, which means that ice forms from the bottom of lakes upward , protecting aquatic life

    asked by 9th grader on August 23, 2016
  26. Biology

    What is the advantage of highly folded membranes in a cell? Name an organelle that uses this strategy?

    asked by Tevon Pitts on October 28, 2014
  27. Biology

    Why do you think biologists use both the embryological development and the adult body plans to classify an animal? My answer: Biologists use both because there are many different phyla in the adult body plans. The embryological development help

    asked by SkatingDJ on May 11, 2016
  28. biology

    Bromothymol blue (BTB) is a chemical that turns yellow in the presence of carbon dioxide. In the presence of oxygen, BTB stays blue. In his science class, Sanjay used BTB to test for the presence of those two gases in three situations. *Sanjay's Procedure*

    asked by Cody on December 17, 2008
  29. biology

    do birds have true cavity, false cavity, or no cavity?

    asked by Anonymous on March 12, 2019
  30. Biology

    A woman who is a carrier for hemophilia marries a man who does not have hemophilia. What are the chances of them having a son or daughter with hemophilia? Show your work. I need help with this short-answer/essay/written problem. I think the answer to this

    asked by Anonymous on December 30, 2018
  31. biology

    Which is an ion found in a glass of water? i think it would be oxygen, correct?

    asked by Castermans.m on January 19, 2017
  32. Biology

    Knowledge about which of the following characteristics of a bacterium can help doctors prescribe the correct type of antibiotic to fight a bacterial infection? A) ability to conjugate B) mode of nutrition C) shape of the cells D) type of cell wall A?

    asked by kalia on April 3, 2019
  33. biology

    Choose the total number of each item requested below. 4C6H12O6 Carbon atoms Hydrogen atoms Oxygen atoms Molecules

    asked by Anonymous on October 29, 2012
  34. biology

    ap biology lab -what barriers might hinder the acquisition of plasmids

    asked by hannah on May 17, 2013
  35. Biology

    In the small intestine, the digestion of food molecules is completed and absorption occurs. Structures from the circulatory system are associated with the small intestine. Explain how these structures assist the small intestine in its function.

    asked by Sam on November 25, 2009
  36. biology

    given the inefficiency of two of the pathway shown in figure 9-4 what advantage could there be to using these pathway to produce energy?

    asked by Anonymous on February 29, 2016
  37. biology

    Communication between cells,tissues and organs.What Blood component?And mode action? Can someone help me please?

    asked by marie on November 12, 2012
  38. Biology

    In the classification of eukaryotes, protsists were once placed in a single kingdom. Briefly evaluate whether this classification system is accurate. Why might it be difficult to classify some slime molds as unicellular or multicellular? I know the first

    asked by SkatingDJ on March 30, 2016
  39. biology

    Cells such as neurons, which rarely if ever divide, can be explained as __________. A) being in the G0 phase of the cell cycle B) unable to activate apoptosis C) being in the G1 phase of the cell cycle D) having no active cell cycle I'm pretty sure it's A

    asked by Rylee on February 16, 2018
  40. biology

    1.What is the % concentration of oil in the first, second, and third trophic levels in our food chain? 2.How did the concentration of oil change from one trophic level to the next? 3.How does the change in concentration represent biomagnification? 4.How

    asked by kiesha on August 9, 2012
  41. Biology

    what are goals of science? Choose all that apply. A) to investigate the natural world B) to establish unchanging facts C) to explain natural phenomena D) to make useful predictions based on evidence

    asked by victoria on May 12, 2017
  42. biology

    All of the cells are in the very early stages of embryonic development and have not begun to differentiate into specialized types of cells. What type of cells would these be? A) gametes B) stem cells C) somatic cells D) epidermal cells

    asked by Angelina on December 6, 2016
  43. Biology

    1. All fungi are ~photosynthetic ~heterotrophic ~autotropic ~parasitic 2. What structure is missing in the fungal hypae shown on the right side of Figure 21-5? ~cell walls ~cross walls ~nuclei ~cytoplasm 3. Which of the following is true of fungi? ~Like

    asked by Becky on May 18, 2016
  44. Biology

    How did Mendel's novel approach contribute to his success in describing how traits are inherited?

    asked by Noah on February 1, 2008
  45. biology

    why do potatoes and onions have reducing sugar present.

    asked by dmoses on September 11, 2014
  46. Biology

    How do nucleotides and hydrogen bonds affect the structure of DNA? Maybe something like nucleotides make up DNA and hydrogen bonds hold the nitrogenous bases together?

    asked by Lana on November 13, 2015
  47. biology

    compare and contrast karyotype studies and pedigrees using a venn diagram

    asked by dustin on November 16, 2010
  48. biology

    1. Record your observations of the roots of the bean and radish plants in the appropriate data chart. Be sure to include a sketch of each plant’s roots. Answer: Data Chart: Bean Plant Nodules present? Number of nodules Number of pink nodules Number of

    asked by Sam on June 1, 2011
  49. Biology

    The endosymbiont hypothesis offers an explanation for how eukaryptoc cells could have obtained mitochondria and chloroplasts through a symbiotic relationship with prokaryotic cells that changed over time. What structural feature of prokaryotic cells might

    asked by Marisol on February 14, 2007
  50. biology

    A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur. Solution A: 3.21% (m/v) NaCl Solution B: 1.65% (m/v) glucose Solution C: distilled H2O Solution D: 6.97% (m/v) glucose Solution

    asked by sol on September 29, 2011
  51. Biology

    The meninges are membranes that serve to: protect the nervous system bathe the brain in cerebral spinal fluid carry nutrients to the brain clear waste products from the brain

    asked by M on January 2, 2019
  52. biology

    Which of the following is the definition of ecology? -the social movement with a goal to protect the environment -the recycling of human-made materials to reduce the waste going into landfills -the study of interactions among organisms and between

    asked by oto on September 13, 2016
  53. biology

    Are an organism's characteristics determined only by its genes? Explain. Yes, an organism's characteristics are determined only by It's genes becuase the parents give their offspring genes which determines their characteristics. Is my answer correct? Do I

    asked by franny on February 25, 2007
  54. biology

    7. If the baking soda had not been added, would there still have been a source of carbon dioxide being introduced into the water? Explain.

    asked by rosalie danenberg on October 28, 2010
  55. biology

    North American wolves can have gray fur or black fur. A single gene with two alleles codes for fur color. Information about the fur color of parents and offspring in four wolf families is shown below. Family 1 | gray fur x black fur | 3 gray fur : 2 black

    asked by elizabeth on January 2, 2019
  56. biology

    1. Suppose you plant a seed and observe that a tree of large mass grows from it. The tree achieves a final mass that changes very little for years afterward. Which of the following is true about the tree? (1 point) Both anabolic and catabolic reactions

    asked by 9th grader on September 2, 2016

    The forward primer was provided by the manufacturer as a lyophilized powder. If the manufacturer delivers 127.4 nmoles of this primer, what volume of buffer should you dissolve it in to make a 100 μM stock?

    asked by JEQPCR on March 26, 2013
  58. biology

    A cross between two pea plants with axial flowers and inflated pods gives the following offspringg: 20 with axial flowers and inflated pods, 7 with axial flowers and constricted pods, and 5 with terminal flowers and inflated pods. What is the most probable

    asked by liam on November 11, 2009
  59. Biology

    What would most likely happen to cells placed in fresh water? a- water would flow out because they are hypotonic to the external environment b- water would flow into them because they are hypotonic to the external environment c- water would flow out of

    asked by Steve on February 1, 2016
  60. Biology

    Compare and contrast indirect versus direct values of biodiversity, and provide examples.

    asked by David on October 17, 2014
  61. Biology

    Meiosis Lab First, review MITOSIS by labeling the PHASES of the cells in the onion root picture below? ( 1-18) I already have 1-4,11,14,16 and 17 filled in. here's the phase terms(can be used more than once): interphase, prophase, metaphase, anaphase, and

    asked by kaliyah on December 7, 2017
  62. Biology

    How are proteins, lipids, and polysaccharides similar? A) They contain the same atoms are types of bonds between atoms. B) They are natural polymers composed of repeating monomeric units. C) They are formed during exergonic metabolic reactions in a cell.

    asked by Victoria on May 12, 2017
  63. biology

    Explain how a scientist would use DNA or protien sequences taken from three different organisms to create a cladogram?

    asked by Lisa on December 17, 2014
  64. biology

    create a mnemonic for the 6 kingdoms they maybe in any order but you must have all 6

    asked by amanda on September 24, 2009
  65. 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?

    asked by sara on February 20, 2017
  66. Biology

    Which of the following statements correctly compares the functions of a plant's roots and stem? The stem contains a high percentage of cells that provide structural support, unlike the roots. The stem is the first part of the plant to emerge from a seed,

    asked by Madi on September 28, 2012
  67. Biology

    Please help with this, What was it important to have a detailed growth curve for your test plant (which was a Lemna spp.) sample on a frequent basis grown under control conditions without a test chemical?

    asked by Sally on March 17, 2011
  68. biology

    How is the earthworm’s digestive system adapted for extracting relatively small amounts of food from large amounts of ingested soil?

    asked by Anonymous on April 22, 2010
  69. Biology

    Wine is made by mixing yeast with grapes and allowing the yeast cells to undergo fermentation. Sparkling wine is a type of wine that contains high levels of dissolved carbon dioxide. What is the source of the carbon atoms in the carbon dioxide found in

    asked by Steve on February 1, 2016
  70. biology

    When exposed to bright sunlight, some people involuntarily sneeze. This reaction is known as a photic response. It is controlled by a single gene with two alleles, H and h. A man and a woman who sneeze when exposed to bright sunlight are both heterozygous

    asked by elizabeth on January 2, 2019
  71. biology

    when robert hooke observed cork through his compound microscope , all that he could see were empty chambers. why were hooke's chambers empty

    asked by idk on March 13, 2013
  72. Biology

    What would happen to other organisms if prokaryotes did not recycle nutrients? Please help, I just need a couple of sentences so I can understand what it means:/ Thanks

    asked by SkatingDJ on April 9, 2016
  73. biology

    Read the scenario. Loretta has a sample that contains a mixture of different DNA molecules. She would like to separate them by size to help her determine the length of each molecule. Which technique should she use? A- PCR B- Gel electrophoresis C- DNA

    asked by Rylee on March 5, 2018
  74. biology

    Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable phenotypes of the parents (P1)?

    asked by terbreon on January 22, 2015
  75. biology

    The structure that temporarily stores food in an amoeba is called the ____ a. heterotroph b. gullet*** c. vacuole d. autotroph

    asked by Anonymous on November 20, 2018
  76. Biology

    in guinea pigs, the allele for a rough coat (R) is dominant over the allele for smooth coat (r). Two guina pigs that are heterozygous for a rough coat, mate and produce offspring. What is the probability that the offspring will have a smooth coat?

    asked by celsea on November 10, 2017
  77. biology

    communication between cells,tissues and organs. IN What Blood component? What is the mode action? Can someone help me please?

    asked by marie on November 12, 2012

    Heat exhaustion caused by a person's exposure to heat can result in weakness or collapse. It usually involves a decrease in blood pressure. Explain why the homeostasis adjustment to heat can cause a drop in blood pressure. ---------- I'm not sure if I'm

    asked by Patrick on September 30, 2009
  79. Biology

    Suggest why Ia and Ib alleles are dominant over Io allele. Why in IaIo genotype, the Io allele is masked

    asked by Dean on June 4, 2015
  80. Biology

    Evaluate the difficulties with reintroduction programs using captive-born animals. thanks, Amber I have no idea

    asked by Amber on October 17, 2006
  81. biology

    During an experiment, a scientist observed prokaryotes that lived near the volcanic vents deep in the ocean. The scientist most likely observed a. photoautotrophs b. chemoautotrophs c. heterotrophs **** d. photoheterotrophs

    asked by Anonymous on November 29, 2018
  82. biology

    In rabbits, there are four different versions of the gene for coat color. What pattern of inheritance is this?

    asked by E on May 24, 2012
  83. biology

    draw a graph of balloon diameter vs. temperature. what is the correlation?

    asked by Janny on September 12, 2012
  84. Biology

    Describe two practical applications for being able to extract DNA from cells. Genetically engineering insulin producing bacteria Crime lab testing of blood (white cells have DNA) and semen what are some biome characteristics for a freshwater wetland

    asked by Anonymous on October 5, 2006
  85. biology

    (purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Account for the difference between the expected and experimental values.

    asked by dk on April 10, 2015
  86. biology

    If a brown-eyed man marries a blue-eyed woman and they have ten children, all brown-eyed, can you be certain that the man is homozygous? If the eleventh child has blue eyes, what will that show you about the father’s genotype?

    asked by laurie on November 15, 2010
  87. Biology

    The spinal accessory is a cranial nerve: True False I think it is true.

    asked by Biryani on January 2, 2019
  88. Biology

    1-how do the parts of the respiratory system worj togather? 2-how does the respiratory system work with other body systems? 3- which body system helps Respiratory system bring oxygen to body? A- circulatory B- excretory C- digestive D- muscular

    asked by Heleny on March 4, 2013
  89. biology

    1. Which of the following statements does not describe a difference between the DNA of prokaryotes and the DNA of eukaryotes ? a.prokaryotic DNA is shorter and less complex than eurkaryotic DNA b. Prokaryotic DNA chains have two nucleotides, eukaroyotic

    asked by Sven on May 1, 2013
  90. Biology

    Have I got the correct answers for all these questions? 1. Explain what genetic engineering is and how it can be applied to everyday life. Ans- Genetic engineering is a technology in which the genome of a living cell is modified for medical or industrial

    asked by mysterychicken on April 16, 2010
  91. Biology

    Miguel is on the hockey team at school. He is at practice when the coach asks him to cover the goal. How does the nervous system respond to Miguel needing to change direction while skating? A . For any movement in Miguel to occur, first a message or

    asked by Caitlyn on January 7, 2019
  92. Biology

    Looking at a cell under a microscope, you note that it is a prokaryote. How do you know? A. The cell lacks cytoplasm. B. The cell lacks a cell membrane. C. The cell lacks a nucleus. D. The cell lacks genetic material.

    asked by ti on November 15, 2018
  93. biology

    Explain how a scientist would use DNA or protien sequences taken from three different organisms to create a cladogram

    asked by Lisa on December 17, 2014
  94. biology

    Cells contain specialized parts known as organelles. These specialized parts perform very specific functions within cells. For example, chloroplasts capture energy from the Sun, mitochondria release energy stored in glucose, lysosomes aid in waste

    asked by Anonymous on February 3, 2019
  95. Biology

    A biology student is studying ways to grow crops in soils that are high in salts and other dissolved solids. To determine whether corn plants can tolerate salty soil conditions, she grows one corn plant in typical non-salty soil and one corn plant in the

    asked by Mellisa B on August 31, 2016
  96. biology

    What graphic could you use to best show the checkpoints in the cell cycle? a. line graph b. bar graph c. flowchart d. map I'm not sure, I think it's c?

    asked by Anonymous on March 19, 2014

    which of the follwing is best definition of science? A.a body of knwolege gathered throgh experiments. B.a process of accidental discorery. C. a search for answers to questions about the natural world. D. a method of asking testable questions based on

    asked by Lola on January 19, 2012
  98. biology

    Which of the following statements about the nucleus is NOT true? a. The nucleus stores coded instructions for making the cell's proteins.*** b. The nucleus usually contains a nucleolus region which is where ribosome assembly begins. c. The nucleus is the

    asked by Anonymous on August 22, 2018
  99. Biology

    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. c- radioactive

    asked by Steve on March 9, 2016
  100. Biology

    Why does scenedesmus colony consist of 4,8 or 16 cells?

    asked by Max on August 16, 2015