science, biology

41,328 results, page 63
  1. Honors Biology - URGENT!!!

    After a biochemical analysis of the victim's tissues, brilliant biologist/criminal investigator J. C. Mickleberry announced his findings: "Contrary to the conclusions of the police, the victim did not suffocate. The electron carriers in his mitochondria
  2. English

    Which of the following sentences best reflects chronological order? a. George Washington Carver became known for his research on plant biology. b. He attended Simpson College from 1890, and enrolled in Iowa State Agricultural College the following year.***
  3. Molecular cell Biology

    The following chemicals have the indicated formula weights:Sucrose-342.3,Potassium dihydrogen phosphate(KH2PO40-136.09,Tris -121.14.You also have the following solutions made:20%SDS,5M NaCl,500mM EDTA.You have a 40%glycerol solution and 10X TBE.List the
  4. English

    I forgot to add these few more things. They are really urgent. Thank you. 1) I told my collegues about the possibility of carrying out a Comenius project on how to write the screenplay and shoot (make) a film. 2) As a matter of fact, they would rather be
  5. Biology

    When elongated, tube-shaped cells from the lining of the intestine are treated with a certain chemical, the cells sag and become round blobs. The internal structures disrupted by this chemical are probably _____. A. cell junctions B. microtubules C. rough
  6. Biology

    A variety of snail has an inherited condition that affects the thickness of the shell. The alleles are t and n. tt have thick shells tn have thin shells nn do not survive Two heterozygous snails are mated. What is the probability that a surviving snail of
  7. biology

    __Glycolysis is used to gain energy from glucose. How efficient is it (give an actual number) in its ability to get the energy from glucose into ATP? (assume the organism is undergoing anerobic fermentation). __You are studying a particular reaction in
  8. Biology

    Punnett Square Help 1) Set up a Di-hybrid cross for these two traits (pod color and shape) Note:Green pods are dominate over yellow pods and inflated pods are dominant over constricted pods -Start off with both parents as heterozygotes/hybrids for BOTH
  9. Biology

    Write true or false: 1. A root hair is a small extension of an epidermal or outermost cell layer of a dicot root 2. Layers of parenchyma cells make up the cortex of a dicot root and the central pith of a monocot root. 3. Outside the endodermis is a tissue
  10. Biology

    Researchers in Africa found that a very high proportion of Masai, who routinely drink large quantities of milk, develop an amoebic infection after being given an iron supplement. Explain the role of lactoferrin in a diet and explain why the Masai get this
  11. Biology...

    1. References are made by the anatomist to the front,back,head and tail of the body. What anatomical reference terms are used to describe each of these directions? My answer: anterior, posterior, I am not sure with head and tail Is it superior and
  12. Biology

    Hey! :) When looking at the surface area to volume ratio of a cell it's meant to be that the larger this ratio the more efficient the cell is in diffusion etc. I don't get how a ratio of 6:1 though could be the larger ratio in comparison to 54:27...Im just
  13. science I NEED HELP....WORTH 45%OF MY GRADE

    wat is blasstoff like???? earth's orbit???????? wat do they do to stay healthy???? wat type of exercise do they do????? effect on weightlessness?????? atmosphere of the moon???? lunar soil and craters???? transportation on the moon???????? science
  14. biology

    The function of neurons is to a. maintain a difference in electrical charge across the cell membrane. b. have specific ions cross the membrane through ion channels. c. maintain a membrane potential with charged ions on either side of the cell membrane. d.
  15. Biology-9th grade

    I'm not sure how to answer one of my homework questions. Is one function of the alveoli to filter out dirt and pollen before it reaches the lung and why or why not. I don't think it is because the alveoli are used to oxgenate the blood, correct. I don't
  16. Biology

    All organisms in group 2(birds, fish, mammals, echinoderms, amphibians) except _______ are thought to share a common ancestor that possessed many of the same characterisitcs as the modern lancelets. A)echinoderms B)fish C)amphibians D)birds E)mammals
  17. Biology

    1. Muscles are grouped in antagonistic sets because: A. muscles cannot lengthen by themselves. B. muscles push but cannot pull. C. they do not like one another. D. there is an increase in metabolic efficiency if they are present in antagonistic sets. is it
  18. Biology

    Start by observing the living species around you. Ever wonder why a pollinator is attracted to a particular flower, or what would happen to predator species if a particular prey species is eliminated? If you were a scientist you could do an experiment to
  19. AP Biology

    Hi you guys I am having trouble with the cell communication chapter so I would really appreaciate if someone could help out with this question "What could happen to the target cells in an animal that lack receptors for local regulators?" I know that some
  20. Biology

    Suppose that black hamsters were found to be 70% of the population and the gray hamsters 30% of the population. Calculate the percentage of BB, Bb, and bb hamsters in the next generation. - I don't know how to calculate the percentage of the genotypes.
  21. biology

    if an alien entered your house what would you do to see if it was alive if it entered the house on its own I'd assume it was alive? tha alien was inside a spaceship. describe what you would do to see if it was alive. check for a pulse considering it has
  22. biology

    if a person exercise in a warm environment and if he exercise in a cool environment, will there be any difference between the amount of calorie he will lose?and if,in which environment he will lose more calorie? please explain the reason.
  23. Biology

    Tell what the function of lipids do in a cell. Is the correct answer: lipids function in a cell is to provide energy, act as structural components in a cell , and can help provide hormones.
  24. biology

    A researcher develops a new drug that kills cells by preventing transcription. The most direct effect of the drug is to prevent cells from? A. making new DNA. B. exporting substances to the cytoplasm. C. making protein. D. breaking down substances in the
  25. Biology

    Individuals whose characteristics are well-suited to their environment survive. Individuals whose characteristics ar not well-suited to their environment either die or leave fewer offspring. This principle Darwin called survival of the fittest. how i
  26. Biology

    which invertebrate made the transition to life on land,they forced two challenges- the first was to avoid drying out and the second was to develop a means to obtain oxygen. which invertebrate made the transition successfully and what adaptations have they
  27. Biology

    Are my answers correct? 1. What term describes the relationship of the ankle to the hip? Medial Proximal Distal this one Superior Anterior 2. What term describes the relationship of the nose to the mouth? Superior- this one Deep Anterior Inferior
  28. biology

    A cell with adefective p53 gene is likely to a. stop responding to growth regulators b. stop dividing to produce daughter cells ***** c. generate hormones that combat tumors d. produce cells without a defective p53 gene
  29. Biology

    sorry a few more questions why can DNA form fibres that allow it to seprate from RNA while RNA cant form such fibres? also, when treated with DNAse, I know DNA viscosity reduces because its cut up into smaller pieces. but on a graph of viscosity vs time, I
  30. College Math

    Your small library of books consists of 6 novels, 7 mathematics books, and 1 biology book. Calculate the number of ways to arrange them on a bookshelf for each of these situations. a) The books can be arranged in any order? b The novels must be together
  31. Biology

    Hi My bio HW is asking what are the symptoms and host response for tuberculosis.... i have the symptoms but I need help with what the host response are.... Thanks
  32. Biology

    H+Hb --> HHb HHb --> H+Hb which process is internal respiration and which process is external respiration???
  33. biology

    which of the following must be cycled through twice? a) Krebs Cycle b) Calvin Cycle c) Glycolysis d) Krebs and Calvin e) all of the above
  34. biology

    If gene A is at 48 map units and gene is at 54 map units- what is the recombinant frequency?
  35. Biology (multiple choice!)

    What’s one advantage to being eukaryotic rather than prokaryotic? What’s one advantage to being prokaryotic rather than eukaryotic?
  36. biology

    Name 3 life forms that change over time. What changes about these life forms as time passes?
  37. English

    i am trying to write a paper on Frankenstein. the question is "Is Frankenstein a work of science fiction?"....i have to write a persuasive essay...i believe that it is a work of science fiction...but as ussuall i need sources and proves from the book to
  38. Biology ms sue

    Hi ms sue you had answerd question abt whether culture ethic have influence over environmental ethics or vice Versa could it be that both have effect over each other ? Why only culture have effect over it ? Cause do environmental ethics change way we
  39. Biology

    The problems of survival of animals on land are very different from those of survivial of animals in an aquatic environment. Describe four problems associated with animal survival in terrestrial environments but not in aquatic environments. For each
  40. Biology

    can anyone tell me a little about MacArthur and Wilson's theory of island biogeography? I need to answer the question Describe a series of small habitats that exist within 10 to 20 kilometers of your house and which might be subject to MacArthur and
  41. Biology

    If P1 - virgin grey body, long wings female cross with P2 - ebony body vestigial wings male.... how do I figure out what the genotype is? I think it is like this... EVg for female and evg for male... but I honestly have no idea...
  42. biology

    names and defines the levels of organization that an ecologist studies identifies the level that you would choose to study if you were an ecologist; 3) describes the method or methods you would use to study this level; and 4) gives a reason for your choice
  43. Biology

    I am totally confused by what to do here: GGG CAT GGT CCT ATT TAC DNA coding strand sequence: DNA non-coding strand sequence: mRNA sequence: Amino acid sequence:
  44. Biology

    A stock protein sample that has a concentration of 250.0mg/ml. You need to dilute this sample to 20.0 mg/ml in buffer. The final volume of the diluted solution is 5.0ml. how much of the stock protein solution and buffer are required to achieve this? Answer
  45. biology

    On a hot, summer day, what would most likely be the limiting factor, the light reaction, or the dark reaction (in terms of photosynthesis)? I don't necessarily need the question answered. Rather, I don't quite understand how limiting factors, light and
  46. science research

    for my science project i have a research project report due tomorrow. can somebody please help me find atleast three reseach web links that can help with what i am searching about, how does color effect taste preferences or does color effect taste
  47. English help

    add the comma to the sentence As they studied the film they noticed some rules of science at work i wrote mine like this As they studied the film, they noticed some rules of science at work
  48. Biology

    Location in the digestive tract: mouth, pH: 6.8 Location in the digestive tract: stomach, pH: 2.0 Location in the digestive tract: duodenum, pH: 9.0 Based on this info, would a bolus of carbohydrate be acidic or basic? why?
  49. Science/Math/HElP

    Science- A 25N object is 3 meters up. How much potential energy does it have? our teacher said that the formula for finding out potential energy is PE = Mass * Gravity * Height. The gravity on Earth is always 9.8, but my problem is that instead of mass the
  50. Math

    In a group of 500 students, 150 are studying physics, 220 are studying biology, and 100 are studying chemistry. At least 25 students are studying more than one of these sciences. What is the greatest possible number of these students that might NOT be
  51. Biology

    Both photosynthesis and aerobic cellular respiration are examples of complex metabolic pathways, consisting of many linked chemical reactions that require enzymes to function. Briefly, explain two (ONLY TWO) attributes of enzymes in catalyzing chemical
  52. Biology!!!!

    Which blood vessel contains blood that has high oxygen concentration, low carbon dioxide concentration, and high pressure? 1. aorta 2. pulmonary artery 3. pulmonary vein 4. vena cava I wrote the answer as 3, but is wrong. Which one is the correct answer?
  53. Biology

    I don't know any info an the first semester and midterms are tomorrow please help ( Populations, Communities, and Ecosystems Chemistry of Living Things History of Life on Earth: The First Simple Cells History of Life on Earth: Complex Cells Cells and Their
  54. biology

    4. Both photosynthesis and aerobic cellular respiration are examples of complex metabolic pathways, consisting of many linked chemical reactions that require enzymes to function. Briefly, explain two attributes of enzymes in catalyzing chemical reactions
  55. Biology

    A mutant protist is found in which some mitochondria lack an inner mitochondrial membrane. Whcih of the following pathways would be completely disruped in these mitochondria? a) the citric acid cycle. b) oxidative phosphorylation. c) the citric acid cycle
  56. Science

    I have a science project du and im trying to look for a problem on why the sky is blue. I know that why the sky is blue is a question but i cant find the actuall "problem" The sky is blue because of Rayleigh scattering. I know of no problem with that fact.
  57. Biology

    20. When the blood enters the gill filaments in a fish, its carbon dioxide content is ________ and oxygen content is _____ a. low;high b. low;low c. high;high d. high;low D? I'm not sure about this question... Thanks -MC
  58. Biology

    What is a founder effect? How do you determine the age of a mutation? How is a dispersion route determined? How founder effect, determining the age of a mutations, and dispersion route link with ethnicity and disease risk?
  59. Biology

    In the inner mitchondrial membrane, hydrogen ions... A)are pumped in olny one direction. B)are pumped in both directions C)leak across in only one direction D)leak across in both directions http://cellbio.utmb.edu/cellbio/mitochondria_1.htm
  60. biology

    The ability of a forager to find food is often related to the ability of the forager to make decisions in the face of imperfect information about its environment. Discuss the effect that imperfect information has on foraging decisions.
  61. Biology

    A genotype represented by the letters TT is considered to be which of the following? A. Heterozygous dominant B. Homozygous recessive C. Homozygous dominant D. Heterozygous recessive A? Not sure
  62. Biology

    The function of a protein is determined by its ? Answer: shape The shape of a protein is determined by the ? of its ? ? First answer : ? Second two answers : primary structure
  63. English

    Sometimes words appear as though they begin with a prefix when they actually do not. Each of the following word groups contains a word that looks as though it begins with a number prefix, but does not. Write the word that has no prefix in the blank at the
  64. Biology

    1. Mitochondria and chloroplasts reproduce the same way free-living bacteria do—by _____________. My answer: Binary fission. 2. The tropism that allows seedlings to find their way out of the soil and into the sunlight is _________________. My answer:
  65. Math

    A college freshman must take a science course, a humanities course, an elective course, and a mathematics course for the first term of the school year. If he or she may select any of the six science courses, any of the four humanities courses, any of the
  66. Math

    A survey of 63 customers was taken at a bookstore regarding the types of books purchased. The survey found that 39 customers purchased mysteries​, 29 purchased science fiction​, 23 purchased romance novels​, 16 purchased mysteries and science
  67. Biology genetics

    A geneticist crossed two corn plants, creating a heterozygous decahybrid (ten traits). This decahybrid was then self-fertilized. How many different kinds of gametes were produced? What portion of the offspring were homozygous recessive? How many different
  68. Biology

    3. Which of the follwoing statements about sexual and asexual reproduction is FALSE? a. genetic diversity occurs in sexual reproduction b. asexually reproducing organisms can repair their own DNA c. there are no special reproductive celss in asexual
  69. Biology

    3. Which of the follwoing statements about sexual and asexual reproduction is FALSE? a. genetic diversity occurs in sexual reproduction b. asexually reproducing organisms can repair their own DNA c. there are no special reproductive celss in asexual
  70. Biology

    3. Which of the follwoing statements about sexual and asexual reproduction is FALSE? a. genetic diversity occurs in sexual reproduction b. asexually reproducing organisms can repair their own DNA c. there are no special reproductive celss in asexual
  71. biology

    you are investigating a crime. someone has died as a result of a gun shot from far away. The suspect claims that it couldn't have been him because he was with the victim at the time of the murder. they were in a restaurant eating pasta. how could you test
  72. Biology - Evolution

    Suppose you grabbed ten seeds from the large number of seeds that were present and planted them in a garden. During the summer you harvest 100 bean seeds from these 10 groups of plants? Would you wee the same distribution of seed size as when you first
  73. Biology- check my answer (diff one)

    Which of the following are true concerning living things? Check all that apply. A)They contain a vital force absent in nonliving things. B)They are composed of molecules that contain carbon-carbon bonds. C)They undergo chemical reactions to use energy they
  74. Biology

    the eventual evolution of living organisms on earth is based upon the following theory: during the early stages of the earth's history the chemical characteristics of the world changed as the conditions on the planet changed. The changes established the
  75. Biology

    The following chemicals have the indicated formula weight Surcose = 342.3g; Potassium dihydrogen=136.09; and Tris=121.14 Also the following solution already made: 20%SDS, 5M NaCl, 500mM EDTA. You have a 40% glycerol solution, and 10X TBE. List the step to
  76. Biology

    1. Plant seed coats, mycorrhizae, and cuticles are examples of a. ways plants have adapted to life on land b. evolutionary adaptations to limit water absorption c. mechanisms to enhance carbon dioxide release d. both B and C D? 2. Stomata help plants a.
  77. PHSICS

    1. How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s? Choose one answer.and explain a. 100 J. b. 50 J. c. 10 J. d. 5 J. 2. You have the grand idea that the science building would be better situated if you moved it North by 4
  78. MATH

    The FritzHugh-Nagomo equation occurs in many apps such as biology, genetics and heat transfer. In the 1-D case, it can be written as du/dt = d^2/dx^2 + u(u-1)(λ-u) where λ is constant. Show that this eqn supports a travelling wave u(x,t) =(Ae^n1
  79. Biology:renal clearance

    i want to calculate the renal clearance of creatinine. rate of urine production=0.8ml min-1 creatinine concentration in urine is 15.7 mg ml-1 Thank you for using the Jiskha Homework Help Forum. A good site for kidney problems is DaVita:
  80. Biology

    Some people experience “heartburn” when eating fatty, greasy foods (similar to the effect that is felt when eating acidic foods). Why would this occur with fats? I know fatty acids are made of carboxylic acid and if you have too much, would it make
  81. Biology

    In poultry, black color is due to a dominant factor (B). The recessive color is red (b). A red male bird is mated to a black female. They produce many offspring, half of which are black and half red. What are the genotypes of the parents?
  82. BIOLOGY

    Is eye color a discontinuous or continuous variation? Why is everyone saying that it's a discontinuous variation, when you obviously have a gradation of different colors around the world in the human population, and it's a polygenic trait determined by
  83. biology

    How can an understanding of the "mortality factor" lead to a successful biological control of pests in agriculture & horticulture? Check these sites.
  84. biology

    In both lecture and lab, the significance of water (H2O), molecular oxygen (O2), and carbon dioxide (CO2) has been emphasized with regard to their energy content or participation in metabolic oxidation and reduction reactions. This lab has demonstrated
  85. biology

    Help needed to draw a mating diagram where L is the dominant gene for the digestion of lactose and shows the crosses between two heterozygotes and wiht the the phenotypic and genotypic ratio of the offspring in the F1 generation. I also need to know the
  86. Biology -- repost

    (To whoever posted the first time -- DO NOT use any tutor's name where YOUR name should be. Impersonation of a tutor is not allowed on this website.) What are the biological terms of the following? 1.Reproductive structure in breadmould 2.acquired immunity
  87. AP Biology! DESPERATE!! HELP! due tom!

    describe atleast 4 ways an ectothermic organism's behavior helps it regulate its temperature.. this is from lab 11. i don't quite understand what its asking. like name 4 specific examples: ie: lying in the sun when cold, going in the shade when hot.. [i
  88. Biology

    OPEN ENDED: In a laboratory a scientist is experimenting with a synthetic enzyme called “hydrolase”. The goal of this enzyme is to bind to intracellular water and speed up hydrolysis RXNs within the cell, so that cells can break apart any polymer at a
  89. Biology

    Microorganisms develop resistance to antimicrobial drugs in a number of ways, EXCEPT A. Producing an enzyme that deactivates the antimicrobial drug B. Changing the cellular permeability to prevent the drug from entering the cell C. Interfering with the
  90. statistics

    The trends in international mathematic and science study (TIMSS) in 2007 examined eighth grade proficiency in math and science. The mean mathematics scale score for the sample of eighth grade students in the US was 508.5 with a standard error of 2.83.
  91. Biology

    A cell with replicated chromosomes. Pick haploid, diploid, or none. Explain why you chose the one you did. My answer:(I am not sure if this is complete enough?) I think it is a diploid, because diploids are copies of each chromosome. A chromosome pair
  92. Biology

    Hi I am doing a fetal pig dissection and i need some help answering questions. Should partially digested food be present in the stomach or small intestine of the fetal pig? Explain. What is the importance of the rich bloof supply surrounding the small
  93. Biology-plz helppp

    Mendels Law of independent assortment says that inheritance of one trait is not influenced by inheritance of another trait. Using what you know about meiosis , explain how you can observe the law of independent assortment in action.
  94. Biology

    light energy is converted to chemical energy in the process of Photosynthesis? The process where plants transfer solar energy into chemical energy to make organic molecules (glucose) is known as Photosynthesis also>?
  95. Math

    John has 4 math books, 6 biology books,, and 8 statistics books to arrange on a shelf. In how many ways can he arrange the books so that books on the same subject are grouped together?
  96. Biology

    Which of the following is true about DNA? It is a single-stranded molecules Only one of the original DNA strands acts as a template during replication. Both of the original DNA strands act as templates during replication. Its replication takes place in the
  97. 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
  98. science

    Select the choices in which work is done by recording "yes" or "no": 1. Reese completing her chemistry homework. NO? 2. the movers carrying Catalina's amplifier from the moving truck to her house. NO? 3. Li pushing his motorcycle down his driveway. YES? 4.
  99. Environmental Science

    Could you please explain the distinction between eutrophication and artifical eutrophication sense eutrophication is the natural process by which a body of water gains an abundance of nutrients? One is natural and occured long before man's time. The other
  100. Science Fair Research (Re: Music)

    I need 2 more pages to write about for my science fair research report and I ran out of topics to discuss. I am experimenting/researching on the effects of typing while listening to music. I have covered how the brain perceives music, modern examples of