Campbell Essential Biology Plus Mastering Biology with eText -- Access Card Package (6th Edition) (Simon et al., The Campbell Essential Biology Series)
6th Edition
ISBN: 9780133909708
Author: Eric J. Simon, Jean L. Dickey, Kelly A. Hogan, Jane B. Reece
Publisher: PEARSON
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Chapter 5, Problem 11PS
HIV, the virus that causes AIDS, depends on an enzyme called reverse transcriptase to multiply. Reverse transcriptase reads a molecule of RNA and creates a molecule of DNA from it. A molecule of AZT, an anti-AIDS drug, has a shape very similar to (but a bit different than) that of the DNA base thymine. Propose a model for how AZT inhibits HIV.
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HIV, the virus that causes AIDS, depends on an enzyme called reverse transcriptase two multiply. Reverse transcriptase reads a molecule of RNA and creates a molecule of DNA from it. A molecule of AZT, an anti-AIDS drug, has a shape very similar to ( but a bit different than) that of the DNA base thymine. Proposed a model for how AZT Inhibits HIV.
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Campbell Essential Biology Plus Mastering Biology with eText -- Access Card Package (6th Edition) (Simon et al., The Campbell Essential Biology Series)
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- An American biochemist Erwin Chargaff discovered that in the cells of all organisms he studied, the amount of adenine is always equal to the amount of thymine, and the amount of cytosine is always equal to the amount of guanine. Explain his findings.arrow_forwardSome proteins such as DNA ligase can temporarily bind to DNA. If such a protein interacts with the sugar-phosphate backbone of DNA, would you expect hydrogen bonding between the protein and the DNA to be involved? Why or why not?arrow_forwardAbout how many nucleosomes could be made from a DNA strand consisting of 1000 B-helical turns? A. 5 B. 50 C. 500 D. This is not enough DNA to make even one nucleosome. The abbreviation dGp indicates: A. 3', 5' deoxyguanylate. B. 3' deoxyguanylate. C. 5' deoxyguanylate. D. 5', 3'deoxyguanylate.arrow_forward
- Consider how histone proteins bind to DNA and then explain why a salt solution with a high concentration can remove them from DNA (as shown in Figure 12.21b).arrow_forwardA) What is the difference between a nucleoside and a nucleotide? B) Give any two differences between DNA and RNA. C) Draw the structure of deoxyribose and ribose below, and number the carbons. What is the difference between the two structures? Please answer all 3 partsarrow_forwarddesign a analog of dna intercalator which has electrostatic interactions with DNA and crosslinks with dna. keep the oxygens in final product. use the provided structure to buildarrow_forward
- Which is a difference between B-DNA and A-DNA? A. For polynucleotide strands containing the same number of nucleotides, the B-DNA strand will be shorter from end-to-end than the corresponding A-DNA. B. Both are helical, but B-DNA is right-handed and A-DNA is left-handed. C. The sugar in A-DNA is more oxidized than that in B-DNA D. Helical structures in RNA predominantly adopt the B-DNA conformation. E. None of the above. The tetranucleotide AGTC (in DNA) has a free hydroxyl group on ____. A. A B. G, T, and C C. C D. A, G, T, and Carrow_forwardIn a single strand of DNA, is it ever possible for the number of adenines to be greater than the number of thymines? Describearrow_forwardDNA contains thymine rather than uracil. Why is the presence of thymine in DNA advantageous? What effect would the presence of uracil in DNA have on DNA repair?arrow_forward
- A person in shock may have pale, cold, and clammy skin and a rapid and weak pulse. What is the role of the autonomic nervous system in producing these symptoms? Discuss how drugs that influenceautonomic activity might be used to treat someone in shock.arrow_forwardDNA is a chemical that cells use to store information. Describe how information is encoded in DNA, and what this information actually represents.arrow_forwardThe following diagram of a generalized tetranucleotide will serve as a basis for the three questions marked “a” through “c.” (02) (a) Is this a DNA or an RNA molecule? State which _________ (b) Place an “X” (in one of the circles provided) at the 3' end of this tetranucleotide. (c) Given that the DNA strand, which served as a template for the synthesis of this tetranucleotide, was composed of the bases 5'- A C A G - 3', fill in the parentheses (in the diagram) with the expected basesarrow_forward
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