Why are nucleobases in nucleic acids called "bases"? 1. Because they resemble baseball bases 2. They are fundamental to "hodling up" the DNA structure (like the base of a building holds up the rest of the building) 3. They are the "command center" of the cell. Like the "base" of operations for armed forces in a war. 4. They are hydrogen ion acceptors, like other chemical bases

Why are nucleobases in nucleic acids called "bases"? 1. Because they resemble baseball bases 2. They are fundamental to "hodling up" the DNA structure (like the base of a building holds up the rest of the building) 3. They are the "command center" of the cell. Like the "base" of operations for armed forces in a war. 4. They are hydrogen ion acceptors, like other chemical bases

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter8: Dna Structure And Function

Section: Chapter Questions

Problem 9SA: Energy that drives the attachment of a nucleotide to the end of a growing strand of DNA comes from...

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Chemical analysis shows that a nucleic acid sample contains A, U, C, and G. Is this DNA or RNA? Why?
Which is not a nucleotide base in DNA? a. adenine c. glutamine e. cytosine b. guanine d. thymine f. All are in DNA.
One species DNA differs from others in its _______. a. nucleotides c. double helix b. DNA sequence d. sugar-phosphate backbone
Energy that drives the attachment of a nucleotide to the end of a growing strand of DNA comes from ________. a. the nucleotide b. DNA polymerase c. phosphate-group transfers from ATP
Which of the following statements about nucleic acids is not correct? Select one: A. In DNA the distance between the strands of the double helix is relatively constant. B. The growing DNA polymer is synthesized in the 5' to 3' direction. C. The enzymes that catalyze DNA synthesis are known as DNA polymerases. D. RNA strands are synthesized in the 3' to 5' direction. E. Unlike DNA, RNA is easily cleaved because the 2'-OH group of the ribose is a nucleophile that catalyzes hydrolysis of the strand.
The 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 bases
In the DNA structure, a purine molecule always binds with a pyrimidine molecule. How would you expect the structure to differ if Adenine forms base pairing with Guanine and Cytosine forms base pairing with Thymidine? Instead of A-T, G-C; can it be A-G, C-T? Justify your answer within five sentences
Which of the following correctly describes a structural feature of DNA or RNA? a. RNA may fold into complex three-dimensional structures necessary for its activity b. RNA & DNA are both usually double stranded c. DNA tends to fold into complex three-dimensional structures required for its activity d. DNA contains a pentose sugar with a hydroxyl group in the 2' position
Which of the following statement for the B-DNA helix is NOT true? a. It is a left-handed helix. b. Planes of bases are nearly perpendicular to the helix axis. c. Sugars are in the 2’-endo conformation. d. Bases are in the anti conformation. e. It is a common form of duplex DNA solution.
Pretend that you find life from another planet on an asteroid that lands in Annville. Its DNA is a triple helix composed of the bases A, T, G, C, X, and Y. The chemical composition of each is A = 24%, T = 23%, G = 11%, C = 12%, X = 21%, Y = 9%. How does the triplet DNA form in this organism?
The DNA helix is stabilized by I. hydrogen bonds between primary amine groups and keto groups II. stacking interactions III. favorable interaction between hydrophobic groups and hydrophilic groups IV. covalent bonds in the phosphodiester bonds III, IV II, IV I, II, IV I, II, III, IV
About 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.

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	1.	Because they resemble baseball bases
	2.	They are fundamental to "hodling up" the DNA structure (like the base of a building holds up the rest of the building)
	3.	They are the "command center" of the cell. Like the "base" of operations for armed forces in a war.
	4.	They are hydrogen ion acceptors, like other chemical bases