Quiz 1

In an analysis of the nucleotide composition of any double stranded DNA, which of the following is true? a) G+T = A+C b) A=G and C=T c) A+T = G+C d) A+T/G+C = 1 e) A=C and G=T

G+T = A+C

The DNA double helix has a uniform diameter because ____, which have one ring, always pair with ____, which have two rings.

pyrimidines; purines

What nucleotide sequence represents the complement to following polynucleotide sequence: 5' - AGATCCG- 3'?

5' - CGGATCT - 3'

Cytosine makes up 20% of the nucleotides in a sample of DNA from a cellular organism. Approximately, what percentage of the nucleotides in this sample will be thymine and adenine?

60%

Which of the following is false? a) The double helix of DNA under physiological conditions is usually in the A-form b) In a nucleic acid double helix, pyrimidine always pairs with a purine c) DNA duplex with a higher G-C vs A-T content is more stable because it contains more hydrogen bonds d) The double helix of DNA under physiological conditions is usually in the B-form e) All nucleic acids with complementary sequences can form duplexes under appropriate conditions

A

Which of the following is inconsistent with the Central Dogma? Select all that apply. a) Transfer of information into RNA is irreversible b) Information in nucleic acids can be perpetuated c) Information in proteins cannot be perpetuated d) Transfer of information into protein is irreversible e) Transfer of information into DNA is irreversible

A and E

Which of the following is not a part of every amino acid? a) hydroxyl group b) hydrogen c) amino group d) alpha C e) carboxyl group

a) hydroxyl group

After mixing a heat-killed, fluorescent strain of bacteria with a live non fluorescent strain you discover that some of the living cells are now fluorescent. The best evidence that the ability to fluoresce is a heritable trait would be an observation that

descendants of the living fluorescent cells are also fluorescent

Deoxiibose differs from ribose by having:

one less oxygen

The primary structure of proteins is maintained (held) by

peptide bonds