1. Because there are three hydrogen bonds between the bases guanine and cytosine
ID: 211495 • Letter: 1
Question
1. Because there are three hydrogen bonds between the bases guanine and cytosine, and two between adenine and thymine, GC-rich DNA will denature/melt
a. at the same temperature as AT-rich DNA, with some minor variations
b. at a higher temperature than AT-rich DNA
c. at a lower temperature than AT-rich DNA
d. in accordance with the animal or plant from which it was taken
2. The molecule represented below is part of
a. DNA
b. RNA
c. protein
d. peptidoglycan
3. Plasmids can be
a. beneficial to their host
b. transferred by conjugation
c. replicated in the nucleus of bacteria
d. Both (a) and (b) are correct
e. (a), (b), and © are all correct
4. Which statement is correct?
a. All strains of the species Escherichia coli have virtually the same genome size and gene content.
b. DNA replication in prokaryotes makes a lot of mistakes, leading to mutation rates of 1/1000.
c. DNA replication in prokaryotes requires no primer.
d. DNA replication in prokaryotes occurs at a single replication fork because their DNA is linear
e. DNA replication always proceeds from the 5'-phosphate of the incoming nucleotide to the 3'- hydroxyl group of the previously added nucleotide
5. Transfer RNA (tRNA) molecules
a. function to transfer ribonucleotides to RNA polymerase during transcription.
b. function to transfer the correct amino acids to the ribosome during translation.
c. encode a codon that is the same as the sequence of nucleotides in mRNA
d. do not function as described in (a), (b), and (c)
e. function as described in (a), (b), and (c)
6. When a codon reads AGC, one of the possible anticodons on the tRNA is
a. AGC
b. TCG
c. UCG
d. GCA
e. None of the above
7. In negative control of transcription, how does the presence of a co-repressor like the amino acids tryptophan or arginine affect transcription?
a. The co-repressor causes the repressor to bind to the operator, which blocks transcription.
b. The co-repressor binds to the repressor, which allows transcription to proceed.
c. The co-repressor binds to the operator, blocking transcription
d. None of the above mechanisms are correct.
8. Proteins that are needed in the cell at about the same level under all growth conditions, require ____________ expression
a. inducible
b. promotable
c. repressible
d. constitutive
Explanation / Answer
1. b. at a higher temperature than AT-rich DNA
2. a. DNA
3. d. Both (a) and (b) are correct
4. e. DNA replication always proceeds from the 5'-phosphate of the incoming nucleotide to the 3'- hydroxyl group of the previously added nucleotide
5. b. function to transfer the correct amino acids to the ribosome during translation.
6. c. UCG
7. b. The co-repressor binds to the repressor, which allows transcription to proceed.
8. d. constitutive
9. a. when the substrate of the enzyme is depleted.
10. d. All of the above are correct
11. a. is the transfer of DNA from one bacterial cell to another, and can even occur between distantly related organisms
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.