Biology, 29.01.2020 23:02, StupidFatChipmunk
1. a biologist discovers a new unicellular organism and isolates various components making up the organism. one component contains phosphate, uracil, adenine, ribose, guanine, and cytosine. which of the following could be the identity of this component? (1 point)
dna
repressor
trna
all of the above are correct.
2. which of the following are necessary for transcription? (1 point)
rna polymerase, dna, ribonucleotides
dna polymerase, rna, deoxyribonucleotides
rna polymerase, dna polymerase, dna
ribosome, trna, amino acids
3. what peptide would you expect to result from a 21-nucleotide-long dna sequence that contains only the base adenine?
a peptide composed of 7 phe
a peptide composed of 21 phe
a peptide composed of 7 lys
a peptide composed of 21 lys
4. after a strain of bacterial cells is exposed to a chemical mutagen, 30% of the cells produce new colonies that continue to grow. which of the following can be concluded?
some cells underwent beneficial mutations.
some cells underwent neutral mutations.
some cells underwent lethal mutations.
all of the above are correct.
5. a dna sequence reads -a-c-c-t-g-c-. which of the following statements is plausible?
mutation to -a-c-g-t-g-c- is a neutral mutation.
mutation to -a-a-g-t-g-c- is a frameshift mutation.
mutation to -a-c-c-t-g-t- is an advantageous mutation.
mutation to -a-a-g-t-g-c- is a lethal mutation.
Answers: 1
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