Question

Mutation of which of the following would result in the least disruption during development of a frog embryo? (1 point)
ribosomal protein gene
RNA polymerase gene
homeotic genes
melanin gene

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? (1 point)Some cells underwent beneficial mutations.
Some cells underwent neutral mutations.
Some cells underwent lethal mutations.
All of the above are correct.

Answer 1

@Kryten could you help my friend

Answer 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

Answer 3

Tryptophan is an amino acid that is synthesized via a series of metabolic reactions. The genes for the enzymes involved in tryptophan biosynthesis are encoded in an operon in E. coli, a prokaryote. The operon is regulated by a repressor, which changes its shape when tryptophan binds to it. Which of the following statements explains the action of the repressor? (1 point)
When tryptophan levels are high, it binds to the repressor, changing its shape so that it cannot bind to the operator region.
When tryptophan levels are low, it binds to the repressor, changing its shape so that it cannot bind to the operator region.
When tryptophan levels are high, it binds to the repressor, changing its shape so that it can bind to the operator region.
When tryptophan levels are low, it binds to the repressor, changing its shape so that it can bind to the operator region.

Answer 4

Which of the following do all cells in a multicellular organism have in common? (1 point)They all express the same genes.
They all have the same proteins.
They all have the same mRNA.
They all have the same DNA

Answer 5

Ill try to help i also tagged kryten he may be able to help

Answer 6

Thanks so much

Answer 7

first one is:
melanin gene
i think( biology is not my song but i can sing some songs :) )

Answer 8

@aaronq can you help

Answer 9

Haha thank you!

Answer 10

second one is:
All of the above are correct.
if i got it right that 30% of cells died and rest of them continued...

Answer 11

third one is i think:
RNA polymerase, DNA polymerase, DNA
but not sure...

Answer 12

and for rest im not sure at all...

Answer 13

What peptide would you expect to result from a 21-nucleotide-long DNA sequence that contains only the base adenine?


Figure 13-3

(1 point)a peptide composed of 7 phe
a peptide composed of 21 phe
a peptide composed of 7 lys
a peptide composed of 21 lys

Answer 14

sorry I'm kinda busy at the moment

Answer 15

Hey, could you send me the answers when you're done? I'm so behind in biology D: