AP Bio test Chapter 17 and 18

For a couple of decades, biologists knew the nucleus contained DNA and proteins. The prevailing opinion

...

A particular triplet of bases in the template strand of DNA is AGT. The corresponding codon for the mRNA transcribed is

ACU

Which of the following is not directly involved in the process of translation

a) ligase

A transcription unit that is 8,000 nucleotides long may use 1,200 nucleotides to make a protein consisting of 400 amino acids. This is best explained by the fact that

a) many noncoding nucleotides are present in mRNA

Introns are significant to biological evolution because

a)their presence allows exons to be moved around more easily, creating proteins with new combinations of functional domains

Chose the answer that has these events of protein synthesis in the proper sequence

b) 4,1,2,5,3

Which point mutation would be most likely to have catastrophic effect on the functioning of a protein

b) a base deletion near the start of the gene

What are the coding segments of a stretch of eukaryotic DNA called

b) exons

A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of a phenylalanine. THe consequence of this for the cell will be that

b) proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU

Which of the following is not related to ribosomal activity?

b) spliceosome

A peptide has the sequence NH2- phe-pro-lys-gly-phe-pro-COOH. Which of the following sequences in the coding strand of DNA codes for this peptide

c) 5' TTT-CCC-AAA-GGG-TTT-CCC

Which of the following does not occur during the termination phase of translation

c) A tRNA with the next amino acid enters the P site

The nitrogenous base adenine is found in all members of which group

c) ATP, RNA, and DNA

All of the following are found in prokaryotic mRNA except

c) introns

What is the effect of a nonsense mutation in a gene

c) it introduces a stop codon into the mRNA

What is the most abundant type of RNA

c) rRNA

A particular eukaryotic protein is 300 amino acids long . Which of the following could be the maximum number of nucleotides in the DNA that codes for the amino acids in this protein

d) 900

During translation, chain elongation continues until what happens

d) a stop codon is encountered

If a b and c are all required for growth, a strain mutant for a gene encoding enzyme B would be capable of growing on which of the following media

d) minimal medium supplemented with C

Which of the following represents a similarity between RNA and DNA

d) nucleotides consisting of a phosphate, sugar, and nitrogenous base

Which of the following is/are true about RNA

d) only A and C are true

What is one function of a signal peptide

d) translocate polypeptides across the ER membrane

A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be

e) 3' AAA-GAA-TAA-CAA 5'.

Accuracy in the translation of mRNA into the primary structure of a protein depends on specificity in the

e) both C and D

If a b and C are all required for growth, a strain that is mutant for the gene encoding enzyme A would be able to grow on which of the following media

e) both C and D are correct

What is the sequence of a peptide based on the mRNA sequence 5'UUUUCUUAUUGUCUU

e) phe-ser-tyr-cys-leu