AP Bio chapter 17
A peptide has the sequence NH2-phe-pro-lys-gly-phe-pro-COOH. Which of the following sequences in the coding strand of the DNA codes for this peptide?
5' TTT-CCC-AAA-GGG-TTT-CCC
We now know that the one gene-one enzyme hypothesis is not entirely accurate because
A, B, and C
Which of the following are transcribed from DNA?
B and C only
Which component is not directly involved in the process known as translation?
DNA
Which of these correctly illustrates the pairing of DNA and RNA nucleotides?
GTTACG with CAAUGC
During RNA processing a(n) _______ is added to the 3' end of the RNA.
a long string of adenine nucleotides
A mutation results in a defective enzyme A. Which of the following would be a consequence of that mutation?
an accumulation of A and no production of B and C
The metabolic pathway of arginine synthesis is as follows. Beadle and Tatum discovered several classes of Neurospora mutants that were able to grow on minimal medium with arginine added. Class I mutants were also able to grow on medium supplemented with either ornithine or citrulline, whereas class II mutants could grow on citrulline medium but not on ornithine medium. From the behavior of their mutants, Beadle and Tatum were able to conclude that
class I mutants have a nonfunctional enzyme at step A, and class II mutants have one at step B.
All of the following are found in prokaryotic mRNA except
introns.
A codon
may code for the same amino acid as another codon.
What amino acid sequence will be generated, based on the following mRNA codon sequence? 5' AUG-UCU-UCG-UUA-UCC-UUG
met-ser-ser-leu-ser-leu
If A, B, and C are all required for growth, a strain mutant for the gene encoding enzyme B would be capable of growing on which of the following media?
minimal medium supplemented with "C"
Which of the following represents a similarity between RNA and DNA?
nucleotides consisting of a phosphate, sugar, and nitrogenous base
What is the sequence of a peptide based on the mRNA sequence 5' UUUUCUUAUUGUCUU 3' ?
phe-ser-tyr-cys-leu
A particular triplet of bases in the template strand of DNA is AGT. The corresponding codon for the mRNA transcribed is
ACU.
The nitrogenous base adenine is found in all members of which group?
ATP, RNA, and DNA
Which of the above is analogous to a single substitution mutation?
C (THECATARETHERAT)
Which of the above is analogous to a frameshift mutation?
D (THECATATTHERAT)
The figure below represents tRNA that recognizes and binds a particular amino acid (in this instance, phenylalanine). Which codon on the mRNA strand codes for this amino acid?
UUC
Which of the following mutations would be most likely to have a harmful effect on an organism?
a single nucleotide insertion downstream of, and close to, the start of the coding sequence
What enzyme catalyzes the attachment of an amino acid to tRNA?
aminoacyl-tRNA synthetase
According to Beadle and Tatum's hypothesis, how many genes are necessary for this pathway?
2
If proteins were composed of only 12 different kinds of amino acids, what would be the smallest possible codon size in a genetic system with four different nucleotides?
2
A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be
3' AAA-GAA-TAA-CAA 5'.
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?
900
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?
Answers C and D are correct.
If the triplet CCC codes for the amino acid proline in bacteria, then in plants CCC should code for
proline.
Suppose the following DNA sequence was mutated from 3' AGAGAGAGAGAGAGAGAG 5' to 3' AGAAGAGAGATCGAGAGA 5'. What amino acid sequence will be generated based on this mutated DNA?
ser-ser-leu
Spliceosomes are composed of
snRNPs and other proteins.
Translation occurs in
the cytoplasm.
