Create
Learn
Share

Genetics chapter 13

rename
livelove90's version from 2012-04-02 14:43

Section

Question Answer
Which of the following are among the major components of prokaryotic ribosomes?
A)12S rRNA, 5.8S rRNA, and proteins
B)16S rRNA, 5.8S rRNA, and 28S rRNA
C)16S rRNA, 5S rRNA, and 23S rRNA
D)lipids and carbohydrates
E)18S rRNA, 5.8S rRNA, and proteins
C
The term peptidyltransferase relates to
A)base additions during mRNA synthesis.
B)peptide bond formation during protein synthesis.
C)elongation factors binding to the large ribosomal subunit.
D)discontinuous strand replication.
E)5' capping of mRNA.
B
The one-gene:one-enzyme hypothesis emerged from work on which two organisms?
A)E. coli and yeast
B)Drosophila and humans
C)Neurospora and humans
D)E. coli and humans
E)all of the above
C
The chain of adult hemoglobin is composed of a known sequence of 146 amino acids. In comparing the normal chain with the chain in sickle-cell hemoglobin, what alteration is one likely to find?
A)valine instead of glutamic acid in the sixth position
B)glutamic acid replacing valine in the first position
C)extensive amino acid substitutions
D)trinucleotide repeats
E)frameshift substitutions
A
The primary structure of a protein is determined by
A)the sequence of amino acids.
B)hydrogen bonds formed between the components of the peptide linkage.
C)a series of helical domains.
D)pleated sheets.
E)covalent bonds formed between fibroin residues.
A
One form of posttranslational modification of a protein includes
A)removal of introns.
B)shuffling of exons.
C)removal or modification of terminal amino acids.
D)removal of exons.
E)self-splicing.
C
Which protein class directly controls many of the metabolic reactions within a cell?
A)structural proteins
B)repressor proteins
C)operator proteins
D)enzymes
E)hydrophilic proteins
D
The secondary structure of a protein includes the following features:
A)gamma and delta domains.
B)alpha and gamma domains.
C) -helix and -pleated sheet.
D)hydrophobic clusters.
E)disulfide bridges.
C
Side groups of amino acids are typically grouped under which of the following categories?
A)polar, nonpolar
B)linear, circular
C)alpha, omega
D)long, short
E)primary, secondary
A
A protein is 300 amino acids long. Which of the following is the minimum number of nucleotides in the section of DNA that codes for this protein? (Remember, DNA is double-stranded.)
A)3
B)100
C)300
D)500
E)1800
E
By their experimentation using theNeurospora fungus, Beadle and Tatum were able to propose the far-reaching hypothesis that
A)prototrophs will grow only if provided with nutritional supplements.
B)several different enzymes may be involved in the same step in a biochemical pathway.
C)the role of a specific gene is to produce a specific enzyme.
D)genetic recombination occurred inNeurospora.
E)more than one codon can specify a given amino acid.
C
A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also shown:5'-AUGGUGCUGAAG:methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.)
A)methionine-valine-leucine-lysine
B)methionine-lysine-leucine-lysine
C)methionine-leucine-leucine-lysine
D)methionine-valine-methionine-lysine
E)methionine-methionine-leucine-lysine
E
memorize