Question :
31.Which of the following events occurs during the translation phase : 1309704
31.Which of the following events occurs during the translation phase of protein synthesis?
a.mRNA interacts with a chromosome.
b.Codon-anticodon base pairing occurs.
c.rRNAs carry amino acids to the site for protein synthesis.
d.More than one correct response.
e.No correct response.
32.Which of the following changes is associated with the post-translation processing of a protein?
a.Protein folding is completed.
b.Disulfide bridges are often formed.
c.The Met residue that initiated protein synthesis is removed.
d.More than one correct response.
e.No correct response.
33.Which of the following statements concerning genes and chromosomes is correct?
a.A gene is a segment of a DNA molecule that contains instructions for the synthesis of one or more proteins.
b.A chromosome contains several DNA molecules bound to protein.
c.Genes directly interact with amino acids during protein synthesis.
d.More than one correct response.
e.No correct response.
34.Which of the following statements concerning the codons of the genetic code is correct?
a.The total number of codons is 48.
b.All codons are specific for a particular amino acid.
c.Codons that specify the same amino acid are called polysomes.
d.More than one correct response.
e.No correct response.
35.Which of the following is a valid set of mRNA codons?
a.GGG, CCC and AAA
b.GGC, GGT and GGU
c.GAC, ACG and ACT
d.more than one correct response
e.no correct response
Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
a) All three statements are true.
b) Two of the three statements are true.
c) Only one of the statements is true.
d) None of the statements is true.
36.Statements:
(1) In general, RNA molecules are much smaller than DNA molecules.
(2) Recombinant DNA molecules contain DNA segments from two different organisms.
(3) In DNA replication, the action of the enzyme DNA helicase causes the DNA double helix to unwind.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
37.Statements:
(1) The type of DNA that contains exons and introns is rRNA.
(2) A “free” phosphate group is associated with the 5′ end of a nucleic acid.
(3) AMP and dAMP nucleotides differ in the sugar subunit that is present.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
38.Statements:
(1) The variable portion of a nucleic acid molecule is the sequence of bases attached to the nucleic acid “backbone.”
(2) A polysome is a complex containing several mRNA molecules that simultaneously participate in protein synthesis.
(3) T, A, and G are all fused-ring nucleotide bases.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
39.Statements:
(1) The acronym PCR stands for protein condensation reaction.
(2) A codon is a sequence of three nucleotides in an mRNA molecule that codes for a specific amino acid.
(3) Most of the mass of a chromosome is protein material rather than DNA.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
40.Statements:
(1) The complementary base-pair sequence for the DNA strand 5′ ACGTAT 3′ is
3′ TGCATA 5′.
(2) The only difference between DNA and RNA molecules is the identity of the sugar unit present in their nucleotides.
(3) Both strands of a daughter DNA molecule are formed through the linking of previously formed Okazaki fragments.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
41.Statements:
(1) In nucleotide formation, the base always attaches to the sugar at the sugar’s
C-1′ position.
(2) The genetic code is based on the concept that a single codon exists for each of the 20 standard amino acids.
(3) Codons are found in tRNA molecules and anticodons are found in mRNA molecules.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
42.Statements:
(1) Ribosomes, which contain rRNA, serve as sites for protein synthesis.
(2) In genetic engineering, one of the functions of restriction enzymes is to cleave the double-stranded DNA of a circular plasmid.
(3) The nucleotide units within a nucleic acid are linked to each other through sugar-base bonds.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
43.Statements:
(1) DNA nucleotides contain three subunits, and RNA nucleotides contain four subunits.
(2) Complementary base pairing in DNA involves the base combinations (A and T) and (G and C).
(3) The interaction between anticodon and codon governs the proper placement of amino acids in a protein.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
44.Statements:
(1) Nucleotides are related to nucleic acids in the same way that amino acids are related to proteins.
(2) Associated with the structure of tRNA molecules are “hairpin loops.”
(3) The bases A, G, and U are found in both DNA and RNA molecules.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
45.Statements:
(1) Several drugs containing synthetically modified nucleic acid bases block DNA synthesis as a means of blocking cancer cell replication.
(2) The mode of action for some antibiotics is inhibition of protein synthesis within bacteria.
(3) Antimetabolites are drugs that are DNA-replication inhibitors.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
