Question : 61.What the term used to describe complexes of many ribosomes : 1318513

61.What is the term used to describe complexes of many ribosomes all simultaneously translating a single mRNA?

A)  carcinogens    B)  promoters    C)  polysomes    D)  codons    E)  mutagens

62.Approximately how many human genetic diseases have been described?

A) 500

B) 1500

C) 4000

D) 12,000

E) 150,000

63.Which of the statements concerning the nucleotide with the name adenosine-5’-monophosphate (AMP) is FALSE?

A) It is a ribonucleotide.

B) It is composed of ribose, adenine, and a single phosphate group.

C) It is found in RNA only.

D) The phosphate group is attached to the 5’ carbon of adenine.

E) All of the statements are true.

64.Which of the following changes in a DNA molecule may have no effect on the protein for which the DNA codes?

A)A deletion mutation.D)Changing the second base in a triplet.

B)Formation of a thymine dimer.E)Changing the third base in a triplet.

C)Changing the first base in a triplet.

65.The Ames test is used for which of the following purposes?

A)To test for the presence of the HIV virus.

B)To test for mutagenic effects of compounds.

C)To identify individuals by DNA fingerprinting.

D)To test for carriers of genetic diseases.

E)To test for the presence of DNA in a sample.

66.How are the correct amino acids brought to the ribosomes for protein synthesis?

A) The amino acids are synthesized directly at the ribosomes by the hydrolysis of dietary protein.

B) Acetyl-CoA carries the amino acids that match the codon on DNA.

C) Amino transport proteins called lipoproteins bring the correct amino acids to the ribosomes.

D) Transfer RNA molecules whose anticodon loop contains the complementary sequence of an mRNA codon carry the amino acids.

E) Amino acids are carried in the interior of the DNA double helix, then carried to the ribosomes.

67.Which of the following correctly describes what occurs in the biological process of translation?

A) The two strands of the DNA double helix separate, and two new complementary strands are formed.

B) The genetic code of DNA is rewritten in mRNA, which leaves the nucleus and carries the information to the ribosomes.

C) The genetic code contained in mRNA is interpreted by tRNA, and the specific amino acids are brought to the ribosomes for protein synthesis.

D) Complementary base pairing between mRNA and the template strand of DNA occurs.

E) A new mRNA molecule is synthesized from the information contained in DNA.

68.Which of the following is NOT a component of a nucleotide?

A)nitrogenous base

B)five-carbon sugar

C)phosphoryl group

D)amino acid

E)A nucleotide consists of all of these components.

69.Which statement properly describes the difference between ribose and deoxyribose?

A)Ribose is an L-sugar and deoxyribose is a D-sugar.

B)Deoxyribose has one less oxygen atom than ribose.

C)Ribose has an ?-arrangement and deoxyribose has a ?-arrangement.

D)Ribose is a five-carbon sugar and deoxyribose is a six-carbon sugar.

E)Deoxyribose has two more hydroxyl groups than ribose.

70.A DNA template strand having the sequence shown below would produce an mRNA molecule with what sequence?

3’-CGATCA-5’

A) 3’-CGATCA-5’

B) 3’-CGAUCA-5’

C) 5’-CGAUCA-3’

D) 5’-GCUAGU-3’

E) 5’-GCTAGT-3’