Question : 41) In the enzyme induction model of cellular control,  A) : 1363067

 

41) In the enzyme induction model of cellular control, 

A) cofactors control protein synthesis.

B) the substrate controls protein synthesis.

C) the substrate combines with a protein to form a repressor.

D) the enzyme for the substrate is always synthesized by the gene.

E) the substrate represses the operator.

42) Small living particles, with 3 to 200 genes, that cannot replicate without a host cell are called

A) recombinant DNAs.

B) viruses.

C) bacteria.

D) tumors.

E) plasmids.

43) A virus that contains RNA as its genetic material is a

A) genetically engineered virus.

B) bacteria.

C) recombinant DNA.

D) retrovirus.

E) vaccine.

44) Protease inhibitors, which are effective anti-HIV drugs,

A) are nucleoside analogs.

B) prevent reverse transcription.

C) prevent synthesis of viral proteins.

D) prevent mRNA synthesis.

E) prevent activation of tRNA.

45) Some sections of a DNA molecule do not code for protein synthesis.  These segments are called

A) codons.

B) anticodons.

C) Okazaki fragments.

D) introns.

E) exons.

46) Guanine is one example of a nitrogen base that is a

A) cofactor.

B) 5-carbon sugar.

C) phosphodiester.

D) pyrimidine.

E) purine.

47) The two strands of the double helix of DNA are held together by

A) hydrogen bonds.

B) covalent bonds.

C) dipole-dipole interactions.

D) ionic bonds.

E) sugar-to-phosphate bonds.

48) A restriction enzyme functions to

A) prevent the DNA from leaving the nucleus.

B) limit the number of replications a DNA molecule can achieve.

C) cut a large DNA double helix into smaller fragments.

D) stop the elongation step of protein synthesis.

E) eliminate a virus from a cell.

49) When a mutation occurs by elimination of one base in a DNA sequence, this mutation is called a

A) frameshift mutation.

B) retrovirus insertion.

C) substitution mutation.

D) translocation mutation.

E) viral mutation.

50) In the study of genetics, the abbreviation PCR refers to

A) purine chain repression.

B) pyrimidine complement restriction.

C) purine coded ribose.

D) protein combination and replication.

E) polymerase chain reaction.

51) Recombinant DNA technology requires the use of bacterial

A) plasmids.

B) mitochondria.

C) endoplasmic reticulum.

D) ribosomes.

E) cell walls.

52) One therapeutic product now available due to recombinant DNA technology is

A) measles vaccine.

B) penicillin.

C) human growth hormone.

D) sulfamethoxazole.

E) tamoxifen.

53) DNA fingerprinting uses __________ to produce DNA fragments that can be separated and screened for the presence of genetic diseases.

A) extracellular DNA

B) restriction enzymes

C) bacterial plasmids

D) anticodons

E) codons

54) The purpose of the human genome project was to

A) identify genes responsible for noninheritable diseases.

B) determine how to clone human DNA.

C) identify substrates for the polymerase chain reaction.

D) learn how to clone bacterial DNA.

E) map the locations of all the genes in human DNA.

 

 

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