What is a ribozyme? A) an enzyme that uses RNA as a substrate B) an RNA with enz

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What is a ribozyme? A) an enzyme that uses RNA as a substrate B) an RNA with enzymatic activity C) an enzyme that catalyzes the association between the large and small ribosomal subunits D) an enzyme that synthesizes RNA as part of the transcription process E) an enzyme that synthesizes RNA primers during DNA replication Which enzyme was used to produce the molecule in Figure 201? A) ligase B) transcriptase C) a restriction enzyme D) RNA polymerase E) DNA polymerase Bacteria that do not take up any plasmids would grow on which media? A) the nutrient broth only B) the nutrient broth and the tetracycline broth C) the nutrient broth and the ampicillin broth D) the tetracycline broth and the ampicillin broth E) all three broths Which of the following DNA mutations is the most likely to be damaging to the protein it specifies? A) a base-pair deletion B) a substation in the last base of a codon C) a codon substitution D) a point mutation E) a codon deletion Which of the following is a protein produced by a regulatory gene? A) operon B) inducer C) promoter D) repressor E) corepressor A man with Klinefelter syndrome (47, XXY) is expected to have any of the following EXCEPT A) possible breast enlargement B) female body characteristics C) increased testosterone D) long limbs E) lower sperm count The lactose operon is likely to be transcribed when A) there is more glucose in the cell than lactose. B) the cyclic AMP levels are low. C) there is glucose but no lactose in the cell. D) the cyclic AMP and lactose levels are both high within the cell. E) the CAMP level is high and the lactose level is low. Which of the following separates molecules by movement due to size and electrical charge? A) gel electrophoresis B) reverse transcriptase C) gene cloning D) DNA ligase E) restricting enzymes Independent assortment of chromosomes occurs. A) The statement is true for mitosis and meiosis I. B) The statement is true for meiosis I only. C) The statement is true for mitosis only. D)The statement is true for mitosis and meiosis II. E) The statement is true for meiosis II only.

Explanation / Answer

40. B. an RNA molecule that has an enzymatic activity.

It is known as ribonucleic acid enzymes, They are capable of catalyzing biochemical reaction.

1.D  RNA polymerases

It synthesize DNA molecules from deoxyribonucleotides, the building blocks of DNA

42. A) the nutrient broth only

Bacteria containing a plasmid would grow in the ampicillin broth and the nutrient broth.

43.A codon deletion

when one codon deleted or lost from the DNA  results in a protein missing or damaging the protein.

44. D) repressor

45.c. Increased  testosterone

They have lower testosterone levels, which lead to less muscle, hair, and sexual interest.

46. D) the cyclic AMP and lactose levels are both high within the cell.

47 A. gel electrophoresis

It is  used to separate mixtures of DNA, RNA, or proteins according to molecular size.

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