Question 1

The transfer of DNA fragments from a dead cell to a live,competent recipient cell that results in a changed recipient cell is termed ________.

Accepted Answer

A)   transduction
B)   conjugation
C)   transformation
D)   transmission
E)   mitosisF) C) and D)
G) D) and E)

Question 2

Induced mutations are initiated by errors in DNA replication.

Accepted Answer

A) True 
 B)False

Question 3

The smallest unit of heredity is a chromosome.

Accepted Answer

A) True 
 B)False

Question 4

The expression of genetic traits is referred to as the organism's ______.

Accepted Answer

A)   genome
B)   genotype
C)   proteome
D)   phenotype
E)   proteotypeF) B) and E)
G) A) and B)

Question 5

In Griffith's experiments with Streptococcus pneumoniae,rough nonencapsulated streptococci were converted into smooth encapsulated streptococci in the presence of the heat-killed smooth encapsulated streptococci.Which microbial process had Griffith identified?

Accepted Answer

A)   Transduction
B)   Conjugation
C)   Transformation
D)   CloningE) B) and C)
F) None of the above

Question 6

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False

Question 7

Which molecule is translated into an amino acid sequence?

Accepted Answer

A)   Ribosomal RNA
B)   Messenger RNA
C)   Transfer RNA
D)   Primer RNA
E)   RibozymesF) B) and E)
G) A) and E)

Question 8

DNA polymerase can catalyze a dehydration synthesis reaction only at the 3'carbon of the daughter strand of DNA. This means that

Accepted Answer

A)  	the antiparallel nature of the parent molecules determine that the leading strand must be grown in fragments away from the fork and the lagging strand is synthesized continuously toward the fork.
B)  	the leading and lagging strands extend in the 3'- 5'direction toward the replication fork as the nucleotide bases are exposed.
C)  	Okazaki fragments extend toward the replication fork as the parent strands are unzipped by helicase.
D)  	since the strands are antiparallel, one strand will grow toward the fork as it opens, and the other strand will grow in fragments away from the fork.E) A) and B)
F) A) and C)

Question 9

Full induction of the lactose operon requires

Accepted Answer

A)   lactose present.
B)   lactose and glucose present.
C)   lactose present without glucose.
D)   lactose and arabinose present.E) A) and C)
F) None of the above

Question 10

The antiparallel arrangement within DNA molecules refers to

Accepted Answer

A)   each base bonding at the 1'position of the sugar.
B)   a purine always bonding to a pyrimidine.
C)   one helix strand that runs from the 5'to 3'direction and the other strand runs from the 3'to 5'direction.
D)   an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.E) All of the above
F) A) and C)

Question 11

Of the following list,which antibiotics affect protein synthesis?

Accepted Answer

A)   Penicillin
B)   Tetracycline
C)   Chloramphenicol
D)   Ciprofloxacin
E)   Both tetracycline and chloramphenicol are correct.F) B) and E)
G) B) and D)

Question 12

The lactose repressor

Accepted Answer

A)   is transcribed with the structural lac genes.
B)   is activated by binding lactose.
C)   is inactivated by binding lactose.
D)   requires lactose for its transcription.E) A) and B)
F) B) and C)

Question 13

The jumping of a gene from one location to another is done by ________.

Accepted Answer

A)   conjugation
B)   transposons
C)   transformation
D)   transduction
E)   transmissionF) A) and D)
G) B) and D)

Question 14

Which is incorrect about purines?

Accepted Answer

A)   They are only found in DNA, not in RNA.
B)   They are nitrogenous bases.
C)   They are always paired with a specific pyrimidine.
D)   They include adenine and guanine.
E)   They are found within nucleotides.F) C) and E)
G) All of the above

Question 15

Which of the following is not true of conjugation?

Accepted Answer

A)   Involves direct contact between cells
B)   Transfers genes for drug resistance
C)   Transfers genes for enzymes and adherence molecules
D)   Involves the action of bacteriophage
E)   The donor retains a copy of the transferred genesF) C) and D)
G) All of the above

Question 16

The fields of genomics and proteomics differ in that

Accepted Answer

A)   the field of genomics involves the study of DNA replication and the field of proteomics refers to the study of transcription and translation.
B)   genomics refers to the study of an organism's entire genome, whereas proteomics is the study of expressed proteins.
C)   genomics is the study of an organism's chromosomes and the resulting proteins are studied in the field of proteomics.
D)   genomics is the study of an organism's chromosomes and proteomics is the study of transcription and translation of proteins.E) A) and B)
F) None of the above

Question 17

Repressible operons are normally turned on in the cell.

Accepted Answer

A) True 
 B)False

Question 18

A ______ is a specific segment of DNA that codes for the production of one functional product.

Accepted Answer

A)   intron
B)   exon
C)   gene
D)   operator
E)   tripletF) A) and B)
G) A) and C)

Question 19

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT,what type of mutation would change the sequence to THE CAT ATE (stop) ?

Accepted Answer

A)   Missense
B)   Nonsense
C)   Insertion
D)   Deletion
E)   SilentF) A) and E)
G) All of the above

Question 20

Transcription occurs within the nucleus or at the nucleoid.

Accepted Answer

A) True 
 B)False

Exam 9: Microbial Genetics

Repressible operons are normally turned on in the cell.

Correct AnswerverifiedShow Answer

Excised introns form structures called lariats.

Correct AnswerverifiedShow Answer

A ______ is a specific segment of DNA that codes for the production of one functional product.

Correct AnswerverifiedShow Answer

Of the following list,which antibiotics affect protein synthesis?

Correct AnswerverifiedShow Answer

Full induction of the lactose operon requires

Correct AnswerverifiedShow Answer

The antiparallel arrangement within DNA molecules refers to

Correct AnswerverifiedShow Answer

Induced mutations are initiated by errors in DNA replication.

Correct AnswerverifiedShow Answer

The fields of genomics and proteomics differ in that

Correct AnswerverifiedShow Answer

The expression of genetic traits is referred to as the organism's ______.

Correct AnswerverifiedShow Answer

The lactose repressor

Correct AnswerverifiedShow Answer

The smallest unit of heredity is a chromosome.

Correct AnswerverifiedShow Answer

In Griffith's experiments with Streptococcus pneumoniae,rough nonencapsulated streptococci were converted into smooth encapsulated streptococci in the presence of the heat-killed smooth encapsulated streptococci.Which microbial process had Griffith identified?

Correct AnswerverifiedShow Answer

Which molecule is translated into an amino acid sequence?

Correct AnswerverifiedShow Answer

Which is incorrect about purines?

Correct AnswerverifiedShow Answer

Transcription occurs within the nucleus or at the nucleoid.

Correct AnswerverifiedShow Answer

The jumping of a gene from one location to another is done by ________.

Correct AnswerverifiedShow Answer

DNA polymerase can catalyze a dehydration synthesis reaction only at the 3'carbon of the daughter strand of DNA. This means that

Correct AnswerverifiedShow Answer

The transfer of DNA fragments from a dead cell to a live,competent recipient cell that results in a changed recipient cell is termed ________.

Correct AnswerverifiedShow Answer

Which of the following is not true of conjugation?

Correct AnswerverifiedShow Answer

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT,what type of mutation would change the sequence to THE CAT ATE (stop) ?

Correct AnswerverifiedShow Answer

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