Question 1

All of the following pertain to nitrogenous bases except _______.

Accepted Answer

A)   they form pairs by hydrogen bonding
B)   guanine pairs with uracil
C)   adenine pairs with thymine
D)   cytosine and thymine are pyrimidines
E)   they allow variation from one nucleotide to another which creates the encoded informationF) None of the above
G) B) and D)

Question 2

A sequence of bases within a gene that does not code for protein is called a/an _______.

Accepted Answer

A)   promoter
B)   operator
C)   operon
D)   exon
E)   intronF) B) and E)
G) B) and C)

Question 3

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) B) and C)
G) B) and E)

Question 4

Transcription occurs within the nucleus or at the nucleoid.

Accepted Answer

A) True 
 B)False

Question 5

DNA Polymerase I _______.

Accepted Answer

A)   removes primers
B)   adds bases to new DNA chain
C)   seals DNA gaps
D)   proofreads DNA chainE) B) and C)
F) A) and D)

Question 6

Hfr transfer involves all of the following except _______.

Accepted Answer

A)   gene integration into the bacterial chromosome
B)   independent plasmid transfer
C)   F factor is part of the F+ donor chromosome
D)   high frequency transfer
E)   a pilus connection between F+ and F- cellsF) B) and C)
G) C) and D)

Question 7

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False

Question 8

Base pairs in DNA are held together by ______ bonds.

Accepted Answer

A)   peptide
B)   nonpolar covalent
C)   polar covalent
D)   hydrogen
E)   sulfhydrylF) C) and E)
G) A) and E)

Question 9

RNA polymerase binds to the _______.

Accepted Answer

A)   start codon
B)   termination sequence
C)   regulation sequence
D)   promoter sequenceE) A) and B)
F) B) and D)

Question 10

Induced mutations are initiated by errors in DNA replication.

Accepted Answer

A) True 
 B)False

Question 11

The most serious type of mutation is a ______ mutation.

Accepted Answer

A)   point
B)   silent
C)   frameshift
D)   backE) C) and D)
F) A) and B)

Question 12

The three-base sequence on DNA that codes for an amino acid is called a/an ________.

Accepted Answer

A)   codon
B)   exon
C)   anticodon
D)   intron
E)   tripletF) A) and D)
G) B) and C)

Question 13

Replication of DNA begins at a/an _______ rich area.

Accepted Answer

A)   guanine-cytosine
B)   uracil-adenine
C)   adenine-thymine
D)   adenine-cytosine
E)   guanine-adenineF) None of the above
G) C) and D)

Question 14

The term 'recombinant organism' refers to _______.

Accepted Answer

A)   an organism that has recombined its genes
B)   an organism that has genes passed down from the parent cell to the daughter cells during binary ﬁssion
C)   an organism that expresses proteins coded for by genes that originated in a different organism
D)   genetically engineered cells, but not those that have new genes as a result of horizontal gene transferE) A) and B)
F) C) and D)

Question 15

Groups of three consecutive bases along the DNA of a gene have the code for one _______.

Accepted Answer

A)   protein
B)   nucleotide
C)   amino acid
D)   purineE) B) and D)
F) None of the above

Question 16

Which of the following is not a type of bacterial DNA recombination?

Accepted Answer

A)   Transformation
B)   Conjugation
C)   Mitosis
D)   TransductionE) A) and B)
F) C) and D)

Question 17

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the ________.

Accepted Answer

A)   promoter
B)   operator
C)   operon
D)   exon
E)   intronF) A) and E)
G) A) and D)

Question 18

Which of the following is incorrect about termination codons?

Accepted Answer

A)   They are also called nonsense codons.
B)   They are the location where the bond between the ﬁnal tRNA and the polypeptide is broken.
C)   They include AUG.
D)   They are UAA, UAG, and UGA.
E)   They do not have corresponding tRNA.F) B) and D)
G) D) and E)

Question 19

The mechanism of DNA synthesis differs between the two new daughter strands during replication. This is due to the fact that _______.

Accepted Answer

A)   both daughter strands can't extend toward the replication fork because there would not be room for two DNA polymerase enzymes
B)   the DNA strands run antiparallel to each other and the DNA polymerase can only add nucleotides to the 3' end of the growing strand
C)   both RNA primers attach to the 3' end of the template strands, which are at opposite ends from each other
D)   one RNA primer attaches to the 5' end of the parent strand and the other primer to the 3' endE) A) and C)
F) A) and D)

Question 20

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) A) and B)
G) C) and D)

Exam 9: Microbial Genetics

Base pairs in DNA are held together by ______ bonds.

Correct AnswerverifiedShow Answer

Which of the following is not a type of bacterial DNA recombination?

Correct AnswerverifiedShow Answer

The term 'recombinant organism' refers to _______.

Correct AnswerverifiedShow Answer

Which of the following is incorrect about termination codons?

Correct AnswerverifiedShow Answer

Induced mutations are initiated by errors in DNA replication.

Correct AnswerverifiedShow Answer

RNA polymerase binds to the _______.

Correct AnswerverifiedShow Answer

A sequence of bases within a gene that does not code for protein is called a/an _______.

Correct AnswerverifiedShow Answer

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the ________.

Correct AnswerverifiedShow Answer

The three-base sequence on DNA that codes for an amino acid is called a/an ________.

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

DNA Polymerase I _______.

Correct AnswerverifiedShow Answer

Replication of DNA begins at a/an _______ rich area.

Correct AnswerverifiedShow Answer

Hfr transfer involves all of the following except _______.

Correct AnswerverifiedShow Answer

Excised introns form structures called lariats.

Correct AnswerverifiedShow Answer

Transcription occurs within the nucleus or at the nucleoid.

Correct AnswerverifiedShow Answer

The mechanism of DNA synthesis differs between the two new daughter strands during replication. This is due to the fact that _______.

Correct AnswerverifiedShow Answer

Groups of three consecutive bases along the DNA of a gene have the code for one _______.

Correct AnswerverifiedShow Answer

Of the following list, which antibiotics affect protein synthesis?

Correct AnswerverifiedShow Answer

The most serious type of mutation is a ______ mutation.

Correct AnswerverifiedShow Answer

All of the following pertain to nitrogenous bases except _______.

Correct AnswerverifiedShow Answer

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