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35 terms

Microbiology: Genetics Chapter 8 Exam 1

FSCJ Dr. Davis' Test banks for Microbiology
STUDY
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A linear sequence of DNA nucleotides which provides the genetic information for a single characteristic is a
C) gene
A permanent alteration in the DNA of an organism is called a/n
A) mutation
Which nitrogenous base is not normally found in DNA?
C) uracil
In DNA, the base adenine always pairs with what other base?
D) thymine
Replication results in the formation of what type of new molecule?
A) DNA
In RNA, uracil takes the place of which base normally found in DNA?
B) thymine
Transcription is the formation of ________ from a ________ template.
B) RNA, DNA
The process of ________ results in the synthesis of a new protein.
C) translation
Reverse transcription occurs when
A) RNA is used as a template to produce DNA
Reverse transcription takes place
B) in some viruses
During replication, DNA is synthesized by
A) DNA polymerase
During DNA replication
C) the lagging strand is synthesized in the 5' to 3' direction
RNA polymerase uses ________ as a template to synthesize ________ .
C) DNA, RNA
Regions of genes that do not code for a protein are called
B) introns
The information carried by DNA is used to create a ________ which then moves to the ribosome for protein synthesis.
D) mRNA
A mRNA molecule can be broken down into three nucleotide units called
C) codons
Amino acids move from the cytoplasm to the ribosome with the help of
B) tRNA's
An anticodon would be found in/on a ________ molecule.
B) tRNA
tRNA molecules serve as a link between
C) codons and amino acids
In eukaryotes, transcription takes place in the ________ while translation takes place in the ________.
B) nucleus, cytoplasm
Which of the following properties are exclusive to mRNA?
B) carries information from DNA for synthesis of a protein
Which of the following properties are exclusive to tRNA?
C) molecules contain an anticodon
Which of the following properties are exclusive to rRNA?
A) combines with specific proteins to form ribosomes
Bacteria are often used for the study of genetic regulatory mechanisms because
They can be grown in large numbers relatively inexpensively,They produce many new generations rapidly, A variety of mutations can be observed in a relatively short time (D) ALL OF THE ABOVE
Mutagens such as 5-bromouracil, a nitrogen base analog, cause mutations by
A) substituting for one of the bases normally found in DNA
T or F: Most bacterial cells have two chromosomes.
Answer: False
T or F: Transcription refers to the process of DNA synthesis.
Answer: False
T or F: Introns are segments of DNA that do not code for proteins.
Answer: True
T or F: mRNA is formed in the 3' to 5' direction.
Answer: False
T or F: An amino acid can be specified for by more than one codon.
Answer: True
DNA is used as a template to make new DNA during the process of ________.
Replication
DNA is used as a template to make RNA during the process of ________.
Transcription
A three base sequence called the ________ in tRNA binds with the ________ found in mRNA.
anticodon, codon
Induced mutations are produced by agents called ________ .
mutagens
DNA separates at ________ forks to allow the genetic information in the molecule to be duplicated.
replicate