NEW
Font size
WorksheetsMicrobial Genetics
Total questions: 30
Worksheet time: 15mins
RNA polymerase binds to the
start codon
promoter sequence
regulation sequence
termination sequence
A sequence of bases within a gene that will be transcribed, but removed from the transcript prior to translation is a/an
promotor
exon
intron
operon
Helicase
winds RNA
unwinds DNA
supercoils DNA
unwinds RNA
Genes that jump from one location to another in the genome are
repressors
transformers
operons
transposons
The non-transcribed region of DNA to which RNA polymerase binds to initiate transcription is called the
operator
exon
promotor
operon
What molecule is synthesized as a copy of a gene from the DNA template strand?
primer RNA
transfer RNA
ribosomal RNA
messenger RNA
A screening system called the _____ test is used for detecting chemicals with carcinogenic potential.
mutation
Ames
Iowa
Koch
Which of the following antibiotics affect protein synthesis?
chloramphenicol
tetracycline
penicillin
both chloramphenicol and tetracycline
A nucleosome is a linear chromosome wound around the
mRNA
rRNA
histone
nucleolus
Which of the following is not a type of bacterial DNA recombination?
transformation
transduction
mitosis
conjugation
Each nucleotide is composed of
two phosphates, one nitrogenous base, two sugars
one phosphate, one nitrogenous base, two sugars
one phosphate, one nitrogenous base, one sugar
two phosphates, one nitrogenous base, one sugar
Which of the following is incorrect about transfer RNA?
Initiator tRNA in bacteria carries tryptophan
has a bottom hairpin loop with an anticodon
contains a binding site for an amino acid
The initiator tRNA that binds to the P site has the anticodon UAC
The site where the old DNA strands separate and new DNA strands will be synthesized is called the
primer
Okazaki fragment
replication fork
template
A permanent, inheritable change in the genetic information is called a(n)
translation
transcription
regeneration
mutation
Semiconservative replication refers to
a purine always binding to a pyrimidine
an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction
each base bonding at the 1' position of the sugar
Synthesis of a repressible enzyme is inhibited by
a substrate bound to promotor
corepressor and repressor binding to operator
repressor alone bound to operator
substrate bound to repressor
The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is
DNA helicase
DNA gyrase
primase
DNA polymerase
Base pairs in DNA are held together by ____ bonds.
nonpolar covalent
peptide
polar covalent
hydrogen
The expression of genetic traits is the
phenotype
genotype
genome
proteotype
All of the following pertain to nitrogenous bases except
they form pairs by hydrogen bonding
guanine pairs with uracil
cytosine and thymine are pyrimidines
they allow variation from one nucleotide to another which creates the encoded information.
The enzyme that proofreads replicating DNA, detects incorrect bases, excises them, and correctly repairs them is
DNA polymerase
DNA ligase
DNA helicase
DNA gyrase
What type of mutation alters the base, but not the amino acid being coded for?
point
missense
silent
back
RNA molecules differ from DNA molecules because only RNA
has ribose
does not have thymine
has uracil
All of these choices are correct
Structural genes code for
ribosomal RNA molecules
gene expression elements
transfer RNA molecules
cellular proteins
The gene of an operon that codes for a protein repressor is called the
promotor
regulator
operator
structural locus
The different types of nucleic acids found in viruses include all of the following except
single-stranded RNA
double-stranded RNA
double-stranded DNA
single-stranded DNA
The development of virulent, toxin-producing bacterial strains due to the presence of a temperate phage can occur in
bacterial conjugation
specialized transduction
generalized transduction
transformation
Replication of DNA begins at a(n)
adenine-cytosine rich area
uracil-adenine rich area
guanine-adenine rich area
adenine-thymine rich area
The most damaging type of mutation is a
back mutation
frameshift mutation
silent mutation
point mutation
If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATA ETH EBI GRA T?
missense
insertion
deletion
nonsense
