One category of a virus is the retroviruses, like HIV,
which means
They use reverse transcriptase to make DNA
copies of their RNA
If a virus has an envelope, it is usually made out of:
Membrane taken from host cells
In the LYTIC cycle of bacteriophages –
Host DNA is degraded
what would result in greater activity
of the enzymes in a
metabolic pathway?
Lower levels of ubiquitin
In eukaryotic cells, the addition of ____ groups to
chromatin is
correlated with increased transcription
rates
Acetyl
In eukaryotic cells, the signal that often tells the
machinery
to degrade a protein is:
The attaching of ubiquitin to the protein.
If an operon is under positive repressible regulation:
It is normally transcribing and removing an
activator turns it off.
If a single base pair mutation in the DNA changes the
mRNA, but
there is no change in the amino acid that
is coded for, it is
considered a ____ mutation
Silent
What is a polyribosome?
An mRNA being translated by more than one
ribosome at a time
What would happen if a cell was missing SRP?
Ribosomes could not be attached to the
endoplasmic reticulum.
How is transcription terminated in eukaryotic cells?
Proteins cut the RNA free from the RNA
polymerase II
The P site of the ribosome usually holds
A tRNA with a polypeptide attached to it
Transcription in eukaryotes begins when transcription
factors
attach to:
A TATA box in the promoter region
During the copying of DNA, what action happens
first?
DNA Helicase attaches at a site of origin
_____ is the process that makes new copies of DNA
molecules.
Replication
Primers are synthesized where on the lagging strand?
At the beginning of every Okazaki fragment
What is the job of DNA polymerase I in the process
of DNA replication?
Replacing RNA primers with DNA
nucleotides
The figure above shows an example of a chromosomal
inversion
If homologous chromosomes fail to separate during
Meiosis I, it
results in _____ and an abnormal number
of chromosomes may occur
in the gamete.
Nondisjunction
What is polygenic Inheritance?
When multiple genes contribute to the
phenotype of a single character.
What is the probability that an AABBCC x AaBbCc
cross will
produce an AaBbCc offspring (assuming
independent assortment of
all gene pairs)
1/8
In tigers, the absence of fur pigmentation is caused by
a
recessive allele that also causes the tigers to be
crosseyed.
This is an example of:
A) Pleiotropy
B) Epistasis
C) Polygenic
inheritance
D) Incomplete dominance
E) Codominance
A) Pleiotropy
During gamete formation the segregation of the alleles
of one
gene is independent of the segregation of the
alleles of another
gene. What did Mendel call this
phenomenon?
Law of independent assortment
What is the probability of Aabb x aaBb parents
producing a child
who is homozygous recessive for at
least one of the genes?
3/4