Question: Colorblindness is a sex-linked trait located in the X
chromosome. Which of the following couples …
colorblindness is a sex-linked trait located in the X
chromosome. Which of the following couples would have all normal
son, but the daughters will all be carrier? A) a color blind male
and a norml female B) a color blind male and femal who is
colorblind carier C) a normail male and female who is colorblind
carrier D) a male who is colorblind carrier and a colorblind female
E) a normal male and a colorblind female
2) Colorblindness is a sex- linked trait located in the X
chromosome. Which of the following couples would have all normal
sons, but the daughter will all be a carrier? A) A color blind male
and a normal female B) a color blind male and a female who is
colorblind carrier C) a normal male and a female who is colorblind
carrier D) a male who is colorblind carrier and a colorblind female
E) a normal male and a colorblind female
3) You see a recombination frequency of 50% between those genes.
Which of the following possibilities can you exclude? A) That the
gene are located close together on the same chromosome B) that the
genes are on different chromosome C) that the gene are assorting
independently D) that the gene are located on the same chromosome,
but very far apart
4) Testosterone is a lipophilic (hydrophobic) hormone release
during puberty. This is responsible of the long time changes that
we see happen during this developmental stage: facial and pubic
growth, increased muscle mass, and even undesired affects such as
acne. How is this testosterone producing such lasting affects? A)
It ultimately activated proteins already present in the cell B)
they cannot cross the plasma membrane, thus their receptor are
located extracellularly C) it uses activate transport in order to
move from high concentration in the blood to the low concentration
inside the cell D) it activated intracellular receptor that act as
transcription factor changing gene expression
Which of the following is false when comparing transcription
between prokaryotes and eukaryotes? A) Prokaryotes mRNA has
undergone multiple modification before translation B) eukaryotes
gene have introns that need to be removed before translation C)
Prokaryotes mRNA can be translated while it is still being
transcribed D) eukaryotes mRNA needs a 5’ cap and a 3’ tail to
prevent its degradation
5) In eukaryotes, modification to the structure of chromatin
(such as addition of methyl groups to the DNA sequence or addition
of acetyl groups to histone proteins) can increase or decrease the
level of transcription of that gene. Some of these modifications
can be passed by generation to generation. What is the name of this
process? A) Translation B) epigenetic C) enhancer expression D)
promoter expressed E) operator suppression
6) You identified unique human protein that could help cure
Alzheimer disease. In order to mass-produce this protein, you want
to transform bacteria with this human gene. Which of the following
challenges you must address? A) The genetic code has different
codons between prokaryotes and eukaryotes B) human DNA contains
introns but bacteria do not splicing C) there is no technology
available yet to insert any gene into a bacterium D) prokaryotes do
not have ribosomes to do translation
7) Mrs., and Mr. Smith have widow peaks (dominant). Their first
child also has widows peak, but their second child doesn’t. Mr.
Smith accuses Mrs. Smith of being unfaithful to him. Is he
necessarily justified? A) Yes, the father couldn’t have had widows
peak B) Yes, Mr. Smith is homozygous dominant C) Yes, Mrs. And Mr.
Smith could both be homozygous dominant D) No, Mrs. Smith could be
homozygous recessive E) No, Mrs and Mr smith could both be
heterozygous
8) During what phase of cell division do you expect to see the
homologous chromosome attached to each other, exchanging DNA
segments with each other? A) anaphase in meiosis 1 B) prophase in
meiosis 2 C) prophase in meiosis 2 D_ anaphase in meiosis 2 E)
metaphase meiosis 2Which of the following is false when comparing
transcription between prokaryotes and eukaryotes? A) Prokaryotes
mRNA has undergone multiple modification before translation B)
eukaryotes gene have introns that need to be removed before
translation C) Prokaryotes mRNA can be translated while it is still
being transcribed D) eukaryotes mRNA needs a 5’ cap and a 3’ tail
to prevent its degradation
10) How do you predict the level of expression of the Lac operon
will be when lactose is absent? A) low because the cell doesn’t
need energy B) high because the cell need to produce lactose so it
can enter into glycolysis C) low because there is no lactose to
breakdown so there in no need to produce the enzymes D) high
because the repressor proteins will be removed from the operator
region in the DNA
11) liver cells, mammary cells and skin cells contain the same
genome; however, their respective preteomes (all the proteins found
in a cell) vary drastically. This observation is BEST explained by
what phenomenon? A) mitosis B) crossing over C) gene expression
regulation D) genetic variation E) mutations
12) which of the following statement about operons is true? They
allow individual regulations of each individual gene in the operon
B) they are complex gene structure present in eukaryotes C) all
gene of the operon will be expressed at the same time D) their
expression cannot be regulated at the same time E) they are being
transcribed constantly
13 when is the only time that cells do not carry out
transcription? A) every time the cells need enzymes to do any
metabolic process B) only when the cell need to produce a special
secretion or product, for example when you eat a meal and cells in
the stomach need to secrete trypsin enzyme for digestion C) when
the cell is dividing by either mitosis or meiosis D) every time the
cells needs to make new protein to perform any function in the cell
E) evey time current enzymes and proteins get broken down and need
to be replaced
14) sickle cell anemia is an inherited disease. It is caused by
one polar aminoacid (glutamate) in the hemoglobin protein being
replaced by a non-polar aminoacid (valine) changing the structure
and this the function of the protein. Which of the following
mutations is A) a mutation in the non-coding regions of the DNA
that are not transcribed B) a nucleotide substitution that change
the codon but not aminoacid coded C) a nucleotide substitution that
changes the amino coded for an aminoacid of similar properties D)
the deletion of the promoter region E) a nucleotide substitution
that changes the aminoacid coded for an aminoacid of different
properties
15) which of the following mechanism regulating gene expression
are available to bot: eukaryotes and prokaryotes? A) RNA
degradation following the normal of the poly-A-tail and the 5-cap
B) A single promotes regulating the expression of several genes in
the operon C) activators proteins promoting the attachment of RNA
polymerase to initiate transcription D) preventing specific RNA
transcription from leaving the nucleus and thus being translated E)
differential splicing of the RNA transcript resulting in the
translation of different peptides
16) the genetic code is read in groups of three (3) nucleotide
called codons. Some mutations are called silent because they have
no effect on the phenotype. How is that possible? A) Since there
was a mutation in one of the codons, that gene will not be
expressed B) it is not possible, mutations are always expressed and
always have an effect C) the mutation changed the codon but the new
codon codes for the same aminoacid D) the ribosome knows there was
a mutation and will put the correct aminoacid in place
17) In cats, short is dominant to long hair. A true-breeding
(homozygous) short- haired male is mated to a long- haired female.
What will their kittens look like? A) All will have short hair B) ¾
will have short hair and ¼ will have long hair C) half will have
short hair and will have long hair D) ¼ will short hair, ¼ will
have long hair and half will be of intermediate size E) all will
have long hair
18) meiosis contributes to genetic diversity: A) reducing the
number of chromosomes for karyogamy (fusion of niclei) with another
gamete B) recombining homologous chromosome during crossing over C)
random orientation of homologous chromosomes during anaphase 1 D)
random orientation of recombinant chromatid during metaphase 2
19) what can you conclude about the genes for pod shape and
plant height (compare observed rations in the diagram)? A) the gene
pod shape and plant height are located on different chromosomes B)
the gene for pod shape and plant height are located very close on
the same chromosome C) the gene pod shape and plant height are
located far apart on the same chromosome D) the gene for pod shape
and plant height assort independently
