Question: 14) sickle cell anemia is an inherited disease. It is caused by
one polar aminoacid (glutamate) i…
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
