somEonE gave me wrong answers, please answer MUTLIPLE CHOICE QUESTIONS, 3000 POI
ID: 69676 • Letter: S
Question
somEonE gave me wrong answers, please answer MUTLIPLE CHOICE QUESTIONS, 3000 POINTS
1.Two of the many genes responsible for eye colour in humans show complementation.For these two genes M and N, one brown-eyed parent is gnotyp MmNn, and the other brwon-eyed parent is MMNn. What is the expected number of blue-eyed children in 16 births?
a.9 brown:7 blue
b.9 blue: 7 brown
c.12 brown:4 blue
d.13 brown: 3 blue
e.8 brown: 8 blue
2.Individuals having one complete set of chromosomes in addition to the nromal diploid complement, are termed:
a.tetraploid
b.aneuploid
c.triploid
d.trisomic
e.none of the above
3.A species has 2n=16 chromosomes.How many chromosomes would be found in a monosomic somatic cell, a trisomic somatic cell, and a normal germ cell, respectively?
a.8,8,17
b.15,17,8
c.15,17,8
d.8,17,8
e.8,17,16
4.A Drosophila gynandromorph, in which one half of th fly is male and the other half is female, results from:
a.chromosome loss during first meiotic division
b.chromosom loss during the second meitoic division
c.chromosome loss during thr first mitotic division floowing fertilization
d.fertilization with a gamete containing two Y chromosomes
e.none of the above
5.The probability of anuploidy offspring is greatest for:
a.nondisjunction in meiosis I
b.nondisjunction in meiosis II
c.nondisjunction in meiosis I and II
d.nondisjunction in mitosis
e.all of th above commonly caus aneuploidy
6.In the cross vg b^+ pr^+/vg^+b pr x vg b pr/vg b pr, whre all three genes ar linked, and pr in the middle gene, whcih on of the following phenotypic classes would be expectd to have th smallest numbers of offsprings?
a.vg b pr
b.vg^+ b pr
c.vg^+ b^+ pr^+
d.vg b pr^+
e.vg b^+ pr
7.Promoters in genes are:
a.present in mRNA and th gene
b.present in the gene, but not the mRNA
c.transcribed and translated0
d.the start of translation signal in gnes
e.transcribed in prokaryotes but not eukaryots
8.What is the sequnce transcribed from the coding strand (RNA-lik strand) shown blow?
5' GTAACTATAATTAACGTAAGACTAT3'
a.5'GUAACUAUAAUUAACG.......
B.5'CAUUGAUAUUAAUUCG......
C.5'UAUCAGAAUGCAAUUA......
D.5'CAUUCUG........
E.5'GUAAGAC........
9.Which of the following are encoded by genes?
a.mRNA
b.protiens
c.tRNA
d.ribosomal RNA
e.all of the above
10.Within the first 40 bass of coding sequence (open reading frame) of a gene specifying a 300 amino acid protein E.coli, whcih combination of mutation is the LEAST LIKELY to result in a mutant phenotype?
a.one single basepair insertion
b.one single basepair deletion
c.a two basepair deletion
d.one single basepair deletion and two single basepair insertions in the same region
e.two single basepair deleltion and two singl basepair insertions in the same region.
11.A change from the codon AGG TO CGG is bst described as a likely __________mutations
a.silent
b.nonsense
c.missense
d.replacement
e.transition
12.A tRNA anticodon is 5'ACG 3'.It can bind which of the following codons?
a.5'AGC
B.5'CGG
C.5'UGC
D.5'CGU
E.a and c only
13.The shine-Dalgarno sequence is :
a.needed for transcription in prokaryotes
b.needed for the transltion inprokaryotes
c.needed for transcription in eukaryotes
d.needed for translation
e.needed for DNA replication
14.The Shrine-Dalgarno sequence is recognizd by:
a.RNA polymerase
b.sigma factor
c.the 18S rRNA of the large subunit of the ribosome
d.a tRNA carrying n-formyl methionine
e.the 16S rRNA of the small subunit of th ribosome
14.Th small subunit of eukaryotic ribosoms recognize and bind to:
a.the Shine -Dalgarno sequence of the mRNA
b.the TATA box
c.the 5'cap of the mRNA
d.the AUG of the mRNA
.the sigma factor and tRNA
15.What is the purpos of th pptidyl transferase function in ribosomes?
a.it chrages tRNAs
b.it acetylates the nd of a protein after translation
c.it claves th polypeptide from the last tRNA during termination
d.it moves ribosomes along mRNA during translation
e.it forms pptide bonds
16.Glutamine is coded for by just two codons, CAA and CAG.The best explanation as to how this segeneracy occurs is:
a.two different tRNAs must be used
b.wobble in the 5' position of the anitcodon allows a single tRNA to bind to both codons
c.wobble in the 3' position of the anticodon allows a single tRNA to bind to both codons
d.glutamin is carried by more than one tRNA.
e.an organsim will use one codon or the other, but not both
Explanation / Answer
1.
c.12 brown:4 blue
MN
Mn
MN
Mn
MN
MMNN
MMNn
MMNN
MMNn
Mn
MMNn
MMnn
(blue)
MMNn
MMnn
(blue)
mN
MmNN
MmNn
MmNN
MmNn
mn
MmNn
Mmnn
(blue)
MmNn
Mmnn
(blue)
2.
c.triploid
3.
b.15,17,8 9
(2n1 is called monosomic (meaning “one chromosome”) because only one copy of some specific chromosome is present instead of the usual two found in its diploid progenitor. The aneuploid 2n+1 is called trisomic. Gametes have 'n' chromosomes i.e. half of normal somatic cell.)
4.
c.chromosome loss during thr first mitotic division floowing fertilization.
5.
a.nondisjunction in meiosis I
6.
e.vg b^+ pr
7.
b.present in the gene, but not the mRNA
8.
a.5'GUAACUAUAAUUAACG.......
9.
e.all of the above
10.
e.two single basepair deleltion and two singl basepair insertions in the same region.
11.
a.silent
12.
D.5'CGU
13.
b.needed for the transltion inprokaryotes
14.
e.the 16S rRNA of the small subunit of th ribosome
14.
c.the 5'cap of the mRNA
15.
e.it forms pptide bonds
16.
b.wobble in the 5' position of the anitcodon allows a single tRNA to bind to both codons
MN
Mn
MN
Mn
MN
MMNN
MMNn
MMNN
MMNn
Mn
MMNn
MMnn
(blue)
MMNn
MMnn
(blue)
mN
MmNN
MmNn
MmNN
MmNn
mn
MmNn
Mmnn
(blue)
MmNn
Mmnn
(blue)
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