BIOL 133 Week 3 Exam | Assignment Help | APUS
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BIOL 133 Week 3 Exam | Assignment Help | APUS
Week 3 Exam
Question 1 of 40
Why are hydrogen bonds holding DNA bases together
instead of covalent bonds?
o
enzymes cannot break covalent bonds
o
hydrogen bonds are stronger than covalent
bonds
o
hydrogen bonds are easier to break
allowing for DNA copying
o
covalent bonds cannot attach purines and
pyrimidines
Question 2 of 40
The part of the gene that is designated as +1 is also
known as
o
the start codon
o
the initiation site
o
the nontemplate strand
o
rho-dependent termination
Question 3 of 40
To determine the order of genes on a chromosome, one
can perform a
o
two point cross
o
punnet square
o
three point cross
o
karyotype
o
test cross
o
ideogram
Question 4 of 40
What is a major difference between DNA polymerase I
and DNA polymerase III?
o
DNA polymerase I synthesizes DNA on
leading strands and DNA polymerase III synthesizes DNA on lagging strands
o
DNA polymerase I synthesizes DNA on
lagging strands and DNA polymerase III synthesizes DNA on leading strands
o
DNA polymerase I repairs DNA and DNA
polymerase III synthesizes DNA in the 3׳ to 5׳ direction
o
DNA polymerase I synthesizes DNA in the 5׳
to 3׳ direction and DNA polymerase III synthesizes on lagging strands
Question 5 of 40
The type(s) of RNA that are directly involved in
translation are which of the following. Select all that apply
o
mRNA
o
rRNA
o
siRNA
o
tRNA
Question 6 of 40
For her science fair project, your little sister
replicated one of Mendel’s experiments. From a P0 pea plant with purple flowers
and a pea plant with white flowers, she got 1 purple F1 hybrid (she had
forgotten to water, so just one survived). From this self-fertilized F1 she got
8 F2 offspring. 7 were purple and 1 was white, for a 7:1 ratio.
Did your little sister just disprove Mendel’s laws?
o
Yes. This, and other examples of
non-Mendelian genetics demonstrate that Mendel’s Laws are actually incorrect
and misleading.
o
No. When another pea pod forms on the
plant, that will bring the numbers up to the correct 9:3, or 3:1 ratio
o
No. Dehydrating the parent caused
Lamarckian selection on the offspring.
o
No. Random chance can cause deviations in
the ratio of small numbers of progeny.
What does a spliceosome remove from pre-mRNA during
the process of splicing?
o
introns
o
exons
o
splices
o
7-methlyguanosine
o
poly-A tail
Question 8 of 40
Luckily for Mendel, all traits follow “Mendelian”
genetics.
o
True
o
False
Nondisjunction during meiosis I will result in
________.
o
n
o
n-1
o
n+1
o
n+1 and n-1
o
n, n-1, and n+1
Question 10 of 40
The most common time individual assortment occurs is
when genes are ________?
o
unlinked
o
linked
o
on non-sister chromatids of homologues
o
close together
Question 11 of 40
o
alanine
o
methionine
o
tryptophan
o
leucine
Question 12 of 40
What best describes the human karyotype?
o
42 pairs of autosomes
o
one pair of sex chromosomes and 23 pairs
of autosomes
o
X chromosomes and 22 pairs of autosomes
o
One pair of sex chromosomes and 22 pairs
of autosomes
Question 13 of 40
________ found in the -10 sequence makes it easier for
the DNA to separate.
o
G-C base pairs
o
Template strands
o
Non-template strands
o
A-T base pairs
o
Start codons
Question 14 of 40
A karyogram that contains 23 pairs of chromosomes with
a different pair for the 23rd pair would describe a(n
o
autosomal pair
o
male
o
female
o
disorder
There are a number of unique features to eukaryotic
pre-mRNA splicing. Select all that apply.
o
Introns are thought to encode specific
subunits of proteins.
o
Introns likely slow down gene expression.
o
Introns need to be removed precisely to
prevent mutations.
o
There are often multiple introns in a
gene.
Question 16 of 40
An organism with nonfunctioning telomerase
o
would be unaffected
o
cannot replicate DNA and RNA
o
would have shorten chromosomes earlier
than normal cells
o
would be unable to synthesize proteins
o
would be unable to go through mitosis
Question 17 of 40
The allele for widows peak (H) is dominant for the
allele for no widows peak (h). At a different gene locus, the allele for
hitchhikers thumb (D) is dominant to the allele for non-hitchhikers thumb (d).
A man is heterozygote for the traits and marries a woman who has no widows peak
and is heterozygote for hitchhikers thumb. What is the man’s genotype?
o
HHDD
o
HhDd
o
HHdd
o
hhDD
o
hhdd
Question 18 of 40
The codon AUG specifies the amino acid methionine.
What would the tRNA anitcodon be that recognizes this codon?
o
UAC
o
GUA
o
AUG
o
GCA
Question 19 of 40
In co-dominant traits, what is the phenotypic ratio
when two heterozygotes cross?
o
1:2:1
o
3:1
o
2:2 (1:1)
o
1:3
o
4:0
Question 20 of 40
In a monohybrid cross, of the offspring would be what
genotypes? Select all that apply.
o
Homozygous recessive
o
Homozygous dominant
o
Heterozygotes
o
Homozygous recessives
o
Homozygous dominants
o
Heterozygote
Question 21 of 40
Combination of alleles that independently assort is
usually higher than the number of chromosomes because
o
gene linkage
o
translocation
o
segregation
o
crossing over
o
jumping genes
Question 22 of 40
Your labmate’s ligation reaction didn’t work. The
regular ATP had run out, so he fueled the reaction with dATP from the PCR kit.
What advice can you give him?
o
Suggest trying one of the other
nucleotides from the PCR kit to drive the ligation reaction.
o
Suggest adding all four nucleotides from
the PCR kit.
o
Add heat to the ligation reactions to
provide energy, instead of ATP.
o
Remind Sam that dATP is not the same as
ATP.
Question 23 of 40
If a DNA sample from an unknown organism has
telomerase, the organism
o
Is prokaryotic
o
Is eukaryotic
o
Is bacteria
o
Has circular DNA
o
Will have a single origin of replication
What type of enzyme cuts the pre-mRNA between the
AAUAAA consensus sequence and a GU-rich sequence?
o
exonuclease
o
cleavase
o
endonuclease
o
sequenase
Question 25 of 40
What is the process of ribosomes making proteins?
o
translation
o
replication
o
transcription
o
mutation
Question 26 of 40
What is the correct order of DNA compaction in
eukaryotes?
o
Helix, chromatin fiber, nucleosomes,
duplicated chromosome, condensation of chromatin
o
Condensation of chromatin, nucleosomes,
chromatin fiber, helix, duplicated chromosome
o
Chromatin fiber, condensation of
chromatin, duplicated chromosome, nucleosome, helix
o
Helix, nucleosome, chromatin fiber,
condensation of chromatin, duplicated chromosome
A child contains what proportion of their parent’s
genetic makeup?
o
40:60
o
33:67
o
50:50
o
25:75
Question 28 of 40
If genes are completely linked, all the offspring will
be _________.
o
parental
o
recessive
o
hybrids
o
dominant
o
recombinants
Question 29 of 40
Low pitched male voices (RR) and a high pitched male
voice (rr). Heterozygotes have a baritone voice. This is an example of
_________.
A. incomplete
dominance
B. codominance
C. Mendelian
genetics (dominance and recessive
D. multiple
alleles
Question 30 of 40
Prokaryotes are able to perform transcription and
translation at the same time because they lack
o
a nucleus
o
a plasma membrane
o
transcription bubbles
o
plasmids
o
ribosomes
Question 31 of 40
Your study partner is confused. “I thought Watson and
Crick discovered genes – who are all these other people?”
Help out by matching each discovery with the
scientist(s) who made it.
o
Punnett
o
Morgan
o
Sutton and Boveri
o
Watson and Crick
o
Mendel
1. Traits arise from discrete units that remain
unchanged even when not exhibited. ________
2. Genes are carried on chromosomes. ________
3. Genes nearby on a chromosomes are linked, but can
become unlinked by recombination. ________
4. DNA has a double helical structure. ________
5. Developed a technique for predicting the outcome of
crosses. ________
Some scientists have proposed that the earliest forms
of life may have existed in an “RNA World” where RNA was both the genetic
material and responsible for enzymatic activity. Imagine that you have
recreated such a life form. What would demonstrate that RNA, but not protein or
DNA, is necessary and sufficient for these functions?
o
The organism lives and replicates despite RNase
and DNase treatment, but the organism dies when treated with protease.
o
The organism lives and replicates despite
protease and DNase treatment, but the organism dies when treated with RNase.
o
The organism lives and replicates despite
protease treatment, but the organism dies when treated with DNase and RNase.
o
The organism lives and replicates despite
DNase treatment, but the organism dies when treated with RNase and protease.
Question 33 of 40
The fourth codon has a mutation changing a UAC to a
UAG. What effect will this have on the protein?
o
None due to the degeneracy of the code
o
It wouldn't be made due to coding for a
nonsense codon
o
None due to the universality of the code
o
It would be made since there would no
longer be a start codon.
Question 34 of 40
What is a major difference between DNA polymerase I
and DNA polymerase III?
o
DNA polymerase I synthesizes DNA on
leading strands and DNA polymerase III synthesizes DNA on lagging strands
o
DNA polymerase I synthesizes DNA on
lagging strands and DNA polymerase III synthesizes DNA on leading strands
o
DNA polymerase I repairs DNA and DNA
polymerase III synthesizes DNA in the 3׳ to 5׳ direction
o
DNA polymerase I synthesizes DNA in the 5׳
to 3׳ direction and DNA polymerase III synthesizes on lagging strands
Question 35 of 40
How can an UV induced mutation affect DNA?
o
Creating guanine dimers between guanines
next to each other
o
Creating cytosine dimers between cytosines
next to each other
o
Creating adenine dimers between adenines
next to each other
o
Creating thymine dimers between thymines
next to each other
Question 36 of 40
________ unwinds the helix during replication.
o
DNA primase
o
DNA polymerase I
o
DNA gyrase
o
DNA ligase
o
E. DNA helicase
Question 37 of 40
Serious disease syndromes are associated with trisomy
of chromosome 21 (Down syndrome), 18 (Edwards syndrome) and 13 (Patau syndrome).
What is the result of trisomy of the other
chromosomes?
o
no disease symptoms
o
minor disease symptoms
o
disease symptoms with varying severity
based on genetic background
o
lethal early in development
A child contains what proportion of their parent’s
genetic makeup?
o
50:50
o
33:67
o
40:60
o
25:75
Why is working with linked genes not simple?
o
potential of crossing over in meiosis I
o
potential of independent assortment in
meiosis I
o
they reside on different chromosomes
o
one gene often masks the other gene
Question 40 of 40
Nondisjunction during meiosis II will result in
________.
o
n
o
n-1
o
n+1
o
n+1 and n-1
o
n,n-1 and n+1
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