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WorksheetsUnit 4 Quizizz
Total questions: 30
Worksheet time: 15mins
Name
Class
Date
1.
Gene expression might be altered based on post-transcriptional processing in eukaryotes rather than prokaryotes because of which of the following?
a)
Eukaryotic mRNAs get 5' caps and 3' tails.
b)
Prokaryotic genes are expressed as mRNA, which is more stable in the cell.
c)
Prokaryotes use ribosomes of different structure and size.
d)
Eukaryotic exons may be spliced in alternative patterns.
2.
If a cell were unable to produce histone proteins, which of the following would be expected to occur?
a)
There would be an increase in the amount of "satellite" DNA produced during centrifugation
b)
The cell's DNA couldn't be packed into its nucleus.
c)
Spindle fibers would not form during prophase.
d)
Amplification of other genes would compensate for the lack of histones.
3.
What is the sequence of a peptide based on the mRNA sequence 5' UUUUCUUAUUGUCUU 3' ?
a)
leu-cys-tyr-ser-phe
b)
cyc-phe-tyr-cys-leu
c)
phe-leu-ile-met-val
d)
phe-ser-tyr-cys-leu
4.
The strands that make up DNA are antiparallel. This means that
a)
the twisting nature of DNA creates nonparallel strands.
b)
one strand is positively charged and the other is negatively charged.
c)
the 5' to 3' direction of one strand runs counter to 5' to 3' direction of the other strand.
d)
base pairings create unequal spacing between the two DNA strands.
5.
Which of the following molecules, when taken up by the cell, binds to the repressor so that the repressor no longer binds to the operator?
a)
inducer
b)
ubiquitin
c)
promotor
d)
repressor
6.
What is a genome?
a)
the complete complement of an organism's genes
b)
a specific sequence of polypeptides within each cell
c)
a specialized polymer of four different kinds of monomers
d)
a specific segment of DNA that is found within a prokaryotic chromosome
7.
The figure below represents the stained nucleus from a cheek epithelial cell of an individual whose genotype would probably be
a)
XX
b)
XY
c)
XYY
d)
XXX
8.
A researcher found a method she could use to manipulate and quantify methylation of DNA in embryonic cells in culture. One of her colleagues suggested she try increased methylation of C nucleotides in a mammalian system. Which of the following results would she most likely see?
a)
increased chromatin condensation
b)
decreased transcription of the selected genes
c)
activation of histone tails for enzymatic function
d)
decreased chromatin condensation
9.
Which of the following descriptions of nucleotide triplets best represents a codon?
a)
a triplet separated spatially from other triplets
b)
a triplet that has no corresponding amino acid
c)
a triplet at the opposite end of tRNA from the attachment site of the amino acid
d)
a triplet in the same reading frame as an upstream AUG
10.
Metabolic pathways that release stored energy by breaking down complex molecules are known as
a)
catabolic pathways
b)
anabolic pathways
c)
endergonic pathways
d)
bioenergetic pathways
11.
Which of the following is true for both prokaryotic and eukaryotic gene expression?
a)
After transcription, a 3' poly-A tail and a 5' cap are added to mRNA.
b)
Translation of mRNA can begin before transcription is complete.
c)
RNA polymerase binds to the promoter region to begin transcription.
d)
mRNA is synthesized in the 3' ? 5' direction.
12.
Which of the following statements best describes the termination of transcription in prokaryotes?
a)
RNA polymerase transcribes through the polyadenylation signal, causing proteins to associate with the transcript and cut it free from the polymerase.
b)
RNA polymerase transcribes through the terminator sequence, causing the polymerase to separate from the DNA and release the transcript.
c)
RNA polymerase transcribes through an intron, which causes the polymerase to let go of the transcript.
d)
Once transcription has initiated, RNA polymerase transcribes until it reaches the end of the chromosome.
13.
Which of the following DNA mutations is the most likely to be damaging to the protein it specifies?
a)
base-pair deletion
b)
codon substitution
c)
substitution in last base of codon
d)
codon deletion
14.
"CROSS I. Purebred lines of wild-type fruit flies (gray body and normal wings) are mated to flies with black bodies and vestigial wings.
F1 offspring all have a normal phenotype.
CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).
Our results give the followin data chart:
Gray body; normal wings: 575 total, 25.1 %
Black body; vestigial wings: 571 total, 24.9 %
Black body; normal wings: 577 total, 25.2 %
Gray body; vestigial wings: 568 total, 24.8 %
Mr. Woodard gives the statement: "Vestigial wings are a recessive trait.
F1 offspring all have a normal phenotype.
CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).
Our results give the followin data chart:
Gray body; normal wings: 575 total, 25.1 %
Black body; vestigial wings: 571 total, 24.9 %
Black body; normal wings: 577 total, 25.2 %
Gray body; vestigial wings: 568 total, 24.8 %
Mr. Woodard gives the statement: "Vestigial wings are a recessive trait.
a)
CROSS I results give evidence supporting the statement.
b)
CROSS I results give evidence against the statement.
c)
CROSS II results give evidence supporting the statement.
d)
CROSS II results give evidence against the statement.
15.
CROSS I. Purebred lines of wild-type fruit flies (gray body and normal wings) are mated to flies with black bodies and vestigial wings.
F1 offspring all have a normal phenotype.
CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).
Our results give the followin data chart:
Resulting Offspring I Normal Percentage
Gray body; normal wings 575 25.1
Black body; vestigial wings 571 24.9
Black body; normal wings 577 25.2
Gray body; vestigial wings 568 24.8
Tweek the Rat states: The genes for body color and wing shape are linked.
F1 offspring all have a normal phenotype.
CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).
Our results give the followin data chart:
Resulting Offspring I Normal Percentage
Gray body; normal wings 575 25.1
Black body; vestigial wings 571 24.9
Black body; normal wings 577 25.2
Gray body; vestigial wings 568 24.8
Tweek the Rat states: The genes for body color and wing shape are linked.
a)
CROSS I results give evidence supporting the statement.
b)
CROSS I results give evidence against the statement.
c)
CROSS II results give evidence supporting the statement.
d)
CROSS II results give evidence against the statement.
16.
Muscle cells and nerve cells in one species of animal owe their differences in structure to
a)
having different genes
b)
having different chromosomes
c)
having different genetic codes
d)
having differential gene expression
17.
The phenomenon in which RNA molecules in a cell are destroyed if they have a sequence complementary to an introduced double-stranded RNA is called
a)
RNA interfearance
b)
RNA obstruction
c)
RNA blocking
d)
RNA targeting
18.
The tRNA shown in the figure below has its 3' end projecting beyond its 5' end. What will occur at this 3' end?
a)
covalent bonding between sulfur atoms
b)
ionic bonding between phosphates
c)
hydrogen bonding between base pairs
d)
peptide bonding between amino acids
19.
The most prominent component of the DNA in eukaryotic genomes is
a)
operons
b)
Alu elements
c)
gene regulatory sequences
d)
transposable elements and related sequences
20.
A particular triplet of bases in the template strand of DNA is 5'-AGT-3'. The corresponding codon for the mRNA transcribed is
a)
3'-UCA-5'.
b)
3'-UGA-5'
c)
5'-TCA-3'.
d)
3'-ACU-5'
21.
The nitrogenous base adenine is found in all members of which group?
a)
proteins, triglycerides, and testosterone
b)
proteins, ATP, and DNA
c)
ATP, RNA, DNA
d)
alpha glucose, ATP, and DNA
22.
It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information based on which of the following characteristics?
a)
The sequence of bases
b)
phosphate-sugar backbones
c)
complementary pairing of bases .
d)
different five-carbon sugars
23.
In biotechnology, genes are commonly introduced into bacterial cells by incubating the cells together with DNA and high concentrations of calcium ions. This is an example of
a)
transformation.
b)
translocation.
c)
transduction.
d)
conjugation.
24.
You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent
a)
leading strands and Okazaki fragments.
b)
lagging strands and Okazaki fragments.
c)
Okazaki fragments and RNA primers.
d)
leading strands and RNA primers.
25.
Five dialysis bags, constructed from a semipermeable membrane that is impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed.
Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment?
Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment?
a)
A
b)
B
c)
C
d)
D
26.
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
a)
CO2 and glucose
b)
H2O and O2
c)
ATP and NADPH
d)
electrons and H+
27.
Which of the following is a function of the protein called ubiquitin?
a)
It assists in the removal of introns from a eukaryotic pre-mRNA.
b)
It attaches to proteins that are marked for destruction in the cell.
c)
It initiates the formation of a transcription complex.
d)
It adds the 3' and 5' caps to eukaryotic pre-mRNA.
28.
The tryptophan operon is a repressible operon that is
a)
permanently turned on.
b)
turned on only when tryptophan is present in the growth medium.
c)
turned off whenever tryptophan is added to the growth medium.
d)
turned on only when glucose is present in the growth medium
29.
After mixing a heat-killed, phosphorescent strain of bacteria with a living non-phosphorescent strain, you discover that some of the living cells are now phosphorescent. The best evidence that the ability to fluoresce is a heritable trait would be an observation that
a)
DNA passed from the heat-killed strain to the living strain.
b)
protein passed from the heat-killed strain to the living strain.
c)
the phosphorescence in the living strain is especially bright.
d)
descendants of the living cells are also phosphorescent.
30.
Introns are significant to biological evolution because
a)
their presence allows exons to be moved around more easily, creating proteins with new combinations of functional domains.
b)
they protect the mRNA from degeneration.
c)
they are translated into essential amino acids.
d)
they maintain the genetic code by preventing incorrect DNA base pairings.
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