WorksheetsCN Bio Ch. 14-16
Total questions: 28
Worksheet time: 14mins
Put these in the correct order from first to last in translation:
Elongation, Initiation, Termination
Initiation, Elongation, Termination
Initiation, Termination, Elongation
Elongation, Termination, Initiation
All the DNA in one cell of an organism is
Karyotype
Pedigree
Genome
Mutation
What is responsible for holding the two strands of the DNA double helix together?
Hydrogen bonds
London dispersion forces
Peptide bonds
Covalent bonds
The production of mature mRNA in eukaryotes involves
Cutting introns out and splicing exons together
Adding the 5’ cap
Adding the 3’ poly A tail
All of choices are correct
What is meant that DNA replication follows a “semi-conservative” model?
After DNA replication, each strand contains one side that is a parental strand and the other side is a daughter strand.
After DNA replication, one completed strand contains only parental DNA while the other contains only daughter DNA.
After DNA replication, one completed strand contains a mixture of both parental DNA and daughter DNA dispersed throughout the strand.
Suppose a double-stranded DNA molecule was shown to have 15% adenine bases. What would be the expected percentage of guanine in that molecule?
15%
85%
35%
70%
In DNA, the amount of A is equal to the amount of
C
T
G
U
Which enzyme is not working correctly if new DNA bases are not added to the template strand?
Primase
DNA polymerase
Ligase
Exonuclease
_______________ are organic molecules that have the function of starting and regulating chemical reactions.
Carbohydrates
Lipids
Enzymes
Sugars
Which of the following occurs at the ribosomes?
Most of a cell’s DNA molecules are stored there.
Proteins are produced there.
mRNA are produced there.
Carbohydrates are synthesized there.
A gene is essentially a
Sequence of many codons in a DNA molecules
Single codon in a DNA molecule
A chain of amino acids
Chromosome
This molecule moves amino acids from the cytoplasm to the ribosome to combine with the growing polypeptide chain.
mRNA
rRNA
tRNA
DNA
The DNA strand that provides the sequence of nucleotides for RNA transcription is the
DNA ligase strand
Template strand
mRNA strand
rRNA strand
How can a person’s muscle cells have the same exact DNA sequence as their nerve cells even though they look different and perform different functions?
The two different cells become mutated during function.
They actually have different DNA in the two types of cells.
The proteins expressed in each cell are different.
The genome of the different cells changes.
__________ is the activation of a gene that results in transcription.
Gene expression
Eukaryotic expression
Prokaryotic expression
Protein expression
Where does translation occur?
Nucleus
Cytoplasm
Ribosomes
Mitochondria
What does translation start with?
RNA molecule
DNA molecule
Protein
Amino acid
In the genetic code, a sequence of ____ nucleotides in ________ constitutes a(n) ________, which specifies a particular amino acid.
two; mRNA; anticodon
three; tRNA; codon
three; mRNA; codon
three; mRNA; anticodon
Which enzyme catalyzes the elongation of a DNA strand in the 5' --> 3' direction?
primase
DNA ligase
DNA polymerase
topoisomerase
What determines the nucleotide sequence of the newly synthesized strand during DNA replication?
the particular DNA polymerase catalyzing the reaction
the relative amounts of the four nucleoside triphosphates in the cell
the nucleotide sequence of the template strand
the primase used in the reaction
Which of the following separates the DNA strands during replication?
helicase
DNA polymerase III
ligase
DNA polymerase I
In a nucleosome, the DNA is wrapped around
polymerase molecules.
ribosomes
histones
a thymine dimer
A particular triplet of bases in the template strand of DNA is 5' AGT 3'. The corresponding codon for the mRNA transcribed is
3' UCA 5'
3' UGA 5'
5' TCA 3'
3' ACU 5'
Which of the following nucleotide triplets best represents a codon?
a triplet separated spatially from other triplets
a triplet that has no corresponding amino acid
a triplet at the opposite end of tRNA from the attachment site of the amino acid
. a triplet in the same reading frame as an upstream AUG
What are the coding segments of a stretch of eukaryotic DNA called?
introns
exons
codons
replicons
As a ribosome translocates along an mRNA molecule by one codon, which of the following occurs?
The tRNA that was in the A site moves into the P site.
The tRNA that was in the P site moves into the A site.
The tRNA that was in the A site moves to the E site and is released.
The tRNA that was in the A site departs from the ribosome via a tunnel.
What does a promoter do?
It allows a gene to be transcribed.
It creates a DNA segment.
It is another word for ribosome.
It stops protein production.
A protein that binds to the operator and blocks RNA polymerase.
Regulator
Repressor
Promoter
Primer
