Font size
WorksheetsUnit 4 Practice Questions
Total questions: 50
Worksheet time: 25mins
The enzyme used to separate the double helix into 2 single strands is:
Helicase
DNA polymerase
Gyrase
Lipase
Which of the following complementary base pairs are correct?
A-G
C-A
T-C
G-C
Which of the following best describes a DNA molecule?
made of amino acids
double helix strands
contains Uracil
Does not contain hydrogen bonds
Where does DNA replication take place?
Nucleus
Ribosome
Cytoplasm
Golgi Body
An enzyme that adds complementary nucleotides to the template strand of the unzipped double helix until the entire molecule has been replicated.
RNA Polymerase
DNA Polymerase
Helicase
Ligase
DNA replication results in two DNA molecules,
each one with two original strands
each one with two new strands
each one with one new strand and one original strand
one with two new strands and the other with two original strands
DNA is a polymer made of monomers (building blocks) called:
Amino acid
Ribose
Fatty acid
Nucleotides
What are the 3 parts of a nucleotide?
Sugar, Phosphate, Nucleotide
Sugar, Potassium, Nitrogen Base
Nitrogen, Phosphate, Nucleotide
Nitrogen base, phosphate, sugar
DNA Replication is called "semi-conservative" because it saves, or conserves, what?
part of the old strand of DNA
energy
the new nitrogen bases
the new sugars and phosphates
The two sides of the DNA ladder run ______________ to each other.
Parallel
Anti-parallel
Perpendicular
Neutral
In complementary base pairing in DNA:
A pairs with T, C pairs with G
A pairs with U, C pairs with G
A pairs with C, T pairs with G
A pairs with G, C pairs with T
Any base can pair with any other base
A DNA triplet on the strand that is transcribed has the bases TAG. Which anticodon on tRNA is used in translation?
AUC
UAG
TAG
ATC
The data shows part of the genetic code for mRNA. Which anticodon could be found on a tRNA molecule bonded to lysine?
AAG
UUC
TTT
GAA
The gene that codes for a particular polypeptide includes the base sequence shown. GAGTACCCT What is the base sequence of the mRNA molecule which is complementary to this sequence?
GAGTACCCT
CTCATGGGA
GUGTUCCCT
CUCAUGGGA
What is the name for a chain of amino acids?
Polypeptide chain
Triglycerides
Polysaccharides
Nucleotides
What amino acid does the mRNA GUC code for?
valine
pehnylalanine
glutamine
leucine
Write the complementary DNA sequence for the section of DNA below.
TAC AAA GCG ACT
(a)
Write the mRNA strand that would be transcribed from the section of DNA below.
TAC AAA GCG ACT
(a)
Number 3 is pointing to ___ which was made during ___
tRNA, translation
protein, translation
DNA, replication
mRNA, transcription
Number 6 is pointing to to three nucleotides on tRNA which is referred to as a(n)
codon
amino acid
anticodon
tRNA
protein
Number 5 is pointing to a(n)
codon
amino acid
anticodon
tRNA
protein
Why must transcription occur where DNA can be found?
because DNA can't leave
because ribosomes are in the nucleus
because DNA polymerase is found there
because helicase unzips the DNA
Which of the following is a codon?
ATG
AUG
AUT
A DNA nucleotide may be made up of a phosphate group, along with
deoxyribose sugar and uracil
ribose sugar and cytosine
deoxyribose sugar and thymine
ribose sugar and adenine
What is a point mutation?
A change in a single nucleotide in the DNA sequence.
A large deletion of a segment of DNA.
A duplication of a whole chromosome.
A rearrangement of several chromosomes.
Which of the following is an example of a frameshift deletion?
REMOVING one nucleotide from a DNA sequence.
SUBSTITUTING one nucleotide for another.
ADDING three nucleotides to a DNA sequence.
CHANGING the position of a gene within the genome.
How does a silent mutation affect the protein produced by the gene?
It changes the SHAPE of the protein.
It causes the protein to be SHORTER than normal.
It does NOT change the protein at all.
It makes the protein non-functional.
How does a nonsense mutation differ from a missense mutation?
It does not change the amino acid sequence.
It changes one amino acid to another.
It introduces a stop codon, leading to premature termination.
It results in a longer protein sequence.
What occurs in a nonsense mutation?
A base change results in a stop codon
A base is inserted, shifting the reading frame
A base is switched, changing one amino acid
A base is deleted, shortening the sequence
What is the effect of a missense mutation on the protein?
One amino acid changes
The protein is shortened
The reading frame shifts
The protein is duplicated
Mutation: ATC GCAT
What mutation occurred?
T-G-A-C-C-A
T-G-A-G-C-A
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
What is the ratio of the cross?
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
The following items are examples of __________.
Items: eye color, hair color, height
homozygous alleles
genotype
heterozygous alleles
phenotype
A couple has three brown-eyed children. The parents are brown-eyed (Bb). The allele for brown eyes is dominant over the allele for blue eyes. They believe the fourth child they have will be blue-eyed. Which statement below explains what actually will happen?
The couple will have a blue-eyed fourth child.
The couple will have a brown-eyed fourth child.
They have a 75% chance of having a blue-eyed child.
They have a 25% chance of having a blue-eyed child.
In a population of 100 offspring, how many would you expect to be homozygous dominant in a cross between a homozygous dominant and a homozygous recessive parent?
0
25
50
75
100
