WorksheetsDNA STAAR Practice
Total questions: 14
Worksheet time: 18mins
Name
Class
Date
1.
Nitrogenous bases are located on both strands of the DNA double helix. What is the significance of the nitrogenous bases?
a)
The number of adenines and cytosines determines the type of RNA that will be produced.
b)
The order of nitrogenous bases determines the order of amino acids in the proteins synthesized.
c)
The amount of thymine and guanine in the DNA molecules determines the length of the genes.
d)
The type of hydrogen bonding between the nitrogenous bases determines which amino acid will be added to the peptide chain.
2.
Which DNA strand is complementary to the top one shown in the picture?
a)
A
b)
B
c)
C
d)
D
3.
A segment of DNA is represented in the illustration.
How is information for a specific protein carried on the DNA molecule?
How is information for a specific protein carried on the DNA molecule?
a)
As a sequence of nucleotides
b)
In the double-helix shape of the condensed chromosome
c)
In the ratio of adenines to thymines
d)
As a pattern of phosphates and sugars
4.
A model of a biological process is shown. What is the purpose of this process?
a)
To replicate the DNA of an organism before cell division
b)
To assemble nucleotides in an mRNA chain along a DNA template
c)
To synthesize amino acids used to unzip strands of DNA and copy the genetic code
d)
To translate the genetic code into a specific sequence of amino acids
5.
The initial steps in gene expression are modeled below. Double-stranded DNA first unwinds into two strands. Which process and product are represented in Diagram 2?
a)
Process: transcription; product: mRNA
b)
Process: translation; product: protein
c)
Process: replication; product: tRNA
d)
Process: recombination; product: polymerase
6.
Which of the following polypeptides is coded for by the mRNA sequence 5'AUG GUU AAA CGA CAA UCC3'?
*Use Codon Chart*
*Use Codon Chart*
a)
Val, Lys, Phe, Gly, Ser
b)
Met, Asp, Phe, Ala, Arg
c)
Met, Val, Lys, Arg, Gln, Ser
d)
Ile, Gln, Lys, Asp, Gly, Leu, Ser
7.
Different types of mutations can occur in DNA.The diagram represents a type of mutation. Which statement describes the mutation in the diagram?
a)
A silent mutation results in the insertion of a different amino acid.
b)
A substitution occurs with the adenine base.
c)
A deletion of a cytosine base occurs.
d)
A base is inserted into one strand of the DNA.
8.
Which of these is the direct result of an error in the transcription of a DNA nucleotide?
a)
The nuclear membrane is ruptured.
b)
Amino acids do not bond to tRNA.
c)
A codon sequence is incorrect.
d)
Transportation ofmRNA does not occur.
9.
Sickle-shaped red blood cells result from a mutation in the gene that codes for hemoglobin. This mutation results in sickle-cell anemia. A partial sequence of bases from a normal hemoglobin gene and a sequence that results in sickle-cell anemia are shown picture. What type of mutation is depicted in this sequence?
a)
Substitution
b)
Insertion
c)
Deletion
d)
Frameshift
10.
Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?
a)
F
b)
H
c)
G
d)
J
11.
Facial dimples and free earlobes are both considered dominant human traits. What are the expected phenotypes of the offspring of a female with dimples and free earlobes (DDFf) and a male with no dimples and attached earlobes (ddff)?
a)
50% with dimples and free earlobes and 50% with dimples and attached earlobes
b)
50% with dimples and free earlobes and 50% with no dimples and attached earlobes
c)
75% with dimples and free earlobes and 25% with no dimples and attached earlobes
d)
75% with dimples and attached earlobes and 25% with no dimples and free earlobes
12.
Four different types of cells are shown in picture. Which characteristic is shared by all four cells?
a)
A mechanism for transforming sunlight into energy
b)
Self-locomotion
c)
Membrane-bound organelles that transport substances
d)
Genetic material composed of DNA
13.
The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year. What causes this change in fur color?
a)
The arctic fox has two traits for fur color that are determined at birth.
b)
The alleles for fur color change as the arctic fox grows older.
c)
Gene expression for fur color is regulated by latitude.
d)
Gene expression for fur color is regulated by temperature.
14.
Which diagram demonstrates how crossing-over contributes to genetic variety during meiosis?
a)
A
b)
B
c)
C
d)
D
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