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Transcription and Translation
Mechanisms of Genetics
1
All of the following nitrogenous bases are present in the mRNA
strand after transcription EXCEPT A
adenine.
B
thymine.
C
uracil.
D
guanine.
Transcription and Translation
Mechanisms of Genetics
3
Which of the following models best represents a portion of the process
of transcription?
A
B
C
D
Transcription and Translation
Mechanisms of Genetics
4
In a eukaryotic cell, transcription takes place in the -
6
A
mitochondria.
B
nucleus.
C
chloroplast.
D
cytoplasm.
The process of translation results in A
a complementary mRNA strand.
B
increased production of ribosomes.
C
a completed polypeptide chain.
D
replacement of disabled nucleotides.
Transcription and Translation
Mechanisms of Genetics
7
8
9
A point mutation is a change in DNA in which A
a nucleotide has been removed.
B
a base pair substitution is made.
C
an entire chromosome is damaged.
D
a section of DNA code is reversed.
The process of translation is responsible for producing which type of
molecule?
A
Polypeptide
B
RNA strand
C
DNA strand
D
New gene
A defective protein can be produced by a cell when a mutation has
which of the following effects?
A
Messenger RNA is prevented from being made.
B
It causes cells to divide in an uneven way.
C
An additional mRNA strand is caused to form.
D
The amino acid sequence coded by the gene is altered.
Transcription and Translation
Mechanisms of Genetics
10
11
Which of the following is the best explanation of the process of
translation?
A
An mRNA strand is copied from the original DNA sequence.
B
Amino acids are placed in order to build a protein.
C
A piece of DNA is moved along the chromosome.
D
DNA is changed due to a mistake or environmental factor.
A strand of DNA is made of a segment of nucleotides in this order:
GTCTAG. Which of the following sequences would be the correct
complementary strand of RNA?
A
GTCTAG
B
CAGATC
C
GUCUAG
D
CAGAUC
Transcription and Translation
Mechanisms of Genetics
12
13
There are many factors that may cause a mutation in a gene. Which
of the following events would be most likely to cause a mutation?
A
mRNA travels out of the nucleus.
B
mRNA is released from the DNA strand.
C
A nucleotide is inserted into a DNA strand.
D
An enzyme transcribes mRNA in the nucleus.
Which of the following stages is the first step during the process of
transcription?
A
A polypeptide strand is made.
B
Codons are read to produce an amino acid.
C
DNA is turned into an mRNA copy.
D
A section of DNA helix is unwound by an enzyme.
Transcription and Translation
Mechanisms of Genetics
14
The illustration shows a specific type of mutation that can occur during
DNA replication.
Which type of mutation is represented by the illustration?
A
Insertion
B
Deletion
C
Point
D
Chromosomal
Transcription and Translation
Mechanisms of Genetics
15
All of the following are reasons for regulation of gene expression in
eukaryotes EXCEPT –
A
cell differentiation.
B
embryonic development.
C
expression of every gene.
D
cell repair and replacement.