WorksheetsBiology: Expression of Biokogical Information
Total questions: 20
Worksheet time: 30mins
Name
Class
Date
1.
What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?
a)
DNA polymerase can join new nucleotides to the 3' end of the preexisting strand.
b)
Helicases and single-strand binding proteins work at the 5' end.
c)
The origins of replication occur only at the 5' end.
d)
DNA ligase works only in the 3' to 5' direction
2.
In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules?
a)
A = G
b)
A + G = C + T
c)
A + T = G + G
d)
A = C
3.
Which of the following is NOT true of a codon?
a)
It may code for the same amino acid as another codon.
b)
It never codes for more than one amino acid.
c)
It extends from one end of a tRNA molecule.
d)
It is the basic unit of the genetic code.
4.
The anticodon of a particular tRNA molecule is
a)
complementary to the corresponding mRNA codon.
b)
complementary to the corresponding triplet in rRNA.
c)
the part of tRNA that bonds with a specific amino acid.
d)
catalytic, making the tRNA a ribozyme.
5.
What are the two steps of protein synthesis (in order)?
a)
Translation and Replication
b)
Transcription and Translation
c)
Replication and Transcription
d)
Replication and Mitosis
6.
Which types of RNA are produced during transcription? (Choose all that apply)
a)
mRNA
b)
tRNA
c)
rRNA
d)
pRNA
7.
Which of the following units are repeatedly joined together to form a strand of DNA?
a)
amino acids
b)
nucleotides
c)
fatty acids
d)
polysaccharides
8.
Okazaki fragments form on the:
a)
lagging strand
b)
leading strand
c)
base-pairs
d)
5' end
9.
An operon consists of all the the following EXCEPT
a)
operator
b)
promoter
c)
regulatory gene
d)
genes of the operon
10.
Operons are found in which of the following organisms?
a)
Bacteria(prokaryotes)
b)
plants and animals(eukaryotes)
c)
only animals
d)
virsuses
11.
The "on/off" switch for an operon is called the
a)
promoter
b)
repressor
c)
operator
d)
gene
12.
A protein that binds to the operator and blocks the RNA polymerase
a)
regulator
b)
repressor
c)
activator
d)
corepressor
13.
Most gene regulation happens at which step along the way?
a)
translation
b)
transcription
c)
signal transduction
d)
DNA replication
14.
In the lac operon the inducer is
a)
lactose
b)
glucose
c)
galactose
d)
all of the above
15.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
16.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
17.
Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG
ATG TGA CAG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
18.
What organisms have DNA?
a)
Virus
b)
Plant
c)
Bacteria
d)
All living things
19.
In a sample of DNA, 20 percent is Adenine. What are the percentages of the other bases?
a)
Thymine - 30 percent, Cytosine 25 percent, Guanine 25 percent
b)
Cytosine - 20 percent, Thymine - 30 percent, Guanine 25 percent
c)
Thymine - 20 percent, Cytosine 30 percent, Guanine 30 percent
d)
Thymine - 30 percent, Cytosine 30 percent, Guanine 20 percent
20.
How would the DNA sequence GCTATA be transcribed to mRNA?
a)
GCUAUA
b)
CGATAT
c)
CGAUAU
d)
GCUTUT
100 %
