WorksheetsChapter 6: Expression of biological information
Total questions: 32
Worksheet time: 19mins
The two molecules that alternate to form the backbone of a polynucleotide chain are:
adenine and thymine.
cytosine and guanine.
sugar and phosphate.
base and sugar
What kind of chemical bond is found between paired bases of the DNA double helix?
Hydrogen
Ionic
Covalent
Phosphate
Which of the following represents a similarity between RNA and DNA?
Bothe are double-stranded and found exclusively in the nucleus.
The presence of uracil.
The presence of an OH group on the 2’ carbon of the sugar.
Nucleotides consisting of a phosphate, sugar and nitrogenous base.
The strands that make up DNA are antiparallel. This means that...
the twisting nature of DNA creates nonparallel strands.
the 5’ to 3’ direction of one strand runs counter to the 5’ to 3’ direction of the other strand.
base pairings create unequal spacing between the two DNA strands.
one strand is positively charged and the other is negatively charged.
What kind of molecule or substance is the primer that is used to initiate the synthesis of a new DNA strand?
RNA
DNA
Protein
phosphate
Primase is the enzyme responsible for:
unwinding the DNA double strand to allow DNA polymerase access to the template DNA
introducing nicks into the DNA double strand in order to prevent the formation of knots.
hydrolyzing ATP to facilitate DNA unwinding.
making short strands of RNA at the site of replication initiation.
RNA synthesis is also known as:
elongation.
reverse transcription.
translation.
transcription.
A particular triplet of bases in the template strand of DNA is AGT. The corresponding codon for the mRNA transcribed is
AGT
UGA
TCA
ACU
Translation occurs in..
the cytoplasm.
a lysosome.
the nucleus.
a ribosome.
All of the following are directly involved in translation except
mRNA
tRNA
ribosomes
DNA
In all organisms, the AUG codon codes for:
the initiation of translation.
the termination of transcription
the termination of chain elongation.
the amino acid valine.
The anticodon of a particular tRNA molecule is...
complementary to the corresponding mRNA codon.
complementary to the corresponding triplet in rRNA
the part of tRNA that bonds to a specific amino acid.
changeable, depending on the amino acid that attaches to the tRNA.
A particular triplet of bases in the coding sequence of DNA is AAA. The anticodon on the tRNA that binds the mRNA codon is...
TTT
UUA
UUU
AAA
What are ribosomes composed of?
rRNA only
proteins only
both rRNA and protein
mRNA, tRNA, rRNA and protein
Which of the following components are present upon the completion of translation initiation?
Small ribosomal subunit.
Large ribosomal subunit.
Initiator tRNA.
All of the above.
A polyribosome is...
a complex of many ribosome and an mRNA.
a complex of many ribosomes in eukaryotes.
an initiation complex in eukaryotes.
an elongation complex in eukaryotes
A new DNA strand only elongated in the 5’ to 3’ direction because
DNA polymerase adds nucleotides at the 5’ end
Replication must progress toward the replication fork
Okazaki fragments prevent elongation in the 3’ to 5’ direction
DNA polymerase adds nucleotides only to the free 3’ end
DNA ligase are enzymes that
Unwind the double helix of DNA during replication
Link the nucleotides of the new DNA strand along the template of the old strand
Rejoin the two DNA strands (one new and one old) after replication
Seal together the broken ends of DNA strands
Replication of DNA produces
RNA molecule
Only new DNA
Two DNA molecule
Excessive DNA
What is the function of DNA strand during DNA replication?
Replicate
Substitute into new strand
Template
Complementary
Which of the following does NOT involved in transcription?
Stop codon
RNA polymerase
Terminator
Promoter
Which of the following is NOT considered as a part of a lactose operon?
Regulatory gene
Promoter
Operator
Structural genes
Which of the following is the major enzyme that involved in DNA
replication?
I. Helicase
II. Reverse transcriptase
III. Topoisomerase
IV. DNA polymerase
V. Aminoacyl-tRNA synthetase
I, III and IV
I, III and V
I,II, III and IV
II, III, IV and V
Which of the following start the synthesis of a new DNA?
RNA primer
DNA polymerase
Okazaki fragment
DNA ligase
What is the role of DNA ligase in DNA replication?
Synthesize of short RNA primer by adding RNA nucleotide
Replaces the RNA primer by adding the DNA nucleotide
Join Okazaki fragment at lagging strand forming phosphodiester bond
Unwind the double stranded DNA to become single stranded DNA
In DNA
replication, new nucleotides are added to a growing DNA by…………………
DNA helicase
DNA polymerase III
RNA polymerase
RNA primer
AATCATGGA
