WorksheetsTUTORIAL CHAPTER 5: EXPRESSION OF BIOLOGICAL INFORMATION
Total questions: 20
Worksheet time: 16mins
Which of the following statements about DNA is false?
DNA is capable of forming many different sequences.
DNA contains thymine instead of uracil.
DNA is double-stranded rather than single-stranded.
DNA is only found in eukaryotic cells.
The information carried by DNA is incorporated in a code specified by the:
phosphodiester bonds of the DNA strand
number of separate strands of DNA.
size of a particular chromosome.
specific nucleotide sequence of the DNA molecule.
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
Which of the following is a characteristic of uracil?
The ability to bond with adenine.
The ability to bond with guanine.
It is a purine.
The ability to bond with cytosine.
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
A codon..
consists of two nucleotides.
may code for the same amino acids as another codon.
consists of discrete amino acid regions
catalyzes RNA synthesis.
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
