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WorksheetsD11T4 XLine 5
Total questions: 25
Worksheet time: 19mins
DNA replicates through a process called
dispersive replication
semi-dispersive replication
conservative replication
semiconservative replication
Which of the following enzymes separates the two DNA strands of the helix during DNA replication?
DNA helicase
DNA amylase
DNA ligase
DNA polymerase
DNA is able to store large amounts of genetic information.
Its contains a large number of nucleotides.
The sugar and phosphates can be arranged in many different sequences.
Its nucleotides can be arranged in large number of possible sequences.
The nitrogen bases can be altered to form many different letters in the sequence.
Which of the following numbered terms represents the correct order of sequences in a eukaryotic DNA as it was synthesized?
1. Okazaki fragments are joined together.
2. Formation of RNA primer.
3. Unwind the DNA strand.
4. Formation of leading and lagging strands.
1 --> 2--> 3 -->4
3 --> 2 --> 4 --> 1
2 --> 1 --> 4 --> 3
4 --> 2 --> 1 --> 3
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
All of the enzymes below are involved in the replication of DNA EXCEPT
DNA Helicase
DNA polymerase
RNA primase
RNA polymerase
Which of the following processes occurs in the cytoplasm of a eukaryotic cell?
Translation
Transcription
DNA replication
RNA processing
DNA ligase is an 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
join the two DNA strands (one new and one old) after replication
seal together the broken ends of DNA strands
What is the function of primase?
unwinding the DNA double strand to allow DNA polymerase to function
forming replication fork
making short strands of RNA at the site where replication begins
hydrolyzing ATP to facilitate DNA unwinding
What is the molecule which acts as an intermediate between the DNA and the ribosomes?
Messenger RNA
Transfer RNA
Ribosomal RNA
Intermediate RNA
If a DNA strand reads TAC GGC ATG, then the RNA molecules created by transcription would read
ATG CCG TAC
CGU AAU GCA
CGT AAT GCA
AUG CCG UAC
Which of the following statements about translation is NOT TRUE?
The product of translation is a polypeptide chain
Translation takes place at the ribosome surface
The triplet codes on tRNA are translated into amino acid sequences in polypeptides.
In translation process, the base adenine is complementary to uracil
What is the function of ribosomes during protein synthesis?
Attach to the mRNA and travel along the strand
Attach to the DNA molecule to produce mRNA
Translate mT+RNA to tRNA
Transcribe mRNA into rRNA
The process of initiation in transcription requires
a promoter sequence
Okazaki fragments
a DNA primer
DNA polymerase
A hormone molecule M is made up of two polypeptide chains: one chain contains 20 amino acids and the other chain contains 31 amino acids. What is the minimum number of nitrogenous bases in DNA required to code this molecule?
51
102
153
306
What is the process of RNA synthesis called?
Replication
Translation
Termination
Transcription
A promoter is
a substance which facilitates RNA transcription
a sequence of bases at which RNA polymerase begins transcription
a type of RNA which promotes cell division
an environmental change which causes transcription occur
One of the mRNA codons specifiying the amino acid leucine is 5’-CUA-3’. Its corresponding anticodon is
5’-GAT-3’
3’-AUG-5’
3’-GAU-5’
3’-GAT-5’
The following events occur in the replication of DNA:
1 bonds between complementary bases form
2 DNA molecule uncoils
3 opposite strands separate
4 sugar-phosphate bonds form in the new strands
5 free nucleotides align with complementary nucleotides on each strand
In which order do these events take place?
2 5 3 1 4
2 3 5 1 4
2 5 3 4 1
3 2 5 4 1
During the process of DNA replication, the lagging strand
is synthesized as small Okazaki fragments
is synthesized as a complementary leading strand
pairs with the leading strand
is made entirely of RNA primers
Okazaki Fragments are joined together by
RNA polymerase
DNA polymerase
RNA ligase
DNA ligase
A transcription unit that is 800 nucleotides long may use 1, 200 nucleotides to make a protein consisting of 400 amino acids. This is best explained by the fact that
many non-coding nucleotides are present
nucleotides break off and are lost during transcription
many nucleotides are needed and coded for each amino acid
there is redundancy and ambiguity in the genetic code
If the DNA triplets are GTT ACG, the tRNA anticodons would be
GTT ACG
ATG CGT
CAA UGC
GUU ACG
If the enzyme X is coded by 53 codons, how many amino acids are there in the polypeptide chain?
51
52
53
54
Which of the following is NOT involved in transcription?
Initiation factors
RNA polymerase
DNA template
Promoter
