Replication

Examine the table of codons in Figure 14.2. A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be

3'-AAA-GAA-TAA-CAA-5'

A particular triplet of bases in the template strand of DNA is 5' AGT 3'. The corresponding codon for the mRNA transcribed is

3'-UCA-5'

During DNA replication which of the following enzymes removes the RNA nucleotides from the primer and adds equivalent DNA nucleotides to the 3' end of OKazaki fragments

DNA polymerase 1

Which enzyme catalyzes the elongation of a DNA strand in the 5' 3' direction?

DNA polymerase III

A new DNA strand elongates only in the 5' to 3' direction because

DNA polymerase can only add nucleotides to the free 3' end.

Figure 14.5 represents tRNA that recognizes and binds a particular amino acid (in this instance, phenylalanine). Which codon on the mRNA strand codes for this amino acid?

UUC

The genetic code is essentially the same for all organisms.Based on this information one can logically assume which of the following statements to be correct

a gene from an organism can theoretically be expressed by any other organism

What is a ribozyme

an RNA with enzymatic activity

the anticodon of a particular tRNA molecule is

complementary to the corresponding mRNA codon

During DNA replication, which of the following enzymes separates the DNA strands during replication?

helicase

What type of bonding is responsible for maintaining the shape of the tRNA molecule in figure 14.5

hydrogen bonding between base pairs

which of the following is a function of a ploy-A tail in mRNA

it helps protect the mRNA from degradation by hydrolytic enzymes

Which of the following best describes the significance of the TATA box in eukaryotic promoters

it is the recognition site for specific transcription factor

what is the role of DNA ligase in the elongation of the lagging strand during DNA replication?

it joins Okazaki fragments together.

Examine the table of codons in firger 14.2 what amino acid sequence will be produced based on the following mRNA codon sequence

met-ser-ser-leu-ser-leu

The tRNA shown in the figure has its 3' end projecting beyond its 5' end. What will occur at this 3' end?

the amino acid will bind covalently

The leading and the lagging strands of DNA formed during DNA replication differ in that

the leading strand is synthesized in the same direction as the movement of the replication fork

which of the following events in translation is the frist to occur in eukaryotes

the small subunit of the ribosome recognizing and attaching to 5 cap of mRNA