Part 1 True/False Activators are eukaryotic transcription factors that bind to t
ID: 220528 • Letter: P
Question
Part 1
True/False
Activators are eukaryotic transcription factors that bind to the enhancer region.
Part 2
During transcription, double stranded DNA is transcribed into a complementary molecule of
Multiple Choice
single-stranded tRNA.
single-stranded DNA.
single-stranded mRNA.
double-stranded DNA.
Part 3
mRNA contains three-base units of DNA that are called _____, each of which code for one amino acid.
Multiple Choice
codons
anticodons
ribosomes
tRNA
Part 4
During the process of translation, mRNA is carried to the ribosome, where it is translated into polypeptides by _____ molecules.
Multiple Choice
tRNA
amino acid
DNA
carbohydrate
Part 5
How is transcription altered in the absence of lactose?
Multiple Choice
transcription is unaffected
transcription is inhibited
transcription is increased
Part 6
The regulatory genes that encode for the repressor protein are always being transcribed; it is the presence or absence of the lactose molecule that controls whether the operon is on or off.
True/False
Part 7
Which of the following statements best describes the overall process of DNA replication?
Multiple Choice
A double-stranded DNA molecule is replicated to form two single-stranded DNA molecules.
A double stranded DNA molecule is replicated to form two double-stranded DNA molecules, each containing one parent strand and one new strand.
A double-stranded DNA molecule is replicated to form two double-stranded DNA molecules, one of which consists of the two parent strands and one of which consists of the two new strands.
A double-stranded DNA molecule is replicated to form four single-stranded DNA molecules.
Part 8
A mutation that causes a change in a single nucleotide in DNA
Multiple Choice
changes the corresponding nucleotide in mRNA, resulting in a different codon.
will have no effect on the resulting protein.
causes protein synthesis to stop.
causes the codon to be correct, but the anticodon to be incorrect.
Explanation / Answer
Part 1
Answer: True
Activator deinition: A transcriptional activator is a protein (transcription factor) that increases gene transcription of a gene or set of genes. Most activators are DNA-binding proteins that bind to enhancers or promoter-proximal elements.
Part 2
Answer: Sigle stranded messenger RNA (mRNA)
Transcription Deinition: Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (especially mRNA) by the enzyme RNA polymerase.
Part 3
Answer: Codons
Deinition: mRNA encodes the information for one protein (or more than one protein in bacteria), with each sequence of three nitrogen-containing bases in the mRNA specifying the incorporation of a particular amino acid within the protein.
Part 4
Answer: Amino acid
Part 5
Answer: Transcription is unaffected
Part 6:
Answer: True
Part 7
Answer: A double stranded DNA molecule is replicated to form two double-stranded DNA molecules, each containing one parent strand and one new strand.
Part 8
Answer: Changes the corresponding nucleotide in mRNA, resulting in a different codon.