A frameshift mutation could result from

either an insertion or a deletion of a base.

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 with a specific amino acid.

catalytic, making the tRNA a ribozyme.

In eukaryotic cells, transcription cannot begin until

several transcription factors have bound to the promoter.

the two DNA strands have completely separated and exposed the promoter.

the 5' caps are removed from the mRNA.

the DNA introns are removed from the template.

Which of the following does not occur in prokaryotic gene expression but does occur in eukaryotic gene expression?

a poly-A tail is added to the ends of the mRNA

mRNA, tRNA, and rRNA are transcribed

RNA polymerase binds to the promotor

Translation can begin as soon as transcription has begun even a little

Which of the follwoing best describes the significance of the TATA box in eukaryotic promoters?

it is the recognition site for a specific transcription factor

it sets the reading frame of the mRNA

it is the recognition site for ribosomal binding

it signals the end of the nucleotide sequence of the gene

What is the function of the poly-A tail in mRNA?

to help protect the mRNA from degradation by hydrolytic enzymes

to add modified guanin to the 3' end of the mRNA

to indicate the site of translational termination

to code for the binding of RNA polymerase to the DNA

enzyme that uses RNA as a substrate

an enzyme that catlyzes the association between the large and small ribosomal subunits

an enzyme tha synthesizes RNA primers during DNA replication

What must happen to a newly made polypeptide before it can be secreted from a cell?

its signal sequence must target it to the ER, after which it goes to the Golgi

it must be translated by a ribosome that remains free of attachment to the ER

Its signal sequence must be cleaved off

Its signal sequence must target it to the plasma membrane

What is the effect of a nucleotide-pair substitution that results in a nonsense mutation in a gene?

it introduces premature stop codon into the mRNA

it changes an amino acid in the encoded protein

It has no effect on the amino acid sequence of the encoded protein

it alters the reading frame of the mRNA

Which is the best description of a gene?

a DNA sequence that is expressed to form a functional product; either RNA or polypeptide

a DNA subunit that codes for a single complete protein

a DNA-RNA sequence combination that results in an enzymatic product

a descrete unit of hereditary information that consists of a sequence of amino acids

Students subjected three samples of five different molecules to gel electrophoresis as shown in the Figure. Which of the following statements best explains the pattern seen on the gel with regard to the size and charge of molecules A and B?

Molecules A and B are negatively charged, and molecule A is smaller than molecule B.

Molecules A and B are positively charged, and molecule A is smaller than molecule B.

Molecules A and B are positively charged, and molecule A is larger than molecule B.

Molecules A and B are negatively charged, and molecule A is larger than molecule B.

What is a restriction enzyme?

An enzyme that add to the DNA strand

An enzyme that breaks down lipids

In gel electrophoresis, the largest DNA fragment will appear

farthest from the starting wells

three quarters away from the starting wells

it depends on how many fragments there are

What is the end goal of PCR?

Look at banding patterns of DNA

In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin. The results of E. coli growth are summarized above. The shaded area represents extensive growth of bacteria; dots represent individual colonies of bacteria. Which of the following best explains why there is no growth on plate II?

The initial E. coli culture was not ampicillin resistant.

The transformation procedure killed the bacteria.

Nutrient agar inhibits E. coli grow

The bacteria on the plate were transformed.

In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin. The results of E. coli growth are summarized above. The shaded area represents extensive growth of bacteria; dots represent individual colonies of bacteria. Plates I and III were included in the experimental design in order to

demonstrate that the E. coli cultures were viable.

demonstrate that the plasmid can lose its ampr gene.

demonstrate that the plasmid is needed for E. coli growth.

prepare the E. coli for transformation.

In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin. The results of E. coli growth are summarized above. The shaded area represents extensive growth of bacteria; dots represent individual colonies of bacteria. Which of the following statements best explains why there are fewer colonies on plate IV than on plate III?

Not all E. coli cells are successfully transformed.

Plate IV is the positive control.

The bacteria on plate III did not mutate.

The plasmid inhibits E. coli growth.

AP Biology Unit 6 Topic Quiz

42 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

None of these identify the “semi-conservative” model.

After DNA replication, one completed strand contains a mixture of both parental DNA and daughter DNA dispersed throughout the strand.

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AP Biology Unit 6 Topic

Which of the following best describes a DNA molecule?

Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG

Seals the Okazaki fragments together

This repetitive sequences of DNA on the ends of chromosomes (TTAGGG) for protection.

Which enzyme is needed to start DNA replication?

What is meant by the description "antiparallel" regarding the strands that make up DNA?

What is meant that DNA replication follows a “semi-conservative” model?

Where does transcription occur in eukaryotic cells?

What is the complementary tRNA anticodon to the following mRNA codon: AUG

Transcribe the following DNA sequence:
TAT GGC ACT

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AP Biology Unit 6 Topic

Which of the following best describes a DNA molecule?

Which sequence of DNA bases would pair with this partial strandATG TGA CAG

Seals the Okazaki fragments together

This repetitive sequences of DNA on the ends of chromosomes (TTAGGG) for protection.

Which enzyme is needed to start DNA replication?

What is meant by the description "antiparallel" regarding the strands that make up DNA?

What is meant that DNA replication follows a “semi-conservative” model?

Where does transcription occur in eukaryotic cells?

What is the complementary tRNA anticodon to the following mRNA codon: AUG

Transcribe the following DNA sequence:TAT GGC ACT

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Discover more resources for Biology

Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG

Transcribe the following DNA sequence:
TAT GGC ACT