CST Review Questions

The Chemistry of DNA and Molecular Genetics

The diagram below represents a portion of a nucleic acid molecule. The part indicated by arrow X could be

1. adenine.

2. ribose.

3. deoxyribose.

4. phosphate.

Question 1

Question 2

The molecule coded directly from DNA is represented by number

1. 12. 23. 34. 4

What is an example of a molecule produced by this type of process?

1. glucose

2. glycogen

3. a fatty acid

4. a protein

Question 3

A mutation may occur in a gene as a result of the

1. synthesis of a

spindle apparatus.

2. loss of a nucleotide.

3. loss of a nucleolus.

4. replication of

centromeres.

Question 4

Which organelle in the diagram below represents an exception to the cell theory because it contains genetic material and can reproduce within the cell?

1. A

2. B

3. C

4. D

Question 5

The diagram below represents a portion of a

chromosome of a fruit fly.

What would most likely be located at area A?

1. centrioles

2. spindle fibers

3. nucleolus

4. nucleic acid

Question 6

Question 3The structure and location of a cellular component is represented

in the diagram below. The polymer in the diagram most likely contains

1. adenosine triphosphate.

2. lipids.

3. genes.

4. hydrolytic enzymes.

Question 7

Question 3Which processes occur in the nucleus?

1. 1 and 2

2. 2 and 3

3. 3 and 4

4. 4 and 5

Question 8

Process 1 is known as

1. replication

2. mutation

3. nondisjunction

4. translocation

Question 9

What is the product of process 3?

1. a strand of DNA

2. two complementary strands of DNA

3. a strand of RNA

4. a chain of amino acids

Question 10

If an adenine nucleotide is deleted from a nucleotide sequence in a DNA molecule, the result is a

1. clone

2. mutation

3. polypeptide

4. hybrid

Question 11

One strand of DNA could be as long as a football field if it were stretched out lengthwise. One of the factors allowing DNA to fit inside the nucleus of a cell is its ability to

1. break apart into separate genes.2. extend to form very long, thin molecules.3. coil tightly around associated proteins.4. denature from the effect of an enzyme.

Question 12

In an experiment, the height of several plants was recorded daily in millimeters. Which tool would be the most accurate and appropriate for this measurement?

1. Digital scale2. Graduated cylinder3. Yardstick4. Metric ruler

Question 13

The diagram below shows a strand 3 of DNA matched to a strand of messenger RNA. What process does this diagram represent?

1. mutation

2. respiration

3. transcription

4. translation

Question 14

Why is the particular sequence of bases in a segment of DNA important to cells?

1. Some base sequences code for protein production.

2. Some base sequences cause the release of lipids from the nucleus.

3. Some base sequences contain the order of sugars in polysaccharides.

4. Some base sequences produce electrical signals sent to the cytoplasm.

Question 15

A rare genetic condition causes 30 dwarfism and immunodefi ciencies. Which of the following is the most likely cause of this condition?

1. a parasitic infection

2. a mutation in DNA

3. a bacterial disease

4. an excess of ATP

Question 16

The weakest bonds in a double-stranded molecule of deoxyribonucleic acid exist between the

1. deoxyribose sugars.

2. phosphate groups.

3. nitrogenous bases.

4. 5-carbon sugars.

Question 17

The types of enzymes produced in a cell are regulated by the

1. order of nucleotides in DNA molecules.2. shape of DNA molecules.3. size of nucleotides in DNA

molecules.4. location of DNA molecules.

Question 18

Molecules C, D, and E will combine to form part of

1. a polypeptide.

2. a polysaccharide.

3. DNA.

4. RNA.

Question 19

Structure B represents a molecule of

1. nuclear DNA.

2. cytoplasmic DNA.

3. ribosomal RNA.

4. transfer RNA.

Question 20

How many codons are located on the messenger RNA molecule in the diagram?

1. 1

2. 6

3. 3

4. 9

Question 21

The type of molecule represented at A is synthesized according to a template found in

1. DNA.

2. RNA.

3. dipeptides.

4. amino acids.

Question 22

One similarity between DNA and messenger RNA molecules is that they both contain

1. the same sugar.

2. genetic codes based on sequences of bases.

3. a nitrogenous base known as uracil.

4. double-stranded polymers.

Question 23

DNA replicates through a process called   

1.  dispersive replication.

2.  semidisperive replication.

3.  conservative replication.

4.  semiconservative replication.

Question 24

When DNA replication occurs, the enzyme which separates the two sides of the helix is called

  

1. DNA polymerase.

2. DNA amylase.

3. DNA ligase.

4. DNA helicase.

Question 25

The enzyme which bonds new nitrogenous bases to those existing on the original DNA strand is called

  

1.DNA polymerase.

2.DNA amylase.

3.DNA ligase.

4.DNA helicase.

Question 26

Okazaki fragments are formed because   

1. DNA polymerase can only create a new strand of DNA from the 5' end to the 3' end.

2. DNA polymerase can only create a new strand of DNA from the 3' end to the 5' end.

3. newly formed DNA tends to break apart easily into fragments.

4. DNA helicase sometimes inadvertently breaks the DNA.

Question 27

One important difference between DNA replication in prokaryotes and eukaryotes is that  

 

1. prokaryotes do not use enzymes in the replication process

2. there is only one replication origin in prokaryotes

3. there are no Okazaki fragments in prokaryotes4. replication is conservative, not

semiconservative, in prokaryotes

Question 28

Which of the following must happen first in order for DNA replication to occur?

1. DNA polymerase binds to the leading strand

2. DNA is unwound

3. Hydrogen bonds form between bases

4. Chromosomes condense

Question 29

A nucleotide consists of

1. a nitrogen base.2. a nitrogen base and a sugar.3. a nitrogen base, sugar, and

phosphate.4. two nitrogen bases, a sugar, and a

phosphate.

Question 30

The "rungs" of the DNA ladder are made of

1. phosphates & bases.2. sugars.3. sugars & phosphates.4. bases.

Question 31

A DNA strand has the following bases:

A A G C C A.

What are the bases on its complimentary strand?

1. A A G C C A

2. A C C G A A

3. T T C G G T

4. C C A T T C

Question 32

When onion cells are observed with a compound light microscope, which laboratory technique is used to make the nucleus more visible?

1. centrifugation

2. chromatography

3. microdissection

4. staining

Question 33

A student is investigating the internal organs of an earthworm. Which piece of equipment should the student use to move the intestine aside without damaging it?

1. a glass slide

2. a metric ruler

3. a dissecting needle

4. a dropping pipette

Question 34

Question 3What is the volume of water in the graduated

cylinder shown below?

1. 10.3 mL

2. 13.0 mL

3. 13.5 mL

4. 14.0 mL

Question 35

Question 3Which piece of laboratory equipment should a student

use to remove the legs of a preserved grasshopper for further study?

Question 36