Please assist me with my homework. Can you help me with my

26 Jun Please assist me with my homework. Can you help me with my

Question
CHAPTER 15 ENZYMES

1. Which of the following will cause the rate of enzyme activity to increase linearly?
a.
b.
c.
d.

increasing
increasing
increasing
increasing

the
the
the
the

enzyme concentration
substrate concentration
temperature
pH

2. Which of the following will the cause the rate of enzyme activity to first increase and then level
off?
a.
b.
c.
d.

increasing
increasing
increasing
increasing

the
the
the
the

enzyme concentration
substrate concentration
temperature
pH

3. Which of the following can cause enzyme activity to either increase or decrease?
a. changing the temperature
b. changing the pH

c. both a and b
d. neither a nor b

4. Which of the following can cause enzyme activity to either increase or decrease?
a.
b.
c.
d.

increasing the substrate concentration
changing the pH
both a and b
neither a nor b

5. In which type of inhibition is it possible to restore the maximum rate of enzyme activity by
adding additional substrate?
a. cooperative inhibition
b. competitive inhibition

c. noncompetitive inhibition
d. selective inhibition

6. In which type of inhibition is it not possible to restore the maximum rate of enzyme activity by
adding additional substrate?
a. cooperative inhibition
b. competitive inhibition

c. noncompetitive inhibition
d. selective inhibition

7. Which of the following is often true of the active site of an enzyme?
a.
b.
c.
d.

It consists of amino acids near both the N-terminus and C-terminus.
It consists of amino acids which are adjacent to each other.
It consists of amino acids which not adjacent to each other.
None of the above is true.

8. Consider the following reaction.

Which classification would be correct for the enzyme that catalyzes this reaction?
a. oxidoreductase
b. isomerase
c. transferase
d. ligase
e. hydrolase
9. Consider the following image depicting enzyme behavior.

Which of the following correctly characterizes the components of this model?
a. A – enzyme, B – substrate, C – active site, D – E-S complex
b. A – substrate, B – active site, C – enzyme, D – E-S complex
c. A – active site, B – substrate, C – E-S complex, D – enzyme
d. A – substrate, B – enzyme, D – E-S complex, D – active site

10. Examine the following graph.

Which of the following explains why the line on the graph does not continue in a linear
fashion?
a. All of the added substrate is bound to the enzyme.
b. All of the enzyme active sites are occupied.
c. The amount of enzyme present is greater than needed by the substrate.
d. An inhibitor is present.
CHAPTER 16 CHEMICAL COMMUNICATIONS: NEUROTRANSMITTERS AND HORMONES
1. Which of the following is the hair-like part of a nerve cell?
a. the axon
b. a dendrite

c. the synapse
d. the vesicle

2. What name is used from the gap between the tip of a nerve cell and its target?
a. axon
b. dendrite

c. synapse
d. vesicle

3. Which of the following is used to characterize a material as either a neurotransmitter or a
hormone?
a. its chemical composition
b. its physiological behavior

c. both a and b
d. either a or b

4. Which of the following hormones is not produced in the pancreas?
a.
b.
c.
d.

insulin
glucagon
renin
None, they are all produced in the pancreas.

5. By which of the following mechanisms do steroid hormones cross plasma membranes?
a. active transport
b. diffusion

c. both a and b
d. neither a nor b

6. Which of the following is true of the receptors for steroid hormones?
a.
b.
c.
d.

They are hydrophobic.
They are proteins.
both a and b
neither a nor b

7. Which number represents the axon?

a.
b.
c.
d.

1
2
3
4

8. Which number represents the dendrites?

a.
b.
c.
d.

1
2
3
4

9. Which of the following distinguishes a neurotransmitter from a hormone?
a.
b.
c.
d.

the
the
the
the

diversity of compounds in the classification
chemical structure of the compounds
source of the compound
distance over which it acts

10. Which of the following correctly classifies the following chemical messenger?

a.
b.
c.
d.

cholinergic
amino acid
androgenic
peptidergic
CHAPTER 17 NUCLEOTIDES, NUCLEIC ACIDS, AND HEREDITY

1. Ribosomes are made up of how many subunits?
a. 1
b. 2

c. 3
d. 4

2. Which of the following is true of the lagging strand?
a.
b.
c.
d.

It
It
It
It

is
is
is
is

produced
produced
produced
produced

more rapidly than the leading strand.
at the same rate as the leading strand.
continuously.
discontinuously.

3. Which of the following is true of the two daughter strands of DNA?
a. They are both synthesized continuously.
b. They are both synthesized discontinuously.
c. The lagging strand is synthesizes continuously, but the leading strand is synthesized
discontinuously.
d. The leading strand is synthesizes continuously, but the lagging strand is synthesized
discontinuously.
4. Why is replication called semiconservative?
a.
b.
c.
d.

Only some of the leading strand is conserved.
Only some of the lagging stand is conserved.
Each new molecule of DNA contains one template stand and one daughter strand.
All of the above are correct.

5. Which of the following is true of primers that are used by the cell during DNA replication?
a.
b.
c.
d.

They
They
They
They

are
are
are
are

made out of DNA.
made out of RNA.
made out of either DNA or RNA.
proteins.

6. Which type of enzyme is important in DNA fingerprinting?
a. helicases
b. ligases

c. proteases
d. restriction enzymes

7. Which of the following experimental techniques is used in DNA fingerprinting?
a. centrifugation
b. diffraction

c. electrophoresis
d. inking

8. Which of the following correctly classifies this substance?

a.
b.
c.
d.
e.

nucleic acid
nucleoside
nucleotide
purine base
pyrimidine base

9. Which of the following correctly classifies this substance?

a.
b.
c.
d.
e.

nucleoside
nucleotide
nucleic acid
purine base
pyrimidine base

10. Which of the following correctly gives the letter sequence that would replace the numbers 1 – 4,
respectively, in the following segment of DNA?

a.
b.
c.
d.

AGTC
TCAG
UCAG
CTGA

CHAPTER 18 GENE EXPRESSION AND PROTEIN SYNTHESIS

1. Which of the following is true of mutations?
a.
b.
c.
d.

They will always cause a genetic disease.
They are always fatal.
They are never fatal.
Some are harmless and some quite dangerous.

2. Which type of radiation is capable of causing a mutation?
a. microwaves
b. radio waves

c. ultraviolet light
d. all of these

3. Which of the following describes a plasmid?
a.
b.
c.
d.

It is a circular loop of double stranded DNA.
It is a left handed double helix of DNA.
It is a single stranded DNA.
None of these is correct.

4. Restriction endonucleases do which of the following?
a.
b.
c.
d.

cleave DNA at very specific locations based on the sequence of bases
limit which bases can be at the ends of a strand of DNA
remove specific codons DNA
remove specific exons from DNA

5. How many sticky ends are produced if a certain restriction endonuclease cleaves a plasmid at
three different locations ?
a. 3
b. 6

c. 8
d. 9

6. The restriction endonuclease TaqI recognizes the sequence TCGA and cuts it between T and C
on both strands. What sticky ends will be produced when TaqI cuts the sequence which
follows?

a.

c.

b.

d.

7. The restriction endonuclease EcoRI recognizes the sequence GAATTC and cuts it between G
and A on both strands. What sticky ends will be produced when EcoRI cuts the sequence
which follows?

a.

c.

b.

d.

8. The following block diagram is a representation of the general cases of the central dogma of
molecular biology.

Which of the following correctly assigns a name to the numbered boxes?
a. 1- DNA, 2-RNA, 3-Protein
c. 1-RNA, 2-DNA, 3-Protein
b. 1-Protein, 2-RNA, 3-DNA
d. 1-DNA, 2-Protein, 3-RNA
9. The following generalized reaction is used in one of the techniques for synthesizing
recombinant DNA.

What type of enzyme is needed for reaction?
a. DNA ligase
c. peptidyl transferase
b. restriction endonuclease
d. DNA synthetase

10. Consider the following image.

Which of the following substances has this structure?
a. mRNA
b. tRNA
c. rRNA