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Bio 102
Spring 2010
Exam 4
Name: ______________________________
1. The death of hair cells in a specific region of the cochlea will result in …
a.
b.
c.
d.
color blindness
the inability to taste certain flavors
the inability to hear certain tones
a blind spot in the field of vision
2. The chromosome count of human gametes is ….
a.
b.
c.
d.
the same as the count in normal cell
half of the count of normal cells
twice the count of normal cell
unstable, gametes may have any number of chromosomes
3. The ____________ is the part of the brain that regulates fundamental body activities
like respiration rate
a.
b.
c.
d.
cerebrum
cerebellum
brain stem
Both A and B are correct.
4. The blind spot is the place where ….
a.
b.
c.
d.
the pupil interrupts the iris
the cornea attaches to the lens
the optic nerve enters the retina
cone cell density is greatest
5. Gated sodium channels are essential to the generation of ________
a.
b.
c.
d.
nerve impulses
sperm cells
neurotransmitters
All of the above are correct.
6. Consider the following case. Two brown-eyed parents produce a blue-eyed child. The
most likely dominance relationship between the blue allele and the brown allele for
eye color is ….
a.
b.
c.
d.
simple dominance
codominance
sex-linked inheritance
unidominance
7. The central nervous system is made up of ….
a.
b.
c.
d.
the nerves that service the internal organs
the nerves that service the skin
the brain and spinal cord
All of the above are correct.
8. Simple reflex arcs provide direct connections between …..
a.
b.
c.
d.
sense receptors and muscles
the cerebrum and the cerebellum
the cerebellum and the brain stem
the cerebrum and the brain stem
9. All sense organs convert ____________ into _______________.
a.
b.
c.
d.
pressure waves, action potentials
action potentials, neurotransmitters
dendrites, axons
environmental stimuli, patterns of neuron firing
10. Psychoactive drugs almost always affect ….
a.
b.
c.
d.
neuron sodium pumps
prostate function
sense receptor function
synaptic transmission
11. The sense receptors for touch (pressure) are located ….
a.
b.
c.
d.
right next to the spinal cord
in the skin itself
just below the skin
inside dermal (skin) blood vessels
12. Which of the following eye structures is closest to the retina?
a.
b.
c.
d.
cornea
lens
iris
eyelid
13. Consider the following case. A child has wavy hair, one parent has curly hair and the
other parent has straight hair. A geneticist would call the child’s phenotype
intermediate between the phenotypes of the two parents. The most likely dominance
pattern for this trait is ….
a.
b.
c.
d.
simple dominance
codominance
sex-linked inheritance
unidominance
14. The receptor cells of the eye are called ….
a.
b.
c.
d.
rods and cones
hair cells
Merkel’s cells
Panacean corpuscles
15. The auditory nerve connects to the ….
a.
b.
c.
d.
pinna
tympanic membrane
auditory ossicles
cochlea
16. Most of the prominent physical traits that we see when we look at people are the
result of …..
a.
b.
c.
d.
dominant genes
recessive genes
multiple genes interacting with each other
heterozygous genes
17. Most of the seminal fluid (semen) is produced by ….
a.
b.
c.
d.
the testes
the penis
accessory sex glands like the prostate
the vas deferens
18. The genetic instructions for a trait is called the _________ while the actual
appearance of the trait is called the ____________.
a.
b.
c.
d.
gene, chromosome
heterozygote, homozygote
genotype, phenotype
allele, locus
19. The fact that chromosomes exist in pairs explains how ….
a. the development of recessive traits is suppressed
b. there can be two copies of every gene for every trait.
20. The ________ is a neuron fiber that carries nerve impulses away from the cell body.
a.
b.
c.
d.
nerve
axon
dendrite
glia
Address the following with a short answer (5 pts each).
21. Briefly describe the respective roles of the retina and the brain in the process of
vision.
22. What part of the eye is changed by laser surgery for the correction of
nearsightedness? Why does changing the shape of this structure affect eye function?
23. Label the indicated structures (2 pts each).
A. ____________________________________________________
B. ____________________________________________________
C. ____________________________________________________
D. ____________________________________________________
E. ____________________________________________________
Address the following with a grammatically correct essay (20 pts).
24. Explain as completely as you can the roles that sodium ions, sodium pumps and gated
sodium channels play in the generation of resting potentials and action potentials. Use
some diagrams if you think they will help.