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Biology exam questions & answers1: Which of the following statements concerning platelets is
INCORRECT. Platelets:
a) contain DNA
b) are roughly disk-shaped
c) have little ability to synthesize proteins
d) are between 1/2 and 1/3 the diameter of the red cell
ANSWER: A -- contain DNA
2: What is the primary function of the platelets in huma blood?
ANSWER: clotting or blocking leaks from blood vessels
3: When a wound occurs in humans, the platelets in th blood activate a
substance which starts the clotting process. The substance which starts the clotting is:
a) adenosine (pron: ah-den-ah-seen)
b) histamine
c) lecithin (pron: less-ah-thin)
d) thrombin
ANSWER: D -- Thrombin
4: When looking at the cross section of the human tibia, one finds the
RED marrow in the:
a) medullary cavity
b) cancellous bone
c) periosteum
d) epiphysis
ANSWER: A -- medullary cavity
5: Lengthening of long bones in humans occurs in a particular area of
the bone. This area is called the:
a) medullary canal
b) cancellous bone
c) periosteum (pron: per-E-ahs-tee-em)
d) epiphysis (pron: eh-pif-eh-sis)
ANSWER: D -- Epiphysis
6: The part of the human brain which is an important relay station for
the sensory impulses and also is the origin of many of the involuntary acts of the eye such as
the
narrowing of the pupil in bright light is the:
a) hypothalamus
b) midbrain
c) corpus callosum
d) cerebellum
ANSWER: B -- Midbrain
7: In the human brain, body temperature, metabolism, heart rate, sexual
, development, sleep and the body's use of fat and water are influenced by this region of the
brain.
This region of the brain is the:
a) hypothalamus
b) midbrain
c) corpus callosum
d) cerebellum
ANSWER: A -- hypothalamus
8: In which cerebral lobes is the speech center located? Is it the:
a) frontal
b) parietal
c) temporal
d) occipital
ANSWER: A -- frontal
9: In most axons, the myelin sheath is interrupted at intervals of about 1
millimeter or more. These interruptions are called the:
a) glial
b) nodes of Ranvier (pron: ron-vee-ay)
c) collaterals
d) nodes of Babinet
ANSWER: B -- Nodes of Ranvier
10: The order of insects which includes beetles is known as:
a) Coleoptera (pron: kO-lee-op-teh-rah)
b) Orthoptera (pron: or-tho-op-teh-rah)
c) Hymenoptera (pron: high-meh-nop-teh-rah)
d) Diptera (pron: dip-teh-rah)
ANSWER: A -- Coleoptera
11: This major protein component of connective tissue in mammals
comprises most of the organic matter of skin, tendons, bones, and teeth, and occurs as fibrous
inclusions in most other body structures. Is this material:
a) elastin
b) collagen
c) fatty acids
d) keratin
ANSWER: B -- collagen
12: Sickle cell anemia and Huntington's chorea are both:
a) virus-related diseases
b) bacteria-related diseases
c) congenital disorders
d) none of the above
ANSWER: C -- Congenital Disorders
13: In most species of Paramecium there are how many contractile
vacuoles? Is it:
a) one
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