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BIO 172 Final T/F
Terms in this set (30)
A tropic hormone acts on other endocrine glands to change the way they secrete
their own hormones
There are three blood vessels in the human body that begin and end in capillary beds.
Human chorionic gonadotropin is released by the hypothalamus and stimulates the
ovarian follicles to release estrogen.
3. F (hCG is released by the embryo to maintain the corpus luteum which in turn will
maintain the uterine lining to support the pregnancy)
There is a special portal system that carries releasing hormones from the
hypothalamus to the anterior pituitary.
Embryologically, the anterior pituitary derives from the mouth of the embryo
5. T (and migrates upwards to hit the posterior pituitary, which is neural tissue)
6. LDL is the so-called "good cholesterol," while HDL is the "bad cholesterol."
6. F (the opposite is true)
7 It is known that sex evolved as a way for a species to have a long-term flexibility in
its evolutionary potential.
7. F (evolution cannot anticipate future developments, except by chance; natural
selection occurs only by pressure of immediate selective agents, and adaptations are
for the present or continue into the present from the evolutionary past)
8. Your body makes many (hundreds of thousands) of different kinds of B cells that have
different antigen receptor proteins on the surface, each cell potentially binding only one
particular antigen; cloning of the B cell occurs only after it encounters the antigen it can bind to
and is also stimulated by a helper T cell.
8. T (the number of different possible receptors has been calculated at more than three million)
9. The cells responsible for smell in humans are neurons, unlike the sensory cells responsible for
detection of light, hearing or taste
10. Horizontal and amacrine cells inhibit more distant photoreceptor and ganglion cells
(respectively) and thereby enhance contrast of the image.
11. Afferent neurons transmit nervous signals from the brain to cells/organs outside
of the central nervous system.
11. F (afferent = towards; efferent = away from)
12. Schwann cells cover the axon of nerve cells outside the central nervous system
with a kind of insulation that increases nerve signal conduction rates.
13. Whole muscles consist of myofibers, within which there are myofibrils and
14. Upwellings of cold water from the bottom of the ocean is a cause of the dead
ocean zones found in some parts of the world.
14. F (upwellings bring nutrients to the surface and give rise to great abundance of
sea life; some great fisheries at upwellings have been destroyed by humans through
15. The pelagic zone is the area of open ocean far from the influence of shore.
15. T (generally true, but this region does not have to be too far from the shore)
16. The Koolaus lie in the rain shadow of the Waianae Mountains.
17. Coral reefs are unusual in that they are an ecosystem formed physically by
animals instead of plants.
18. The Arctic and Antarctic Circles are places where at the height of summer (the
summer of that hemisphere) the sun does not set, and at the height of winter (that
hemisphere's winter) the sun does not rise
19. Tropical rainforests have rich soils, unlike those of grasslands
19. F (grasslands have very rich top soils, in general, while rainforests have their
nutrients washed out of the upper soil by high rains; so in rainforests the nutrients are
locked up in the trees and in very deep soil)
20. Biological magnification means that you are more likely to get certain kinds of
fish poisoning by eating fish that are top predators than by eating fish that are low in
the food chain
21. Energy can be recycled through the ecosystem.
22. Nitrogen fixation creates ammonia from decay of dead bodies by decomposers.
22. F (Production of ammonia from the breakdown of dead bodies is known as ammonification;
this is not clear in the book)
23. Trophic efficiency (% of energy on one trophic level that passes to the next higher
trophic level) averages about 90%.
24. The intrinsic rate of population growth, r, can remain above zero indefinitely
without any serious problems.
25. Scientists have discovered a human fingerprint on warming of the atmosphere by the use of
26. Denitrification takes nitrates and changes them to nitrogen gas.
27. Plants cannot pick up the vast stores of nitrogen gas in the atmosphere and fix them into
organic molecules in their bodies.
28. CO2 levels in the atmosphere that we have seen in the last few decades have not been this
high in over the previous 800,000 years.
29. You can support more people in an area by feeding them meat raised in that area than you
can by feeding them just plant material grown in that same area.
30. Denitrification turns ammonia into nitrates.
30. F (it turn nitrates to nitrogen gas)
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