Which of the following statements is NOT true of protistan cysts?
A. They may arise from asexual reproduction.
B. They may arise from sexual reproduction.
C. Their consumption can lead to human health problems.
D. They facilitate the spread of pathogens from one host to another.
E. They attach to host cells by small hooks.
E. They attach to host cells by small hooks.
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The diversity of our native grassland species is in decline. Restoration ecologists working to restore native grasslands are experimenting with combinations of burning and grazing to simulate natural conditions and increase species diversity
According to Joseph Connell, what level of burning and grazing should ecologists aim for? A. Strong enough to limit interspecific competition, but not strong enough to limit the number of species that can tolerate the environment. B. Strong enough to promote interspecific competition and niche diversification, but not strong enough to promote competitive exclusion. C. Strong enough to promote indirect competition, but not strong enough to promote direct competition. D. Strong enough to selectively favor one or more keystone species, but not strong enough to favor their competitors. E. None of these.
Carbon has an atomic number of 6. Carbon-14 has _____
a. 6 neutrons and 6 protons b. 6 neutrons and 8 protons c. 8 neutrons and 6 protons d. 14 neutrons and 6 protons e. 14 protons and 6 neutrons
On day 21 of the menstrual cycle, most progesterone is secreted by the _______ in the ovary.
Fill in the blank(s) with the appropriate word(s).
Which statement is accurate about how C4 plants are able to survive hot dry spells during the growing season?
A) When the stomata CLOSE during heat stress RuBP carboxylase is NOT exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to AVOID photorespiration. B) When the stomata CLOSE during heat stress RuBP carboxylase is exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to AVOID photorespiration. C) When the stomata OPEN during heat stress RuBP carboxylase is NOT exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to AVOID photorespiration. D) When the stomata CLOSE during heat stress RuBP carboxylase is exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to UNDERGO photorespiration. E) When the stomata OPEN during heat stress RuBP carboxylase is NOT exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to UNDERGO photorespiration.