Gymnosperms are seed plants that produce seeds ____
a. inside ovules
b. on the surface of ovules
c. inside fruits
d. on their waxy needles
e. from a microspore
ANSWER: b
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A potential consequence of continued human population growth could be which of the following?
a. Humans change from exponential to logistic growth patterns. b. Carrying capacity of the planet will increase. c. Life expectancy decreases as resources become limited. d. Life expectancy increases as resource become more abundant.
Although Sulfolobus solfataricus grows at pH 2 to 4, it maintains a cytoplasmic pH of about 2, thereby generating a large pH gradient across the plasma membrane.
Answer the following statement true (T) or false (F)
According to IPCC predictions, the effects of climate change will be the most extreme in which of the following areas over the next century?
a) Polar areas b) The tropics c) Deserts at 30o latitude d) Climate change effects will be the same across the globe.
Cells are activated by the binding of their antigen and interaction with _____ cells.
A. helper T cells B. cytotoxic T cells C. macrophages D. natural killer cells