Humans clear forests to grow crops, and they build houses and cities. What are these an example of?
A. how humans modify the biosphere
B. how humans preserve ecosystems
C. how humans do not need the rest of life on Earth
D. the high value humans place on biodiversity
E. the positive impact of humans on life on Earth
Answer: A
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Enzymes _____
A) increase the rate of a reaction by making the reaction more exergonic B) increase the rate of a reaction by lowering the activation energy barrier C) increase the rate of a reaction by reducing the rate of reverse reactions D) change the equilibrium point of the reactions they catalyze E) make the rate of a reaction independent of substrate concentrations
Which are members of the family Hominidae? Check all that apply.
_____ orangutans _____ humans _____ gorillas _____ chimpanzees _____ monkeys
Four of the following plants aremonocots. Which one is the exception?
a. orchid b. wheat c. maple d. grass e. palm
Anthers produce
a. ovules. b. seeds. c. megaspores. d. nectar. e. none of these.