What major factor limits cell size?
a. The rate at which it can process nutrients
b. The rate at which it can remove wastes
c. The size of the nucleus
d. The surface area to volume ratio
e. The size of the plasma membrane
ANSWER: d
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What is the function of the umbilical cord?
What will be an ideal response?
Chapter 12 includes a discussion of the various defense mechanisms utilized by plants. Onion
plants have developed several creative means of discouraging their consumption by herbivores. The cells of the edible portion of the onion contain several different substances:alliinase (an enzyme) and sulfur compounds derived from the soil. When the cells of the onion are ruptured (as when they are bitten into by an animal), the substances combine. From your knowledge of onions, how would the new substance created by this combination deter its future consumption?
What will be an ideal response?Meeting the needs of the present generation without reducing the ability of future generations to meet their own needs is the goal of
a. sustainability b. ecology c. conservation biology d. sociology e. biology
Cri-du-chat syndrome results from a(n)
a. deletion. b. inversion. c. translocation. d. duplication. e. aneuploidy.