____ cells are alive at maturity and have primary cell walls that are especially thick at the corners
a. Sclerenchyma
b. Collenchyma
c. Parenchyma
d. Phloem
e. Xylem
b
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Which one of the following is a characteristic of complex multicellular organisms, but not simple multicellular organisms?
A. the functional specialization of subsets of cells in the organism B. the use of cell-adhesion molecules to allow cells to adhere to one another C. the presence of a single cell with multiple nuclei D. the presence of cells that are not in direct contact with the external environment
The hypothesis that life developed from nonliving matter is known as:
a. abiotic evolution. b. chemical evolution. c. natural selection. d. organic evolution. e. inorganic evolution.
Roughly speaking, (1) one gram of carbohydrate is the equivalent of how many Calories? (2) one gram of fat is the equivalent of how many Calories? (3) one gram of protein is the equivalent of how many Calories?
A. (1) = 4, (2) = 9, (3) = 4. B. (1) = 7, (2) = 9, (3) = 4. C. (1) = 4, (2) = 4, (3) = 4. D. (1) = 4, (2) = 10, (3) = 4.
The internal urinary sphincter is made of __________ muscle and under __________ control.
A. skeletal, voluntary B. skeletal, involuntary C. smooth, voluntary D. smooth, involuntary