In sexual reproduction, two __________ fuse to form a __________
a. gametes; zygote
b. eggs; embryo
c. sperm; zygote
d. gonads; embryo
A
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Different types of proteins are found on the surface or embedded in the plasma membrane of a
cell. Which of the following is a function of these proteins?
a. to transport substances b. to receive signals from the nervous system c. to allow for recognition among cells d. all of these
Specialized islet cells that secrete hormones are found scattered throughout the
a. adrenal cortex. b. liver. c. thymus. d. adrenal medulla. e. pancreas.
Genetic material is exchanged in Prophase I of meiosis during ____________ _______.
Fill in the blank(s) with the appropriate word(s).
The basic structural polysaccharide of fungal cell walls, crab shells, and insect exoskeletons is
a. cellulose. b. chitin. c. collagen. d. hemicellulose.