A specialization of the stomach that aids in grinding for animals that lack teeth is the ____
a. crop
b. rumen
c. cloaca
d. gizzard
e. esophagus
ANSWER: d
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The time that it takes for half of a radioactive isotope to change into another stable element is its
A. chemical life cycle. B. half-life. C. activation time. D. life span.
DNA replication occurs
a. between the gap phases of interphase. b. immediately after cytoplasmic division. c. during prophase of mitosis. d. between mitosis and G1. e. after the S phase of interphase
A student has isolated a large compound (macromolecule) from cells. Chemical analysis of the compound shows that it is made up of the following elements: carbon, hydrogen, oxygen, nitrogen, and sulfur
To which group of macromolecules does this compound most likely belong? A) carbohydrate B) protein C) nucleic acid D) lipid E) aqueous
The movement of chemicals through ecosystems is known as
A. gross primary production. B. biogeochemical cycles. C. community ecology. D. net primary production. E. biomagnification.