Fleas
A. may transmit Yersinia pestis.
B. may transmit Lyme disease.
C. may transmit a toxin.
D.
have only one host, humans.
A
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Synthesizing a single glucose molecule requires the amount of energy stored in 54 ATP molecules, but when that glucose molecule is broken down, only enough energy to produce 36 to 38 ATP molecules is released. What happened to the remaining energy?
a. The extra energy is stored as adenosine diphosphate. b. Glucose molecules are never completely broken down. c. Some energy from metabolism is released as heat. d. Enzymes involved in this reaction absorb the extra energy.
Species with an equilibrium, or K-selected, life history strategy
A. have only a few offspring. B. are short-lived. C. reproduce at an early age. D. give very little care to their offspring. E. have a large number of offspring.
The skeletal and circulatory systems are produced by
a. the ectoderm. b. the endoderm. c. the mesoderm. d. two of the germ layers. e. all of the germ layers.
The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called
A) asexual reproduction. B) sexual reproduction. C) regeneration. D) spontaneous generation.