Natural selection acts only on traits that are _____.
A. advantageous in a certain environment
B. disadvantageous
C. advantageous
D. heritable
Ans: D. heritable
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Microtubules that form the mitotic spindle tend to originate from or terminate in
a. centromeres and telomeres. b. euchromatin. c. centrioles and telomeres. d. the nuclear envelope. e. centrioles and kinetochores.
Which type of cellular proteins internally support the axopods of radiolarians?
a. microfilaments b. microtubules c. actin filaments d. lysosomal proteins
Match the type of circulatory system with the organism in which it is found.
A. Clams and oysters B. Grasshoppers C. Earthworms
Flying insects typically _____
A) decrease metabolism as much as 200-fold during flight B) switch from diffusion of tracheal gases to active transport during flight C) utilize high numbers of mitochondria in flight muscles D) generate fuel molecules from catabolism of carbon dioxide