Which of the following systems is NOT directly involved with regulation and maintenance of the body's chemistry?
A. the respiratory system
B. the circulatory system
C. the digestive system
D. the reproductive system
E. the urinary system
Answer: D
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Most of the significant changes in activities and functions that accompany passage through a cell cycle checkpoint are regulated by the:
A. activation of microtubules. B. changes in membrane polarization. C. activation of kinase enzymes. D. activation of DNA polymerase. E. inhibition of cyclin proteins.
The first living cells were most likely
A. aerobic, photosynthetic, eukaryotic. B. aerobic, photosynthetic, prokaryotic. C. anaerobic, heterotrophic, prokaryotic. D. anaerobic, heterotrophic, eukaryotic. E. anaerobic, chemotrophic, eukaryotic.
Which fish has a sharp spearlike point at the tip of their tail that defends them against predators and sometimes secretes venom?
a. lamprey b. hagfish c. sharks d. stingrays e. lungfish
Homeotic genes of Drosophila:a
cause cells of the same type to produce differing amounts of gene products. b. specifies the developmental plan for each part of each segment. c. are expressed in only one sex in any particular species. d. when mutated, cause body parts to be duplicated. e. control developmental timing.