During DNA replication, each new strand begins with a short
A. amino acid primer.
B. DNA primer.
C. lipid primer.
D. RNA primer.
E. hydrophilic primer.
Answer: D
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The ____ is to flagellated protozoans as the
____ is to prokaryotes.
a. cytoskeleton; flagellum b. endoplasmic reticulum; ribosome c. fimbriae; Golgi body d. pellicle; cell wall e. cytoskeleton; plastid
Four of the five choices listed below contain genetic
material. Select the exception. a. bacteriophage b. bacteria c. prion d. viroid e. virus
Organisms maintain dynamic homeostasis (internal balance) through behavioral and physiological mechanisms. Which of the following statements is an accurate explanation of a negative feedback mechanism used by animals to regulate body temperature?
A) Squirrels are able to cool themselves during warmer months by producing more brown fat, which contains abundant mitochondria and a rich blood supply. B) Desert jackrabbits have unusually large ears that serve as solar heat collectors to enable them to maintain their body temperatures. C) A ground squirrel's hypothalamus detects changes in environmental temperatures and responds by activating or suppressing metabolic heat production. D) A goldfish slows its movements when the water temperature is lower.
Which of the following is not true of the light-dependent reactions of photosynthesis?
A. They generates NADPH. B. Photons cause magnesium to release electrons. C. ATP is generated by a chemiosmotic mechanism. D. They occur in the thylakoid membranes. E. They generate glucose from CO2 and H2O.