Which cell organelle regulates the movement of molecules in and out of the cell?
a. the nucleus
b. the ribosome
c. the plasma membrane
d. the cytoplasm
Ans: c. the plasma membrane
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Which type of molecular movement is a passive process
A) sodium-potassium pump B) endocytosis C) exocytosis D) diffusion E) active transport
John Hoogland (1998 ) studied Gunnison's prairie dogs (Cynomys gunnisoni) and observed that an increase in litter size was observed when females ________
A) chose males that were the largest in the colony B) mated with more than one male C) extended the time of copulation with individual males D) established a large territory for mating
What results when the surfactant in the lungs is affected by smoking?
A) increased respiratory surface area B) decreased gas exchange in the alveoli C) reduced ability of hemoglobin to carry oxygen D) increased concentrations of carbon monoxide
An eight-year-old girl has scabs and pus-filled vesicles on her face and throat. Three weeks earlier she had visited her grandmother, who had shingles. What infection does the eight-year-old have?
A) chickenpox B) measles C) fever blisters D) scabies E) rubella