Valleys are usually ________ than nearby hilltops because ________
A) warmer; they receive more solar irradiance
B) cooler; they usually hold a body of cool water
C) cooler; cool air is heavier than warm air
D) warmer; warm air is heavier than cool air
C
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There are 92 chromosomes in a normal human cell undergoing mitosis at the anaphase stage. Indicate whether the statement is true or false
All animals, whether large or small, have _____
A) an external body surface that is dry B) a basic body plan that resembles a two-layered sac C) a body surface covered with hair to keep them warm D) most of their cells in contact with an aqueous medium
An unknown bacterial species is recovered from a sick patient's digestive tract. It has a membrane outside the cell wall that contains toxic lipids. This observation indicates that
A) the infection should be relatively easy to control with common antibiotics, because the pathogen is a gram-positive species. B) the infection should be relatively easy to control with common antibiotics, because the pathogen is a gram-negative species. C) the infection may be quite threatening and difficult to control, because the pathogen is a gram-positive species. D) the infection may be quite threatening and difficult to control, because the pathogen is a gram-negative species.
Where does most new membrane synthesis take place in a eukaryotic cell?
(a) in the Golgi apparatus (b) in the endoplasmic reticulum (c) in the plasma membrane (d) in the mitochondria (e) on ribosomes