Which of the following can cross the plasma membrane because of its selective permeability?
A. large, nonpolar molecules
B. glycoproteins
C. gases such as oxygen and carbon dioxide
D. large, polar molecules
E. ions
Answer: C
You might also like to view...
Microbes such as Lactobacillus acidophilus colonize the human vagina by fermenting ________.
A. sucrose B. lactose C. glycogen D. glucose
The letter “A” from above represents which of the
following? a. the excretory pore b. malpighian tubules where uric acid is taken up from blood and excreted c. sexual reproductive organ d. cilia which flick to throw interstitial fluid out of the organism e. none of these
Protozoa are primarily
A) free-living. B) pathogenic. C) parasitic. D) photosynthetic.
Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.
A. physiological breakdown of the chemical into harmless products B. transport of toxins absorbed by the roots into the shoots, where they can be collected more easily C. root pressure pushing toxins from deep in the soil towards the surface D. secretion of a substance from the roots that breaks down the toxic chemical E. "storage" of a toxic chemical in plant tissues, which are then removed from the site