Exchange across a membrane requires

a. moisture only.
b. transport proteins only.
c. pressure gradients only.
d. moisture and pressure gradients only.
e. moisture, pressure gradients, and transport proteins.


D

Biology & Microbiology

You might also like to view...

A cluster of functionally-related genes that are regulated together and encoded into a single mRNA molecule is called a(n)  

A.  operon. B.  repressor. C.  promoter. D.  operator. E.  CAP.

Biology & Microbiology

Molecular biologists rely on many, often sophisticated, techniques to pursue their discipline. Ultracentrifugation, electron microscopy, X-ray diffraction, electrophoresis, and computer interfacing are fundamental tools

Model organisms provide the raw materials for study. List three organisms (or organismic groups) often used by recombinant DNA technologists and describe a major advantage of each group.

Biology & Microbiology

What are root nodules?

a. connecting points between branching roots b. symbiotic associations between a fungus and plant roots c. specialized root hairs d. localized swellings in plant roots filled with nitrogen-fixing bacteria

Biology & Microbiology

The lack of blood flow to an organ, as in the case of a blood clot blocking an artery, is termed ________

Fill in the blank(s) with correct word

Biology & Microbiology