Which process involves the movement of molecules or atoms down a concentration gradient across plasma membranes?
A) active transport
B) passive transport
C) exocytosis
D) endocytosis
B
You might also like to view...
Which of the following is a secondary sexual trait?
a. ovulation in females b. production of semen in males c. facial hair in males d. ovaries in a female e. testes in males
Which of the following human extraembryonic
membranes forms the urinary bladder? a. amnion b. yolk sac c. chorion d. allantois e. none of these
The major difference between the smooth and rough ER is that ____
a. smooth ER is isolated to the nucleus b. vesicles are found only in the smooth ER c. rough ER contains ribosomes d. smooth ER is the site of polypeptide synthesis e. rough ER is the site of lipid synthesis
Tracheal tubes and spiracles are characteristically found in annelids. Indicate whether the statement is true or false