Question

question completion status: ion channels are formed by a particular kind of membrane protein that allows the passage of a specific ion under certain conditions. this type of protein is most likely a(n) a. integral protein with a transmembrane domain. b. enzyme with an asymmetrical arrangement on either side of the plasma membrane. c. phospholipid with hydrophilic domains. d. peripheral protein with additional hydrophobic domains. question 5 active transport usually moves molecules a. in a direction that tends to bring about equilibrium. b. in a direction opposite to the one in which diffusion moves them. c. in the same direction as diffusion moves them. d. toward a higher ph. question 6 if there is a concentration gradient of glucose across a membrane, a. the glucose molecules are more numerous on one side of the membrane than on the other. b. there are larger molecules of glucose on one side of the membrane than on the other. c. there are more glucose molecules anchored to one side of the membrane than to the other. d. the glucose molecules are more tightly bonded to each other on one side of the membrane than on the other. click save and submit to save and submit. click save all answers to save all answers.

Explanation:

• Question 4: Ion channels are integral membrane proteins with transmembrane domains that allow specific ions to pass through the membrane under certain conditions. Enzymes are mainly for catalysis, phospholipids form the membrane bilayer and not the ion - channel proteins, and peripheral proteins are not embedded in the membrane like ion - channel proteins.
• Question 5: Active transport moves molecules against their concentration gradient, while diffusion moves molecules down their concentration gradient (from high to low concentration). So active transport moves molecules in a direction opposite to that of diffusion.
• Question 6: A concentration gradient of a substance (like glucose) across a membrane means there are more molecules of that substance on one side of the membrane than on the other.

Answer:

Question 4: A. integral protein with a transmembrane domain.
Question 5: B. in a direction opposite to the one in which diffusion moves them.
Question 6: A. the glucose molecules are more numerous on one side of the membrane than on the other.