Lecture 21: Resource Transport

Question 1

1. Active transport involves all of the following except:
   A. Pumping of solutes across the membrane
   B. Transport of solute against a concentration gradient
   C. Diffusion of solute through the lipid bilayer of a membrane
   D. Hydrolysis of ATP

Answer 1

B. Transport of solute against a concentration gradient

Question 2

Where does the blood returning to the mammalian heart in a pulmonary vein first drain?
A. Left atrium
B. Vena cava
C. Right atrium
D. Left ventricle

Answer 2

C. Right atrium

Question 3

3. Phloem transport of sucrose is often described as going from source to sink. Which of the following would not normally function as a sink?
   A. Growing root
   B. Growing leaf
   C. Mature leaf
   D. Developing fruit

Answer 3

C. Mature leaf

Question 4

Which of the following statements about xylem is
incorrect?
A. It conducts material from root tips to leaves
B. It transports mainly sugars and amino acids
C. The conducting cells are part of the apoplast
D. No energy input is required for transport

Answer 4

D. No energy input is required for transport

Question 5

5. What is likely to be found in organisms with a circulating body fluid that is distinct from the fluid that directly surrounds the body’s cells?
   A. An open circulatory system
   B. Branched tracheae
   C. Hemolymph
   D. A closed circulatory system

Answer 5

D. A closed circulatory system