The letter "A" in the accompanying figure represents ____
a. sclerenchyma fibers
b. parenchyma
c. xylem
d. epidermis
e. phloem
ANSWER: a
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What is the function of tropomyosin in muscle cells?
A. Tropomyosin binds to actin molecules and brings about shortening of the muscles. B. Tropomyosin covers the myosin binding sites on the actin molecules, preventing contraction from occurring. C. Tropomyosin is the contractile unit of the muscle cell. D. Tropomyosin stores calcium.
Which of these features is found in both nonvascular and vascular plants?
a. lignin b. roots c. cuticle d. xylem e. phloem
The main purpose of a probe is its insertion in plasmid DNA
Indicate whether the statement is true or false
You find a sick plant in an arid environment. After studying it, you believe it is specifically defective in C4 photosynthesis. What nutrient might this plant be lacking?
A. molybdenum B. sulfur C. nickel D. copper E. sodium