Underground stems with fleshy leaves used for storage of water and food are known as:
a. tendrils.
b. spines.
c. bulbs.
d. buds.
e. stipules.
C
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What percentage of oxygen in the air is typically extracted by the mammalian lung?
A. less than 25% B. 26–50% C. 51–75% D. 76–90% E. 91–100%
Which of the following statements about the bacterial ribosome is nottrue?
A. The 70S ribosome is a complex of 50S and 30S subunits. B. The entire protein component of the 30S subunit is a single polypeptide chain. C. Each ribosomal subunit contains at least one RNA molecule. D. An rRNA molecule, rather than protein, catalyzes peptidebond formation.
Which of the following does accurately describe the Lineweaver—Burk plot?
A) It is a double-reciprocal plot. B) The y intercept is equal to 1/Vmax. C) The x intercept is -1/Km. D) It is a linear plot. E) Its slope is the same as the Eadie—Hofstee plot.
Name four ways roots benefit a plant.
What will be an ideal response?