Of the following molecules, which passes through a lipid bilayer most readily?
A. carbon dioxide
B. glucose
C. K+
D. arginine
E. RNA
A. carbon dioxide
B. glucose
C. K+
D. arginine
E. RNA
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Recall that several vascular bundles (containing phloem and xylem) are located around the circumference of a vascular plant stem. In contrast, a root contains one vascular bundle running down its center
What might account for this different arrangement of vascular bundles in stems and roots? A. Stems need to counteract the force of gravity (and support leaves), but roots do not. B. Roots need to quickly transport nutrients to the rest of the plant, but stems do not. C. Roots require less nutrients compared to stems.
Which of the following is a single-gene trait?
a. brown hair b. blue eyes c. height d. the widow's peak hairline e. All of the above are single-gene traits.
Which English economist predicted that the rapid growth of human populations would soon exceed Earth's capacity to support it?
A) Hutton B) Wallace C) Lyell D) Mendel E) Malthus
The first pair of walking legs in a crayfish, lobster, crab, and their relatives, that is enlarged with a terminal claw is the
a. Protopodite b. Statocyst c. Cheliped d. Pedipalp e. Exopodite