What type of cells are joined end-to-end, conduct water, and are connected to each other with strips of wall material?
A. Sieve cells
B. Tracheids
C. Companion cells
D. Vessel members
E. Sieve tube members
Answer: D
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Length is the measurement of
(a) a line, extending from one point to another. (b) the space an object occupies. (c) the quantity of matter present in an object. (d) the degree of hot or cold of an object.
Which gland(s) secretes epinephrine and norepinephrine?
1.Adrenal cortex 2.Adrenal medulla 3.Anterior pituitary 4.Pineal gland
Phospholipids spontaneously form a bilayer in an aqueous solution. Why do the heads of the phospholipids point out and the tails point toward one another?
A) The tails are nonpolar and form hydrogen bonds with one another. B) The heads are repelled by the water inside and outside the cell. C) The tails are repelled by the aqueous environment, and the heads will directly interact with the aqueous solution.
An organism has one Z chromosome and one W chromosome. That organism is
A. a female bird. B. a male insect. C. a female insect. D. a male or female human. E. a male bird.