An individual transport vesicle________
(a) contains only one type of protein in its lumen.
(b) will fuse with only one type of membrane.
(c) is endocytic if it is traveling toward the plasma membrane.
(d) is enclosed by a membrane with the same lipid and protein composition as the membrane of the donor organelle.
Choice (b) is correct. An individual vesicle may contain more than one type of protein in its lumen [choice (a)], all of which will contain the same sorting signal (or will lack specific sorting signals). Endocytic vesicles [choice (c)] generally move away from the plasma membrane. The vesicle membrane will not necessarily contain the same lipid and protein composition as the donor organelle, because the vesicle is formed from a selected subsection of the organelle membrane from which it budded [choice (d)].
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Which of the following statements is true?
A. Tracheids are multicellular conduits, whereas vessels are unicellular conduits. B. Tracheids transport water, whereas vessels transport sugars. C. Tracheids are short and thin, whereas vessel elements are much wider. D. Tracheids compose the xylem, and vessel elements compose the phloem. E. Water enters tracheids through pits, whereas water enters vessels only through spaces between the cells.
A neuron's __________ receive signals, and its __________ transmits signals. Fill in the blank(s) with the appropriate word(s)
Insects are members of the group
A) Arthropoda. B) Arachnida. C) Mollusca. D) Annelida. E) Echinodermata.
The immotile sperm develop motility in about 18 hours after arriving at the long, coiled tube called the
A. epididymis B. testis C. seminiferous tubules D. vas deferens