Which of the following is true of plasmodesmata?
A. They are holes in the cell wall through
which the plasma membrane and
endoplasmic reticulum of adjacent cells are
connected.
B. They are channels in the plasma
membrane of plant cells made of
transmembrane proteins that allow ions and
small molecules to pass between adjacent
cells.
C. They are channels in the plasma
membrane of animal cells made of
transmembrane proteins that allow ions and
small molecules to pass between adjacent
cells.
D. They provide points of structural support
between adjacent plant cells.
E. They provide points of structural support
between adjacent animal cells.
A
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Over twisting or under twisting of helical DNA generates
A. hypertwists. B. hypercoils. C. supercoils. D. hypotwists.
During bacterial conjugation, interrupted matings yielded the following information: leu 10 minutes, arg 8 minutes, str 15 minutes, and amp 12 minutes. Based on this information, the order of the genes, beginning at the origin, is
A) amp-arg-leu-str. B) str-amp-leu-arg. C) leu-arg-str-amp. D) arg-amp-leu-str. E) arg-leu-amp-str.
Asymmetry, choanocytes, filter feeding, osculum, and spicules are all terms associated with which
phylum?
a. Nematoda b. Ctenophora c. Nemertea d. Porifera e. Cnidaria
Which tubular organ takes up body fluid at one end and expels excess water and unwanted solutes at the other end?
a. nephron b. Malpighian tubes c. coelomic tubule d. kidney e. nephridium