Which of the following is true of adherens junctions?
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.
E
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Oxytocin is a hormone that is involved with increasing contractions during childbirth. The action is
binding to membrane receptors and the result is increasing sodium and calcium. Oxytocin is most likely a
a. peptide or protein. b. steroid. c. carbohydrate. d. prostaglandin. e. fatty acid derivative.
Which of the following describes the gel electrophoresis technique?
a. Separating molecules based on their size and charge b. Making multiple copies of DNA for further analysis c. Creating multiple copies and expressions of genes d. Modifying an organism’s DNA to achieve certain traits
The plant hormone that promotes dormancy in some plants and seeds is ____
a. abscisic acid b. auxin c. gibberellin d. ethylene e. cytokinin
Bully whippets are unable to synthesize:a
testosterone. b. growth hormone. c. estrogen. d. progesterone. e. myostatin