Foot proteins
a. span the gap between a lateral sac of the sarcoplasmic reticulum and a T tubule
b. are believed to serve as Ca2+ channels
c. bind to and pull the thin filaments inward toward the A band's center during contraction
d. have characteristics a and b
e. are none of the above
D
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Which of the following describes a lysosome?
A) A double-membraned organelle that is the "powerhouse" of the cell B) A tiny, membranous sac that contains enzymes that degrade worn cell parts and debris C) A nonmembranous structure that is essential for mitosis D) A complex network of interconnected membranes that is a communication system in the cell
Which of these is an example of a hypertonic solution?
A. 200 mM NaCl B. 300 mM glucose C. 100 mM MgCl2 D. 400 mM urea E. 100 mM NaCl
During the early part of the menstrual cycle, ________ acts on granulosa cells, which ________. ________ acts on theca cells, which ________
A. LH; convert androgens to estrogens; FSH; synthesize androgens B. LH; synthesize androgens; FSH; convert androgens to estrogens C. FSH; convert androgens to estrogens; LH; synthesize androgens D. FSH; synthesize androgens; LH; convert androgens to estrogens E. progesterone; synthesize androgens; LH; secrete estrogens
Match the structure of the eye with the appropriate description.A. Photoreceptor cells that function in black and white visionB. Photoreceptor cells that function in color visionC. The opening in the irisD. The innermost tunic of the eyeE. A pigmented contractile structureRods
Fill in the blank(s) with the appropriate word(s).