Intercalated disks are gap junctions between cells of:
a. smooth muscle tissue.
b. skeletal muscle tissue.
c. cardiac muscle tissue.
d. osteocytes.
e. cartilage.
c
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A plant has the following characteristics: a taproot system, several growth rings evident in a cross section of the stem, and a layer of bark around the outside. Which of the following best describes the plant?
A) herbaceous eudicot B) woody eudicot C) woody monocot D) herbaceous monocot E) woody annual
How do photoreceptors regenerate inactive cis-retinal?
a. The cell degrades the active form and synthesizes new, inactive proteins. b. Enzymes convert trans-retinal back to the inactive conformation c. trans-retinalreverts back to the inactive state on its own.
d. Active trans-retinal is digested by proteases to regenerate the inactive form. e. The mechanism is not known.
What is the most common fatal genetic disorder in the U.S.?
a. Cystic fibrosis b. Huntington's disease c. Parkinson's d. Diabetes e. Down's syndrome
Which of the following functions best explains the reason for the asymmetrically oriented structure of
the proteins in the cell membrane? a. These proteins are manufactured by free ribosomes. b. Each type of protein has its own function. c. These proteins pass through the ER membrane into the ER lumen. d. Enzymes are needed to modify the carbohydrate chains on these proteins. e. These proteins are initially formed by ribosomes on the rough ER.