During muscle contractions, ____
a. the sarcomeres lengthen
b. the actin and myosin filaments slide in the same direction
c. the actin filaments move toward the middle of the sarcomere
d. the muscle fibers elongate
e. the muscle fibers are motionless
ANSWER: c
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Which of the following may be used as sources of energy by chemolithotrophs?
A. Reduced nitrogen compounds B. Reduced sulfur compounds C. Hydrogen gas D. All of the choices are correct.
Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide c. divide continuously and never transition to G0 d. mutate into other cell types by signals from bone marrow cells e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis
Four of the five choices below are components
of the human lymphatic system. Select the EXCEPTION.
a. spleen b. pancreas c. tonsils d. lymph nodes e. thymus
When genes are inserted into lung cells of cystic fibrosis patients, this kind of treatment is referred to as ________.
Fill in the blank(s) with the appropriate word(s).