The sliding filament model
a. supplies the energy needed for muscle contraction.
b. provides a flexing action for the muscle fibers.
c. describes the action of the actin and myosin in a muscle cell.
d. explains muscle fatigue.
e. only explains how muscles contract, not how they relax.
C
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Which letter in the figure above corresponds to a large influx of Na+ ions into the cell?
A) A B) B C) C D) D E) E
What is the map distance between sn and ct?
In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild-type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn and ct+ is crossed to a sn+ct male. The F1 flies are interbred. The F2 males are distributed as follows:
A) 12 m.u.
B) 13 m.u.
C) 25 m.u.
D) 50 m.u.
E) 75 m.u.
A chromosome inherited from the male parent is called the
1.sex chromosome. 2.homologous chromosome. 3.sister chromatid. 4.paternal chromosome. 5.maternal chromosome.
What are the tiny, absorptive structures on the root cells near the root tip?
A) taproots B) rhizomes C) root hairs D) root buds