A reduction division is one in which
A. the chemical reactions of oxidation and reduction take place.
B. the daughter cells receive only half as many chromosomes as the parent cell had.
C. one daughter cell is substantially reduced in size compared to the parent cell.
D. the size of chromosomes is reduced from double-stranded to single-stranded.
B
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Arrange the following steps of muscle fiber contraction in the correct sequence
1. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released. 2. Thin filaments are pulled over the thick filaments. 3. Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites. 4. The impulse arrives at the synapse and travels through the transverse tubules. 5. The muscle fiber shortens and contracts. 6. Myosin heads bind to exposed active sites on actin, forming cross-bridges. 7-30-2013 A) 4, 1, 3, 2, 6, 5 B) 4, 1, 3, 5, 6, 2 C) 4, 1, 3, 6, 2, 5 D) 4, 3, 6, 2, 5, 1
Select the correct statement about diffusion
a. it depends on the random motion b. it involves active forces. c. its rate increases as the temperature decreases. d. molecules move from a lower concentration to a higher concentration. e. the chemical gradient of a substance does not affect it.
Which of the following is NOTÂ part of the alimentary canal?
A. Rectum B. Pancreas C. Duodenum D. Esophagus
Which of the following types of joints lacks a joint cavity and is held together by a fibrous connective tissue?
1. Fibrous joints 2. Cartilaginous joints 3. Synovial joints a) 1 only b) 2 only c) 3 only d) 1 and 2 e) All of these choices