In a healthy human, the typical life span of a red blood cell is
A) 24 hours.
B) one week.
C) one month.
D) four months.
E) 80 years or more.
Answer: D) four months.
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On the outer surface of the plasma membrane there are marker molecules that identify the cell type. Often these molecules are
A. ATP. B. amino acids. C. nucleotides. D. carbohydrate chains. E. inorganic ions.
The ocular (eyepiece) lens magnifies the image?
A. 10-fold B. 5-fold C. 15-fold D. 20-fold E. 25-fold
Cytological examination of resting and contracted muscle provides important support for the sliding filaments model for how skeletal muscle contracts. This evidence includes the observation that during contraction the
A) Z lines move farther apart. B) lengths of the thick filaments shorten significantly. C) lengths of the thin filaments shorten significantly. D) I bands get longer. E) H zone becomes narrower.
Gene conversion results from
A. discontinuous replication. B. photoreactivation. C. mismatch repair. D. SOS repair. E. excision repair.