How do icefish transport oxygen in their blood for homeostatic purposes?
A. in red blood cells
B. in white blood cells
C. in platelets
D. in plasma
E. on hemoglobin
D. in plasma
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Which of the following is not true of eukaryotic signal transduction pathways that result in the regulation of gene expression?
A. The pathway frequently begins with a signal molecule binding to a cell surface receptor. B. The signal is transduced to the nucleus. C. They generally involve the localization of a protein. D. Signal molecules are always transported into the target cellular compartment.
Assume that in guinea pigs, dark brown fur (B) is dominant to black fur (b). If you mate a black guinea pig with a homozygous brown guinea pig, what proportion of the progeny will be homozygous?
A) none B) 1/4 C) 1/2 D) 3/4 E) all
A permanent, inheritable change in the genetic information is called ________.
A. an alteration B. translation C. a mutation D. regeneration E. transcription
Neuroglial cells
a. metabolically support other neurons. b. form sheaths around neurons and increase the rate of impulse transmission. c. form more than half of the volume of the brain. d. provide physical support. e. do all of these.