In skeletal muscle contraction, an increase in ____in the cytosol triggers the crossbridge cycle
a. troponin
b. Ca2+
c. tropomyosin
d. ATP
e. acetylcholine
ANSWER: b
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Movement of glucose through the membranes of the small intestine is primarily by:
a. osmosis b. bulk flow c. active transport proteins d. diffusion through the lipid bilayer e. glucose is not absorbed in the small intestine
The deepest layer of the skin is the stratum corneum
____________________ Indicate whether the statement is true or false.
Autoclaving is effective for most materials except for
A) proteins. B) enzymes. C) amino acids. D) oils.
James is a 42-year-old man with hemophilia, a sex-linked recessive condition. His daughter, Susan, who has normal blood clotting, is married to Fred who also has hemophilia. Susan and Fred are expecting their first child and an ultrasound shows that the fetus is male. What is the approximate probability that their new son will have hemophilia?
A. 1/4 B. 1/2 C. 1 (100%) D. 3/4 E. 2/3