A cross bridge is the binding of which two proteins?
A. actin and myosin
B. actin and troponin
C. myosin and troponin
D. collagen and troponin
E. myosin and collagen
A. actin and myosin
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Which of the following statements concerning the properties of ligands for intracellular receptor systems is correct?
A) Steroids are produced from cholesterol. B) Changes in the composition of your diet can affect the concentration of some of these ligands in your body. C) Some ligands are bound to specific proteins when carried in the blood. D) both choices A and C E) choices A, B, and C
Which of the following is a characteristic of
the plasma membrane?
a. it controls the contents of the cell b. the main lipid of a cell membrane is cholesterol c. carbohydrates carry out most of the cell’s dynamic functions d. it encloses a jellylike mixture called a cytoplastic reticulum e. all of these are characteristics of plasma membranes
Duchenne muscular dystrophy is caused by a
mutation of a gene on the ___ chromosome.
a. X b. Y c. 21st d. 1st e. 18th
The entrance into the cavity formed during gastrulation in sea stars and frogs is called the
a. archenteron. b. blastocoel. c. blastocyst. d. blastopore.