What will glycerin do to skeletal muscle fibers?
A) Adhere myosin heads to actin active sites
B) Block actin active sites
C) Remove ions and ATP so actin active sites are exposed
D) Increases calcium permeability
Answer: C
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Transcription occurs in the
A) mitochondrion. B) cytoplasm. C) vesicles. D) Golgi body. E) nucleus.
There are two types of proliferation, one for ________ and one for B-cells
A) Dendritic cells B) Lymphocytic cells C) Natural killer cells D) Effector T-cells
Assume that a membrane that is permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is much higher than on side 2 . Which of the following ionic movements will take place?
a. Na+ will move until its concentration gradient is dissipated (i.e., until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1). b. Cl- will move down its concentration gradient from side 1 to side 2. c. a membrane potential, negative on side 1, will develop. d. a membrane potential, positive on side 1, will develop. e. more than one of these answers.
The shape of the external ear is maintained by ________.
A) adipose tissue B) elastic cartilage C) hyaline cartilage D) fibrocartilage