The pericardium, or pericardial sac
A. is a double-layered, closed structure.
B. anchors the heart in the mediastinum.
C. has a tough fibrous connective tissue outer layer.
D. has an inner layer of squamous epithelial cells.
E. has all of these characteristics.
Ans: E. has all of these characteristics.
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Sensitivity to allergens
a. may be triggered by stress. b. may be triggered by changes in air temperature. c. may be due to genetic predisposition. d. may be triggered by a and b only. e. may be due to genetic predisposition, and may be triggered by stress and by changes in air temperature.
The per capita growth rate (r) is ____ per mouse per month in a population of 1,000 mice where 500 mice are born
and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5
What organelle modifies new polypeptides and sorts proteins and lipids?
a. nucleus b. mitochondria c. peroxisomes d. lysosomes e. Golgi body
In thermodynamics, what does the term "free energy" refer to?
A.) energy that can be harnessed to do work or drive chemical reactions B.) energy that cannot be harnessed to do work or drive chemical reactions C.) energy required to initiate a chemical reaction D.) excess energy from a reaction that a cell does not use E.) energy that cells borrow from the environment