If active transport establishes a concentration gradient with the use of ATP, then the concentration gradient can be looked at as ________
A) potential energy that can be harnessed when molecules passively diffuse down the concentration gradient
B) a byproduct of active transport that will be alleviated by pinocytosis
C) an unusable byproduct of active transport that will simply diffuse away
D) unwanted pressure that will be alleviated by channel mediated facilitated diffusion
A
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Which of the following terms refers to a hardened and thickened area of skin resulting from persistent pressure and friction?
a) callus b) blister c) wart d) papule e) fever blister
Blood in the pulmonary veins returns to which chamber of the heart?
A. Left ventricle B. Coronary sinus C. Right ventricle D. Left atrium E. Right atrium
The lining of the alimentary canal is a ________
A) synovial membrane B) serosa C) mucosa (mucous membrane) D) cutaneous membrane
Ionic bonds involve ________, while covalent bonds involve ________.
A. weak attractions; the donation of electrons B. the transfer of electrons; the sharing of electrons C. the sharing of electrons; the donation of electrons D. swapping of electrons for protons; weak attractions