Secondary active transport
A) is not carried out by membrane proteins.
B) is not directly linked to the hydrolysis of ATP.
C) does not link the pumping of one substance to the concentration gradient of another.
D) does not require the cell to invest energy, either directly or indirectly.
E) cannot move a substance against its concentration gradient.
B
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Reduced hormone concentration in the blood often causes target cells to
A. up-regulate receptors in order to increase cell sensitivity. B. up-regulate receptors in order to decrease cell sensitivity. C. down-regulate receptors in order to increase cell sensitivity. D. down-regulate receptors in order to decrease cell sensitivity.
The layer of the epidermis that is constantly undergoing mitosis is called the:
a. dermal papillae b. stratum germinativum c. stratum corneum d. subcutaneous layer
Match the following plasma proteins with the correct function.
1. contribute(s) significantly to osmotic pressure of plasma 2. help(s) defend the body against germs 3. essential to the process of blood clotting 4. bind(s) with iron in the blood 5. a category that includes clotting factors and enzymes A. albumins B. globulins C. fibrinogen D. transferrin E. antibodies
Joints are also called
A) articulations. B) affectations. C) annotations. D) affiliations.