Inside each leaf vein, ____ transports water and dissolved mineral ions to photosynthetic cells, while ____ transports products of photosynthesis (sugars) away from them
a. xylem; phloem
b. phloem; xylem
c. parenchyma cells; sclerenchyma cells
d. sclerenchyma cells; parenchyma cells
e. vessel elements; sieve elements
a
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Active transport occurs ________ the concentration gradient across a cell membrane.
A. against B. towards C. away from D. in between E. passively against
Molting in arthropods may involve a change in
all but a. body form and maturity. b. sex. c. body size. d. eating habits. e. sensory structures.
Which is incorrect about the Fc region of an immunoglobulin?
A. It contains an effector molecule that can bind to cells such as macrophages and mast cells. B. It is called the crystallizable fragment. C. It determines the class to which the immunoglobulin belongs. D. It contains an effector molecule that can fix complement. E. It forms the antigen binding sites.
An example of a neurotransmitter that works by activation of G proteins is:
a. acetylcholine. b. nitrous oxide. c. endorphins. d. GABA. e. serotonin.