Antimicrobics effective against a wide variety of microbial types are termed
A) Narrow-spectrum drugs
B) Semisynthetic drugs
C) Broad-spectrum drugs
D) Synthetic drugs
E) Antibiotics
C) Broad-spectrum drugs
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Which of the following is not true of the antigen-independent period of lymphocyte development?
A. Lymphocytes with specificity for self are destroyed. B. Mature lymphocytes populate lymphatic organs and encounter antigens. C. Many lymphocytes with different specificities are formed. D. Random genetic rearrangements occur to produce different surface protein receptors. E. Lymphocytes form from stem cells in the bone marrow.
Robert Paine conducted studies of rocky intertidal communities on the coast of Washington and in the Gulf of California. Paine showed that removal of __________ consumers could result in reduction of the number of their resource species.
A) predator B) herbivore C) both predator and herbivore
Why does a typical fish die quickly when it is removed from water?
A) Oxygen diffuses more rapidly in water than it does in air. B) The gills collapse and dry out in the air. C) Water contains more oxygen, per unit volume, than does air. D) Gills split water molecules into hydrogen and oxygen, which is used for cellular respiration.
Which of the following stores the most energy in chemical bonds?
A. glucose B. sucrose C. galactose D. glycogen E. ribose