All members of the penicillin family have
A. beta-lactam rings.
B. alpha-lactam rings.
C. phenolic rings.
D. sulfanilic rings.
A
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Select the best choice for statements 89–93 in reference to the
four groups of protists listed below. a. stramenopiles b. amoebozoans c. alveolates d. parabasalids and diplomonads E 89. The common amoeba, Amoeba proteus, is a member of this group. M 90. The slime molds are members of this group. M 91. The malarial parasite Plasmodium is a member of this group. D 92. This group includes the diatoms. M 93. Paramecium belongs to this group.
An organelle that is a flattened channel that begins at the nuclear envelope and snakes through the
cytoplasm is the a. Golgi body. b. ribosome. c. mitochondrion. d. lysosome. e. endoplasmic reticulum.
When the dorsal lip of the blastopore is removed from one developing embryo and successfully implanted into a different location in a second embryo of the same species at the same developmental stage, which of the following is the most likely result?
(A) Two neural tubes form in the second embryo. (B) Both embryos continue to develop normally. (C) The second embryo fails to develop a head. (D) The second embryo splits into two almost immediately.
The role of calcium in muscle contraction is to
A) release ADP and phosphate from myosin. B) make it possible for ATP to bind to actin. C) make it possible for myosin to bind to actin. D) make it possible for ATP to bind to myosin.