All of the following are part of a prokaryotic cell EXCEPT _____
A) DNA
B) a cell wall
C) a plasma membrane
D) ribosomes
E) an endoplasmic reticulum
Answer: E
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Which of the treatments listed below would be MOST effective for a patient with a genetic defect that causes severe combined immunodeficiency (SCID)?
A) intravenous antibiotics B) bone marrow transplant C) multiple immunizations D) repeated doses of antisera
Bread making requires yeast, flour and water. Why is yeast used?
A. It makes the bread healthier as yeast is a source of vitamins. B. It makes the bread rise due to the carbon dioxide released during ethanol fermentation. C. It makes the bread rise due to the carbon dioxide released during cellular respiration. D. It makes the bread sour due to lactic acid fermentation. E. It makes the bread crunchy.
Members of the phyla Ectoprocta, Brachiopoda, and Phoronida all possess a lophophore, which isa(n) ____
a. cluster of pores along the aboral surface, used for expelling wastes from the digestive tract b. hard shell made of calcium carbonate c. outpocket of the digestive tract, where metabolic wastes are processed before emptying into the digestive tract for expulsion d. circular fold with one or two rows of hollow, ciliated tentacles e. extra body cavity surrounding the digestive tract filled with muscles used for locomotion
Scientists depend on systematic observations to develop systems to classify organisms. The classification system most commonly used by scientists consists of different categories arranged in a hierarchy. Which level represents the most exclusive category or group?
A) species B) order C) phylum D) class