RNA and proteins combine in cells to form structures called ribosomes. Ribosomes contain the active site for peptide bond formation. Based on their chemical structures, do you think protein or RNA molecules actually form the active site within the ribosom
A) protein, because RNA cannot catalyze reactions
B) RNA, because proteins cannot catalyze a reaction that involves another protein
C) proteins, because only proteins can catalyze a reaction that involves another protein
D) It could be either, because both molecules have catalytic properties.
Answer: D
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Of the following combination of statements about protostomes and deuterostomes, which choice is correct?
A. Protostomes are animals in which the mouth develops from the blastopore, and the anus or anal pore develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development. B. Protostomes are animals in which the anus develops from the blastopore, and the mouth develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development. C. Protostomes are animals in which the mouth develops from the blastopore, and the anus or anal pore develops from the second opening. Deuterostomes are animals in which the mouth develops from the blastopore and the anus develops secondarily later in their development. D. Protostomes are animals in which the mouth or anus develops from the blastopore, depending on the species. Deuterostomes are animals in which the mouth and anus develops from the blastopore, depending on the species.
An endemic fungal infection that is found in the semi-arid to dry soils in the southwestern United States and Mexico is
A) aspergillosis. B) histoplasmosis. C) murcomycosis. D) coccidioidomycosis. E) blastomycosis.
Which of the following is NOT a characteristic of all living things?
A. metabolism B. motility C. growth D. reproduction E. responsiveness
Kettle ponds derive from a hole left by a retreating glacier that is subsequently filled with rainwater. A certain region has a series of disconnected kettle ponds, but occasionally heavy rains flood them and create streams. Which type of animal is most likely to be present in this area as a metapopulation?
A. A dragonfly B. A mosquito C. A fish D. An aquatic bird