Which of the following is (are) responsible for the
movement of nutrients upstream?
a. migratory fish and other animals
b. phytoplankton
c. bacteria
d. leaching
e. all of these
Answer: a
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Polypeptides can have which of the following types of effects?
I) autocrine II) paracrine III) endocrine A) only I and III B) only II and III C) only I and II D) I, II, and III
Axonemes grow out from a structure called a basal body located at the base of the cila or flagella. Based on this information where would you predict the plus end of the axonemal microtubules are located?
A. near the basal body B. near the tip of the axoneme C. at both ends of the axoneme D. It is not possible to predict from the information provided.
Which of the following is true of the mechanism of transcription attenuation of the trp operon?
A. The leader peptide mechanism is analogous to a repressor protein. B. The ribosome stalls at the adjacent Trp codons when the levels of tryptophan in the cell are high. C. The stalling of the ribosome at region 1 of the leader sequence inhibits the formation of the terminator structure. D. When sequences 2 and 3 of the leader sequence associate, transcription is terminated prematurely.
Interpretation of smell is accomplished
a. by the nasal epithelium. b. in the olfactory receptors. c. by centers in the brainstem. d. by the cerebral cortex. e. independently of olfactory receptors.