Which of the following antibiotics is (are) produced by actinoplanetes?
A. Nalidixic acid
B. Gentamicin
C. Penicillin
D. Cycloserine
Answer: B
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All echinoderms (sea stars and sea urchins) have:
A. a cardiovascular circulatory system and bilateral symmetry. B. a water vascular system and five-fold symmetry. C. a cardiovascular circulatory system and five-fold symmetry.
Sxl protein mediates differential expression of genes further downstream in the developmental pathway
In females, active Sxl protein produced from Pm leads toproduction of proteins that facilitate female development—first Tra protein, which then, with Tra-2, facilitates splicing of the mRNA for active Dsx protein. In males: A. the absence of Sxl leads to a different splicing pattern of tra transcripts; a different version of Dsx isproduced that leads to male development. B. transcription from promoter Pe results in acharacteristic splicing pattern and the production of a burst of active Sxl protein. C. only stop codons are recognized, leading to splicing of Tra and overactivity of SxI. D. the start codons are preferentially removed in splicing, causing a premature termination of Dsx translation leading to male development.
An organism's response to the changes in the length of night compared to the length of the day is called ________
a. photoperiodism b. phytochromes c. gravitropism d. thigmotropism e. phototropism
Which of the following do NOT kill
microorganisms that get swallowed?
a. stomach acidity b. protein-digesting enzymes c. bile salts d. PAMPs e. all of these do kill microorganisms that get swallowed