Which symptom is indicative of premenstrual syndrome?

a. drowsiness
b. headaches
c. water loss
d. fibroids


e. muscle soreness


ANSWER: b

Biology & Microbiology

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The stage of mitosis characterized by the physical separation of sister chromatids is called:  

A.  Anaphase B.  Metaphase C.  Prometaphase D.  Telophase

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Application of heat to living cells can result in all of the following EXCEPT

A) breaking of hydrogen bonds. B) alteration of membrane permeability. C) denaturation of enzymes. D) decreased thermal death time. E) damage to nucleic acids.

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Which of the following conditions would you use to enrich purple nonsulfur bacteria from lake sediments?

A) anoxic media with a good light source B) mineral media with ammonia and oxygen in the dark C) anoxic mineral media with an organic acid and a good light source D) mineral media with nitrate and acetate in the dark

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Which of the following molecules is a corepressor for the trp operon?

A. glucose B. cAMP C. tryptophan D. CAP E. lactose

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