In Drosophila, sex is determined by a balance between the number of haploid sets of autosomes and the number of ________

A) X chromosomes
B) telomeres
C) nucleolar organizers
D) Y chromosomes
E) centromeres


Answer: A

Biology & Microbiology

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________ not only stimulates the release of aldosterone from the adrenal glands but also causes constriction of small blood vessels (vasoconstriction)

Fill in the blank(s) with correct word

Biology & Microbiology

Root structures that grow around and encapsulate mutualistic nitrogen-fixing bacteria are called ____.

A. hyphae B. mycorrhizae C. Casparian strip D. root hairs E. root nodules

Biology & Microbiology

Which of the following antimicrobials does not match its potential shortcomings?

A) Macrolides: This narrow-spectrum drug must be administered parenterally. B) Phenicols: Has a narrow therapeutic index and is associated with bone marrow toxicity that results in aplastic anemia. C) Tetracyclines: Induce photosensitivity, causes detrimental effects on bones and teeth in children younger than 8 years old, and are associated with an increased risk of Clostridium difficile infection D) Aminoglycosides: Are known to cause irreversible hearing loss when administered other than topically. E) Lincosoamides: One common lincosoamide is associated with pseudomembranous colitis caused by Clostridium difficile.

Biology & Microbiology

Which statement does not describe helminthic parasites?

A) All tend to have complex life cycles that can involve different host species. B) All belong to one of two groups: roundworms or flatworms. C) An important mode of transmission is ingestion of the eggs or organism from feces-contaminated food and water. D) All are hermaphroditic. E) All reproduce sexually.

Biology & Microbiology