Damage to which structure causes cellular contents to leak into the surrounding medium?

A. cell wall
B. plasma membrane
C. nucleoid
D. glycocalyx


Ans: B. plasma membrane

Biology & Microbiology

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Because of the complexity of the Schistosoma life cycle, there are several parts of the cycle that could be disrupted to halt the spread of the disease.  Which of the following proposals is not likely to succeed in decreasing the prevalence of schistosomiasis?

A. Install sanitary sewage treatment facilities to prevent the dispersal of eggs present in urine and feces. B. Apply chemical molluscicides (chemicals targeted to molluscs like snails) to bodies of fresh water. C. Identify a surface protein on Schistosoma miracidia that the immune system can recognize and create a vaccine using that antigen. D. Monitor water bodies to detect the presence of infectious miracidia and enforce no bathing rules when they are present.

Biology & Microbiology

What are the small green appendages that might be found at the base of a leaf’s petiole called?

a. leaflets b. lamina c. stipules d. cuticles

Biology & Microbiology

If one were to propose a new taxon of plants that included all plants that are pollinated by animals, and only plants that are pollinated by animals, then this new taxon would be _____

A) monophyletic B) paraphyletic C) polyphyletic D) identical in composition to the phylum Anthophyta

Biology & Microbiology

The interrelationships between the endocrine and the nervous systems are especially apparent in a _____

A) steroid-producing cell in the adrenal cortex B) neurosecretory cell in the hypothalamus C) brain cell in the cerebral cortex D) cell in the pancreas that produces digestive enzymes

Biology & Microbiology