Muscles can only pull; they never push

a. true
b. false


Ans: a. true

Biology & Microbiology

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The plant alkaloid ricin is nontoxic inside castor beans, but becomes active when digested by an animal. The toxic form of ricin kills by  

A.  inactivating the animal's immune system. B.  over stimulating the animal's heart rate. C.  inactivating ribosomes needed for translation. D.  binding to RNA polymerase. E.  releasing cyanide.

Biology & Microbiology

Which is NOT a correct association?

Select one: a. adhesion junctions—skin b. adhesion junctions—bladder c. gap junctions—stomach d. tight junctions—intestines e. tight junctions—bladder

Biology & Microbiology

Which of the following definitions is

CORRECT?

a. A community refers to interaction between populations and their environment. b. A community refers to interaction between species and their environment. c. A community refers to the area in which different species live. d. A community refers to all species that live and interact in a specific area. e. None of these are correct

Biology & Microbiology

The portion of the DNA molecule that is translated is

composed of a. introns. b. anticodons. c. exons. d. transcriptons. e. exons and transcriptons.

Biology & Microbiology