The discovery that the intermediate filament protein keratin is essential for mechanical strength of epithelial cell layers was made in

a. cell cultures.
b. organ cultures.
c. small invertebrates.
d. transgenic mice.


Ans: d. transgenic mice.

Biology & Microbiology

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At a celebratory dinner for a recent publication, a marine biologist ordered the lobster claw appetizer. What part did she order? 

A. Nauplius B. Telson C. Uropods D. Cheliped

Biology & Microbiology

A taxon that diverges earlier than the other taxa being considered in cladistic analysis is:

a. a homologous taxon. b. an outgroup. c. a derived taxon. d. an Amphioxus. e. a clade

Biology & Microbiology

The term for a cross that involves just one trait, such as pod shape, is called a

a.) homozygous cross. B.) test cross. C.) monohybrid cross. D.) dihybrid cross.

Biology & Microbiology

During open-heart surgery, the first heart structure that would be cut into is the ________.

A. pericardium B. right ventricle C. left atrium D. left ventricle E. myocardium

Biology & Microbiology