Most human adults are lactose intolerant. People with lactose intolerance produce insufficient amounts of _______.

A. vitamins
B. lactose
C. saliva
D. the enzyme lactase


D. the enzyme lactase

Biology & Microbiology

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The heavier components of oil evaporate fairly quickly

Indicate whether the statement is true or false

Biology & Microbiology

The recognition site for a restriction enzyme is 5? ACC^GGT 3?. The ^ symbol indicates the site of cleavage. After digestion of DNA with this restriction enzyme, how will the ends of the resulting DNA fragments look?

A) They will have sticky, single-stranded ends with 5? overhangs. B) They will have sticky, single-stranded ends with 3? overhangs. C) They will have blunt ends. D) They will have sticky, double-stranded ends. E) The result cannot be predicted using only this information.

Biology & Microbiology

When you swallow, the ____ covers the

entrance to the larynx. This structure is identified and labeled as letter ____ in the above diagram.

a. epiglottis; E b. pharynx; B c. glottis; C d. epiglottis; C e. trachea; E

Biology & Microbiology

Many male birds will expend a great deal of energy building nests. Females will mate with the males who build the

best nests. This is best described as an example of ____.

a. natural selection b. sexual selection c. runaway selection d. an invasive species e. disruptive selection

Biology & Microbiology