In Arabidopsis the gene TRIPTYCHON is involved in determining ____
a. how closely trichomes will develop to each other
b. whether or not trichomes are formed
c. which side of a leaf will have trichomes
d. the number of branches of a trichome
e. cell division within trichomes
ANSWER: d
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A housekeeping gene is one that codes for a product that:
A. functions in removing dirt from the cell. B. is expressed differentially based on the needs of the cell. C. is expressed at a constitutive level. D. functions exclusively in cell membrane maintenance.
Which of the following is not an advantage of extracellular digestion?
A. The interior of cells is protected from hydrolytic enzymes. B. Very large portions of food can be consumed at once and digested over a long period of hours to weeks. C. Specialized regions of the cavity can segregate digested food from nondigested food. D. Digestion can be regulated by hormones. E. Vacuoles allow for direct phagocytosis by individual cells.
Exotic species that are introduced into a non-native
habitat can a. interbreed with native species. b. drive endemic species to extinction. c. die out due to competition from native species. d. blend in with endemic species. e. create habitat islands for themselves.
What is creatinine?
a. A substance made of phosphate b. A substance that can lead to uremia c. A waste product of muscle metabolism d. A chemical that can precipitate from the blood and build up in the joints