The primary reason surplus carbohydrates in plants are stored as starch is because:
A. they would otherwise be utilized as energy
sources even if such energy was not needed
at that time.
B. the space they occupy as carbohydrates is
needed for other macromolecules.
C. energy is needed in the nucleus, and only
starch is capable of being transported into the
nucleus.
D. leaving them as individual
monosaccharides would upset the osmotic
balance of the cell.
D
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Which of the following is NOT a factor in
moving blood back to the heart?
a. systolic pressure b. smooth muscle contraction c. skeletal muscle contraction d. one-way valves in veins e. more than one of these is NOT a direct factor in moving blood back to the heart
From which generation does the pollen grain develop?
a. from the female gametophyte b. from the female sporophyte c. from the male sporophyte d. from the male gametophyte
Cells carry out three major types of work; which of the following involves nutrient uptake and waste elimination?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.
What type of bond contributes to a protein's secondary structure?
a. peptide bonds b. covalent bonds c. ionic bonds d. hydrogen bonds e. protein bonds