Animals need two types of organic precursors from their food, __________, to serve as the raw materials for the synthesis of larger organic molecules.
a. organic hydrogen and organic oxygen
b. organic carbon and organic nitrogen
c. organic carbon and organic hydrogen
d. organic carbon and organic oxygen
e. organic nitrogen and organic oxygen
Answer: b. organic carbon and organic nitrogen
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The information that determines what an organism will be like is stored in the ________ molecule.
Fill in the blank(s) with the appropriate word(s).
In the primary structure of a protein, amino acids are joined together by _______ bonds.
a. peptide b. phosphodiester c. glycosidic d. hydrophobic
Which of the following is not true in regard to crossover?
A. Spindle microtubules guide the transfer of DNA across the synaptonemal complex. B. Nonsister chromatids exchange genetic material. C. Chiasmata are formed. D. Recombination nodules mark the crossover point.
Which tree has needle-shaped leaves that are adaptations for minimizing water loss?
a. cacti b. conifer c. broadleaf evergreen d. deciduous angiosperms e. mesquite