In harvesting the chemical energy of the molecules in food:
a) organisms can utilize sugars, lipids, and proteins.
b) all macromolecules must first be converted into their hydrocarbon chains.
c) all macromolecules must first be converted into proteins or free-form amino acids.
d) all macromolecules must first be converted into glucose or another simple sugar.
e) all macromolecules must first be converted into glucose.
Ans: a) organisms can utilize sugars, lipids, and proteins.
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Most aquatic invertebrates that have a circulatory system use internal or external ____
a. tracheal tubes b. spiracles c. lungs d. gills e. body walls for direct diffusion
Why is it unlikely that we will find fossils of
every extinct species?
a. Most dead organisms are eaten by scavengers. b. Organic remains decompose. c. Not all species have hard parts like bones or teeth. d. Most fossils are buried too deep for us to find. e. More than one of these is correct
The embryo normally implants in the
A) oviduct. B) labia minora. C) ovary. D) endometrium.
Which of the following is NOT a drawback in using a microscope to count cells?
a. Debris in the sample may be mistaken for microbial cells. b. Motile cells must be immobilized before counting. c. Cells are difficult to stain. d. Without specific stains, dead cells cannot be distinguished from live cells.