Most of the bacteria that cause human disease are ____
a. chemoautotrophs only
b. chemoheterotrophs
c. photoautotrophs
d. photoheterotrophs only
e. chemoautotrophs and photoheterotrophs
ANSWER: b
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Which type of communication mechanism travels the best in water?
a. Sound b. Smell c. Taste d. Sight e. All of these choices travel equally as well.
The relative impermeability of membranes to
water soluble molecules is a result of
a. the nonpolar nature of water. b. the presence of large proteins that extend through both sides of membranes. c. the presence of inorganic salt crystals scattered through some membranes. d. the presence of cellulose and waxes. e. the presence of phospholipids in the lipid bilayer.
A Barr body
A. is an inactive Y chromosome that produces reduced amount of gene products. B. exists within the cell in the form of heterochromatin. C. exists within the cell in the form of euchromatin. D. is an inactive X chromosome that does not produce gene products. E. Two of the above answers are correct.
During fossilization, remains of an organism may become suspended in fossilized plant sap, which is called ________.
Fill in the blank(s) with the appropriate word(s).