Four of the five choices listed below are trends in
hominid evolution. Select the exception.
a. strong social bonding
b. enhanced vision
c. decrease in cranial capacity
d. omnivorous feeding behavior
e. increased manual dexterity
Answer: c
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What will be an ideal response?
Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes b. RNA can hold more information than DNA c. the first protists had RNA as their genetic material d. RNA's only role is that of an enzyme e. protocells contained DNA
Which of the following statements would NOT be considered a mechanism of action of hormones?
A. Adjacent cells coordinate cellular activities by exchanging ions and molecules across gap junctions. B. Increase or decrease the rate of synthesis of a particular enzyme or other protein by changing the rate of transcription or translation. C. Turn an existing enzyme or membrane channel "on" or "off" by changing its shape or structure. D. Stimulate the synthesis of an enzyme or a structural protein not already present in the cytoplasm by activating appropriate genes in the cell nucleus.
The movement of water and a dissolved substance from an area of high pressure to an area of low pressure is called:
A) filtration. B) active transport. C) facilitated diffusion. D) passive transport diffusion.