The dark gray dots along the trunk of this evolutionary tree represent both common ancestors and
a) hybridization events
b) speciation events
c) branches
d) convergent traits
e) analogous traits
Ans: b) speciation events
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Each strand of the DNA molecule serves what function during DNA replication?
a. source of amino acids b. source of bases c. enzymatic function d. DNA unwinding e. DNA template
A species that consumes only animal tissue is called a(n) ________
Fill in the blank(s) with correct word
All of the following statements are true about mutations EXCEPT:
a) Most mutations are harmful or neutral to the organism in which they occur. b) A mutation is any change in an organism's DNA. c) The origin of genetic variation is mutation. d) Mutations are almost always random with respect to the needs of the organism. e) The mutation rate can be affected by the bottleneck effect.
The majority of foodborne infections in the United States are NOT caused by a bacterial pathogen but instead are caused by ________, which is nicknamed “the 24-hour bug.”
a. astrovirus b. henipavirus c. norovirus d. rotavirus