As humans move into an area, the habitat often becomes fragmented due to clearing of land to
build homes and roads, while leaving small areas of natural habitat. For small species that
cannot navigate long distances from one habitat fragment to the next, speciation will likely
occur due to __________ barriers.
a. geographical
b. temporal
c. behavioral
d. geographical and temporal
A
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Lymphogranuloma venereum is a sexually transmitted disease caused by distinct strains of ________
A) Chlamydia trachomatis B) herpes simplex 2 virus (HSV-2) C) Neisseria gonorrhoeae D) Haemophilus ducreyi
Which part of a cholesterol molecule is polar?
A. The OH group B. The four interconnected planar rings C. The hydrocarbon tail D. Both the four interconnected planar rings and the hydrocarbon tail
The lac operon
A. is an example of negative control. B. is affected by catabolite repression. C. produces lactose. D. is an example of a regulon. E. is an example of negative control AND is affected by catabolite repression.
The glycerol head of a phospholipid can be described as _________, while the fatty acid tails can be described as ________.
a. hydrophobic; hydrophobic b. hydrophilic; hydrophobic c. hydrophilic; hydrophilic d. hydrophobic; hydrophilic