Which of the following is false about chlamydias?
a. they are intracellular pathogens
b. they have a diminished or absent cell wall
c. their spiral shape allows them to drill into tissues
d. all of these are true
Ans: c. their spiral shape allows them to drill into tissues
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The two identifying characteristics of addiction are
A) intolerance and independence. B) intolerance and dependence. C) tolerance and independence. D) tolerance and dependence.
The natural philosophy of Aristotle and his colleagues was
a. mechanistic. b. vitalistic. c. a belief in absolute truth. d. a and c.
What type of DNA damage that involves disruption of single chemical bonds, sometimes causing base changes
a) Point lesion b) Main chain scission c) Atrophy d) Cross linking
It has been argued that cutting old-growth forests and replacing them with plantations of young trees would help to alleviate the threat of global greenhouse warming. What important fact does this argument ignore?
A) Forests play too minor a role in global CO2 dynamics, which are affected far more by marine algae. B) Young trees fix carbon at a lower rate per unit mass than old trees. C) Most of the biomass of the cut trees would be added to the atmosphere as CO2 within a few years. D) Most of the young trees would die within a few years.