The accumulation of free oxygen in the atmosphere ____
a. was a result of the accumulation of a byproduct of a type of photosynthesis
b. caused the further spontaneous generation of life
c. provided the opportunity to extract more energy through anaerobic respiration
d. occurred immediately after the earth was formed
e. allowed for DNA to replace RNA as the primary data storage molecule
ANSWER: a
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A newborn who is accidentally given a drug that destroys the thymus would most likely _____
A) lack class I major histocompatability (MHC) molecules on cell surfaces B) lack innate immunity C) be unable to genetically rearrange antigen receptors D) be unable to differentiate and mature T cells E) have a reduced number of B cells and be unable to form antibodies
Four of the five roles listed below are functions of
parenchyma tissue. Select the exception. a. support b. heal wounds c. store food d. conduct photosynthesis e. regenerate lost parts
Photorespiration occurs most on:
A) hot, dry days. B) cold, dry days. C) cloudy, rainy days. D) hot, humid days. E) cool, cloudy days.
The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.
Answer the following statement true (T) or false (F)