Which of the following pertains to an improperly canned food product on a store shelf that bulges from microbial activity?
A) thermophilic anaerobic spoilage
B) hydrogen sulfide spoilage
C) mesophilic spoilage
D) bacterial soft rot
E) flat sour spoilage
Ans: C) mesophilic spoilage
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During differentiation, organs develop with different numbers of cells due to ____
a. cell adhesion molecules that are only present in some tissues b. cell migration c. cell determination d. the variable length of mitotic interphase e. microtubule rearrangement
Gastrulation in human embryos occurs about
___ after fertilization.
a. 5 days b. 2 weeks c. 4 weeks d. 2 months e. 5 months
In the accompanying figure, the formation of eggs would occur in the structure labeled as ____
a. 1
b. 5
c. 6
d. 9
e. 10
Which of the following methods is best for counting fecal bacteria from a stream to determine the safety of the water for drinking?
a. dry weight b. turbidity c. viable plate count d. membrane filtration