As few as ____ Escherichia coli O157:H7
cells can cause disease.
a. 11
b. 100
c. 10
d. hundreds
e. thousands
C
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How does today’s climate compare to most of the Earth’s history, and what does that information
indicate about how human activities can affect climate?
What will be an ideal response?Resource consumption tends to ____ with economic and industrial development
a. remain balanced b. decrease c. remain stable d. rise e. keep pace
When calcium levels rise, the __________ secrete(s)
__________, which __________ osteoclast activity. a. parathyroids; calcitonin; suppresses b. thyroid; calcitonin; suppresses c. thyroid; calcitonin; enhances d. thyroid; PTH; suppresses e. parathyroids; PTH; enhances
Over the course of evolution, humans have obtained four Hox gene clusters due to duplication. The presence of multiple Hox gene clusters suggests what?
A) Only one of the clusters is silent since it would result in Drosophila development not vertebrate. B) Only two of the clusters are active and represent the added complexity of vertebrate development. C) Three of the four clusters are silent and have no effect on development. D) All four clusters are active and represent the added complexity of vertebrate development.