Gnetophytes are different from other gymnosperms in that gnetophytes have vessel elements
____________________ Indicate whether the statement is true or false.
True
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Gram-negative bacteria are responsible for causing MOST foodborne diseases
Indicate whether the statement is true or false.
"Brush border" refers to ________ found on the surface of the epithelial cells of the small intestine
Fill in the blank(s) with correct word
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
Which of the following is an advantage of using chemical hormones as messengers rather than electrical signals to control body organs?
A. Different hormones can be targeted to different tissues because they are all chemically different. B. Chemical signals can spread to all tissues via the blood. C. Chemical signals are needed only in small amounts. D. Chemical signals can persist longer. E. All of the choices are correct.