Which is false about estrogen receptors in humans?
a. They are restricted to females.
b. They are necessary for sperm maturation.
c. They bind the insecticides kepone and DDT,
now banned in the U.S.
d. Endocrine disruptors affecting them may be
responsible for declining sperm counts in
western countries.
e. All of these are false.
Answer: a
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Plant growth and flowering are strongly controlled by root and stem signal chemicals. Which of the following cell connection transports these molecules between adjacent cells?
A. tight junction B. plasmodesmata C. cell wall D. gap junction E. anchoring junction
In the general regression equation y = mx + b, variables m and b represent ________ and ________, respectively
A) the x-intercept, the y-intercept B) the regression line slope, the y-intercept C) the y-intercept, the regression line slope D) the y-intercept, the x-intercept E) narrow-sense heritability, broad-sense heritability
If dense bone lacked canaliculi:a
there would be no blood supply to the cells. b. diffusion between cells would not be possible. c. there would be no nerve supply to the tissue. d. the extracellular matrix would not be formed by osteoblasts. e. the osteoclasts would not be able to remodel the bone.
The species name is given to a group of bacteria with similar characteristics
Indicate whether the statement is true or false