Endotoxins are heat-stable lipopolysaccharide (LPS) component of the outer membranes of Gram-negative bacteria. These endotoxins are highly antigenic and can be inactivated to form toxoids and used as vaccines.
a. true
b. false
Ans: b. false
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By some estimates, how many species are undergoing premature extinction because of human actions?
a. 6 per day
b. 10 per day c. 1 per hour d. 6 per hour e. 10 per hour
Which element is a micronutrient in plants?
a. chlorine b. hydrogen c. potassium d. calcium e. magnesium
I tend to have an inquiring mind, and I want to know more about how water moves within the plant body. I take a common houseplant and cut the stem off about 1 inch from the soil surface. I notice water collecting at the cut as if some force is pushing it up through the roots and remaining stem. How could I best explain my findings?
What happens when hydrochloric acid (HCl) dissociates in pure water?
A) The water has a decrease of H+ ions. B) The concentration of OH- ions increases. C) The HCl molecules float on top of the water. D) The pH of the solution increases. E) The HCl molecules separate into H+ and Cl- ions.