A group of organisms of the same species that live together in the same place make up a(n) ____
a. population
b. cell
c. biosphere
d. tissue
e. ecosystem
a
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Activation energy is the energy
A) required to transform all reactants into their reactive state. B) given off as the products in a chemical reaction are formed. C) absorbed as ?G0' moves from negative to positive. D) needed by an enzyme to catalyze a reaction without coenzymes.
Compared with sponges, cnidarians have a wider array of cell types permitting more sophisticated tissue functions. These functions include (select all that apply):
A. secretion of digestive enzymes. B. muscle contraction/movement. C. the ability to sense the environment via a network of nerve cells. D. the ability to communicate within the organism using hormones. E. none of these
The earliest photosynthetic autotrophs were probably:a
similar to the green and purple sulfur bacteria of today. b. first formed about 1 billion years ago. c. the first organisms to release oxygen. d. obligate aerobes. e. fermenting heterortrophs
A scientist conducts a procedure that causes nitrogen atoms to gain neutrons. The resulting atoms will be
A. new elements with higher atomic numbers. B. positively charged. C. ions of nitrogen. D. negatively charged. E. isotopes of nitrogen.