The outer living limit of the cell is called the:
A) edge. B) plastid.
C) plasma membrane. D) cell wall.
Answer: C
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What is a key difference between autotrophs and heterotrophs?
a. Autotrophs harvest energy directly from the environment. b. Autotrophs do not require carbon. c. Autotrophs mainly break down organic compounds. d. Autotrophs harvest energy from decomposing organisms e. Autotrophs are consumers.
the illustration above to answer questions 16–19
E 16. Which structure is a dorsal,hollow nerve tube? a. A b. B c. C d. A and B e. none of these
Reduction involves the
A) loss of neutrons. B) gain of electrons. C) increase in oxidation state. D) gain of electrons and an increase in oxidation state. E) loss of neutrons, gain of electrons, and an increase in oxidation state.
Which of the following developed a set of postulates for determining whether a particular disease is caused by a particular pathogen?
A. John Snow B. Robert Koch C. Joseph Lister D. Louis Pasteur