Which type of signal only operates over very short distances?

a. chemical
b. tactile
c. electrical
d. visual
e. acoustical


ANSWER: b

Biology & Microbiology

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The pH scale is based on the hydrogen ion (H+) concentration of pure water, which has a pH of 7. What is the net difference in hydrogen ion (H+) concentration between pH 7 and pH 8?

a. 1 x 10-8 b. 10 x 10 c. 1 x 10 d. 1 x 8-10 moles

Biology & Microbiology

The early hominin fossils are found in

a. Africa. b. Asia. c. Australia. d. the South Pacific. e. Europe.

Biology & Microbiology

Which of the following is TRUE concerning the C4

pathway? a. It produces large amounts of carbohydrates. b. It feeds into the C3 pathway. c. It is the mechanism of photorespiration. d. It involves the activity of rubisco. e. All of these are true.

Biology & Microbiology

How many enzymes are involved in glycolysis of glucose to pyruvate?

A) 3 B) 6 C) 8 D) 10 E) 12

Biology & Microbiology