Certain plants may form tissues called ________ when their roots are flooded, whereas other plants may always form these tissue types.
A. aerenchyma
B. sclerenchyma
C. parenchyma
D. collenchyma
E. None of the answers is correct.
Answer: A
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Upon heat treatment, bacteria die at a constant proportion
Indicate whether this statement is true or false.
When a neuron is at rest,
a. there is a voltage difference across the membrane of about ?70 millivolts. b. the interior is positively charged. c. it is responding to a stimulus. d. the fluid outside the membrane has more sodium and less potassium than the cytoplasm. e. axons are firing at a faster rate.
Which of the following statements about uric acid is true?
A) Uric acid requires less water to excrete than does urea. B) Uric acid is more soluble in water than urea. C) The darker material in bird droppings is mostly uric acid. D) Uric acid is more toxic than ammonia.
These sharply pointed teeth on the sides of the mouth tear food
A) molars B) premolars C) canines D) incisors