Organisms capable of nitrogen fixation
(a) include some bacteria.
(b) include some cyanobacteria.
(c) may live as symbionts with other organisms.
(d) all of the above.
(d) all of the above.
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The organelle involved in the oxygen-requiring process by which the energy harvested from macromolecules is used to generate ATP is the:
A. chloroplasts. B. ER. C. nucleus. D. lysosome. E. mitochondria.
The allantois
A) destroys old blood cells. B) gives rise to the yolk sac. C) forms blood cells. D) is part of the placenta.
When a neuron is at rest
a. there are more positively charged ions inside the axon than outside it. b. there are more negatively charged ions inside the axon than outside it. c. there are more negatively charged ions outside the axon than inside it. d. there are equal amounts of negatively charged ions outside the axon and inside it. e. there are more positively charged ions outside the axon than inside it.
How many coiled and fluid-filled ducts are found in
each cochlea? a. 1 b. 2 c. 3 d. 4 e. 5 or more