Light consists of units of energy called
A. electrons.
B. photons.
C. calories.
D. neutrons.
E. pigments.
B. photons.
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____ may have been the ancestors of cellular life
a. Circular RNA b. Prokaryotic cells c. Pseudocells d. Lipid globules e. Protocells
Which of the following controls the temperature in endothermic animals?
A) Reflexive skeletal muscles B) Autonomic nervous system C) Cerebral cortex D) Positive feedback systems E) Hypothalamus
These two secondary lesions arise when bleeding or burst capillaries occur in the skin
A) crust and scale B) papular and maculopapular rashes C) petechiae and purpura D) bullae and vesicles E) cysts and ulcers
Which one of the following molecules is able to move across the cell membrane by simple diffusion?
A. DNA B. hemoglobin C. carbon dioxide D. starch E. glucose