The difference between prokaryotic and eukaryotic cells is that
A. all of these answers are correct
B. eukaryotic cells have organelles and most prokaryotic cells don't
C. eukaryotic cells are usually larger than prokaryotic cells
D. eukaryotic cells have nuclei and prokaryotic cells don't
Ans: A. all of these answers are correct
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Which of the following represents the activation energy required for a noncatalyzed reaction in the figure?
A) a B) b C) c D) d E) e
Fluorescence occurs when
a. a high-energy electron returns to its ground state by releasing energy in a photon. b. a low-energy electron moves to a high-energy state by absorbing heat. c. a high-energy electron leaves its nucleus and moves to a different molecule. d. a pigment molecule accepts a high energy electron and releases a photon of energy e. the energy from an electron is transferred to a different molecule while the electron returns to the ground state.
In humans, an increase of body temperature a few degrees above normal for a prolonged period
produces a state called
a. estivation. b. hyperthermia. c. thermal acclimatization. d. hypothermia. e. hibernation.
Rh incompatibility is due to an immune reaction in a pregnant woman to which of the following?
A. a self-antigen on red blood cells B. a foreign antibody on red blood cells C. a foreign antigen on red blood cells D. a self-antibody on red blood cells E. None of the answer choices is correct.