The duck-billed platypus shares which trait with non-mammalian animals?
a. teeth
b. lack of cloaca
c. laying eggs
d. hair
e. females produce milk
ANSWER: c
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The outside of a neuron is positively charged at resting potential. Why don't negative ions exit from the cell to normalize charge across the membrane?
A. The positive charge outside the cell repels negative ions. B. There are no negative ions inside the cell. C. All of the chloride ions are already outside the cell. D. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane.
A plant cell exhibits defects in transcription of transfer RNA genes. The gene encoding which polymerase is likely to be mutated in this cell?
What will be an ideal response?
If reproduction was not limited, how many descendants could a single pair of elephants have after 750 years, according to Darwin's calculations?
a. 15 000 b. 150 000 c. 19 million d. 190 million
Which structure prevents blood flowing back into the heart from the aorta between heartbeats?
A. ductus arteriosus B. atrioventricular valve C. mitral valve D. tricuspid valve E. semilunar valve