The _____ is the opening at the end of the glans of the penis through which urine and semen pass.
A. testis
B. fourchette
C. meatus
D. perineum
C. meatus
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Which of the following statements is false?
a. A heart will stop beating when the nerves to the heart are severed. b. Some cardiac muscle cells are self-excitatory. c. The pacemaker of the heart is the sinoatrial node. d. Cardiac muscle cells have numerous gap junctions on their sides to allow rapid communication. e. Cardiac muscle cells of the two ventricles contract essentially in unison.
The predatory bacterium Bdellovibrio bacteriophorus drills into a prey bacterium and, once inside, digests it. In an attack upon a Gram-negative bacterium that has a slimy cell covering,
what is the correct sequence of structures penetrated by B. bacteriophorus on its way to the prey's cytoplasm? 1. membrane composed mostly of lipopolysaccharide 2. membrane composed mostly of phospholipids 3. peptidoglycan 4. capsule A) 2, 4, 3, 1 B) 1, 3, 4, 2 C) 1, 4, 3, 2 D) 4, 1, 3, 2
The first autotrophs probably were _____ and produced _______.
A. photosynthetic, oxygen. B. photosynthetic, no oxygen. C. eukaryotic, oxygen. D. eukaryotic, no oxygen.
In the United States, how many embryos,
created by IVF, remain frozen?
a. 10,000 b. 50,000 c. 100,000 d. 500,000 e. 1,000,000