Which of the following is the first step in the process of fertilization?
A. A sperm fuses with the egg's plasma membrane.
B. The sperm nucleus enters the egg, and the egg immediately prevents any further sperm from gaining access by forming a fertilization membrane that a sperm cannot penetrate.
C. The capacitated sperm release their acrosomal enzymes to penetrate through the cells surrounding the egg.
D. The nuclei of the sperm and egg rupture within the fertilized egg and the chromosomes mix to form a single nucleus.
Answer: C
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Of the two types of synapses, based on mode of communication, which is slower and more common?
A. Magnetic synapse B. Physical synapse C. Electrical synapse D. Mechanical synapse E. Chemical synapse
Reflexes that activate muscles on the same side of the body as the stimulus are called
A) contralateral. B) ipsilateral. C) monosynaptic. D) involuntary. E) polysynaptic.
A blastocyst is a hollow ball of cells, while the morula is a solid ball of cells
Indicate whether the statement is true or false
Striking the "funny" bone is actually stimulation (or injury) to the:
A) ulnar nerve. B) axillary nerve. C) radial nerve. D) median nerve.