Which of the following contains enzymes capable of digesting an egg’s protective coverings to allow a sperm to fuse with the egg?
a. acrosomal vesicle
b. bulbourethral gland
c. seminal vesicle
d. prostate gland
a. acrosomal vesicle
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The primary function of centrioles in animal cells is ____
a. generation of flagella and cilia b. spindle formation c. to connect the two sister chromatids d. to provide a point of attachment for spindle fibers on chromosomes e. cell plate formation
The primary function of the endosperm is ____
a. protection b. reproduction c. growth d. nutrition e. water absorption
Which statement about chemical or electrical synapses is true?
a. Electrical synapses require a neurotransmitter. b. In electrical synapses, presynaptic and postsynaptic neurons are separated by synaptic clefts. c. Electrical synapses store excess ions in synaptic vesicles. d. In chemical synapses, presynaptic and postsynaptic neurons are connected by a protein channel. e. Electrical synapses involve the transfer of ions from presynaptic to postsynaptic neurons
The many individual light-sensitive subunits in an insect's eye are called
A) cones. B) corpuscles. C) ommatidia. D) rods. E) ganglion cells.