What is the role of the cap on a sperm's head?
a. It provides directional guidance for sperm in female reproductive tract.
b. It provides motility for sperm.
c. It provides energy for sperm.
d. It provides enzymes to digest outer jelly coat layer of oocyte.
e. It provides enzymes to digest sperm body to release nucleus.
d
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Which of the following is associated with dental caries?
A. Lactococcus lactis B. Enterococcus faecalis C. Streptococcus pneumoniae D. Streptococcus mutans
Which organelle contains powerful enzymes for digesting cellular waste?
a. Golgi body b. ribosome c. mitochondrion d. lysosome e. peroxisome
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial summation of inputs.
a. true b. false
An example of a pheromone in humans is
A. the mother's milk that transfers immunity to the infant. B. testosterone. C. a chemical released by males that reduces premenstrual tension in women. D. saliva exchanged during kissing (as a sexual stimulant).