Humans have how many pairs of chromosomes?
a. 15
b. 23
c. 46
d. 94
b. 23
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Humans have the least number of which class of teeth?
a. molars b. premolars c. canines d. incisors e. pre-canines
The gender of a human child is determined by the
a. loci. b. egg. c. autosomes. d. sperm.
Which of the following processes is NOT part of the communication at a neuromuscular junction? (Select all correct choices.)
A. The neuron releases a neurotransmitter to signal contraction by the muscle cell. B. A cell-surface receptor on the muscle cell is activated by acetylcholine binding. C. Upon activation, the acetylcholine receptor on the neuron undergoes a conformational change to activate an ion channel in the muscle cell. D. An opened ligand-gated ion channel allows sodium ions to rush across the plasma membrane to the inside of the muscle cell. E. A sudden influx of sodium ions across the plasma membrane drastically reduces the membrane potential and activates the contractile machinery of the muscle cell.
The amount of accumulated organic matter found in an area at a given time is the ________ crop biomass
Fill in the blank(s) with correct word