Which statement is NOT true about the cells of the nervous system?
A. A myelin sheath is a white insulating layer that covers many axons.
B. There may be multiple dendrites on a single neuron.
C. A neuron can have only one axon.
D. A dendrite is the part of the neuron that carries an electrical impulse away from the cell body.
E. A neuroglial cell supports or protects a neuron.
Answer: D
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As plants grow above ground, their water demands increase. One of the ways this demand is met is through the development of new root apical meristems. Why is it that root meristems can develop anywhere along the root?
A. Root meristems develop from the pericycle, a tissue present along the length of the root. B. Root meristems develop from the cortex, a tissue present along the length of the root. C. Root meristems develop only in regions where there is a high concentration of oxygen gas in the soil. D. Root meristems develop only in regions where there is a high concentration of nitrogen gas in the soil.
The following pertain to ribosomes during protein synthesis except
A. they use their large subunit to supply enzymes for peptide bonding. B. they participate only in translation. C. they bind to the 5' end of mRNA by their small subunit. D. they contain codons within their rRNA molecules. E. they shift towards the 3' direction along the mRNA strand from one codon to the next.
The nucleotide sequence of a gene is ____
a. made from amino acids b. found in the DNA backbone c. found on both sides of the DNA molecule d. the code for the sequence of amino acids for a polypeptide e. larger than a chromosome
The broad band of loose connective tissue beneath the mucosa that contains blood vessels, lymph, and nerves is called the
A. muscularis. B. submucosa. C. mucosa. D. serosa. E. diverticulosis.