In a study of Arabidopsis thaliana researchers determined that:
A. the levels of CO mRNA did not follow a
circadian pattern.
B. the levels of CO mRNA were high and in
sync with the light period when day-lengths
were long.
C. CO proteins accumulated only in the dark.
D. CO proteins are stabilized by dark periods
when day lengths are short.
E. photoreceptors show no indication of
stabilizing CO protein.
B
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During long-term potentiation the release of the neurotransmitter glutamate triggers the opening of sodium and calcium channels in the postsynaptic cell, increasing ion flow. What type of channel is responsible for this increase in ion flow?
A. voltage-gated ion channel B. ligand-gated ion channel C. ttretch-gated ion channel D. pump protein
An extra copy of chromosome 21, a condition called ________ syndrome, occurs in about 1 of every 700 births, although this rate varies tremendously with the age of the parents
Fill in the blank(s) with correct word
Antibodies and T-cell receptors are both produced by B cells
Indicate whether the statement is true or false
Which of these groups is NOT monophyletic?
a. Animalia b. Protista c. Plantae d. Fungi