People with giant axons lose the ability to move and see because
A) apoptosis in their body rapidly and neatly dismantles cells into membrane-enclosed pieces that a phagocyte can mop up.
B) they lack a protein, called gigaxonin, which normally breaks down intermediate filaments and recycles their components.
C) they have an excess of CFTR proteins, which entrap salt inside cells.
D) their hemoglobin leaks out of the cells of the body.
B) they lack a protein, called gigaxonin, which normally breaks down intermediate filaments and recycles their components.
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Which of the following are the major groups of vascular plants?
A. liverworts, ferns/horsetails, gymnosperms, and angiosperms B. liverworts, hornworts, mosses, and lycophytes C. lycophytes, ferns/horsetails, mosses, and gymnosperms D. angiosperms, lycophytes, gymnosperms, and ferns/horsetails E. mosses, liverworts, ferns/horsetails, and lycophytes
At the arteriole end of the capillary, precapillary sphincters
a. force blood back into arteries. b. control blood flow into capillaries. c. control blood flow into venules. d. connect arterioles to venules. e. force blood back into veins.
In an autosomal dominant disorder such as Huntington's, two heterozygous parents have the
probability of passing the gene on to ____ percent of their children. a. 50 b. 0 c. 100 d. 25 e. 75
An adolescent female who is hyperactive, nervous, irritable and has eyes that are protruding from their sockets is most likely suffering from ________, which is caused by ________.
A. Graves disease; oversecretion of T3 or T4 due to antibodies that mimic the effect of TSH B. Cushings disease; oversecretion of T3 or T4 due to antibodies that mimic the effect of parathyroid hormone C. Cushings disease; oversecretion of T3 or T4 due to antibodies that mimic the effect of TSH D. Graves disease; oversecretion of T3 or T4 due to antibodies that mimic the effect of calcitonin E. Graves disease; undersecretion of T3 or T4 due to antibodies that mimic the effect of TSH