The molecule that is polar and acts like a base is
A. R-OH
B. R-PO4
C. R-NH2
D. R-CO-R
E. R-SH
Answer: C
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Pemphigus vulgaris is an autoimmune disorder in humans in which antibodies are produced against the cadherins of desmosomes. The blistering of the skin and mucous membranes characteristic of this disorder is probably a result of _____
A) a decrease in flexibility of the cell membrane B) an inadequate number of G-protein receptors C) inadequate production of cytoskeletal proteins D) a loss in cell-cell adhesion
A common hypothesis and casual assumption is that dogs originated from wolves. Because of the wide range of body sizes and shapes, other hypotheses include dog ancestry of jackals, coyotes, dingoes, or other wild dog species. In recent years, several studies have been done to clear up the lineage. One study tested the Y chromosome DNA that can only be passed down from male to male, and the other other study tested the mitochondrial DNA because
A. the mitochondrial DNA records the inherited genetics of all the male and female parents of each generation. B. the mitochondrial DNA contains genes that could code for dog size. C. the mitochondrial DNA is only passed down through females to each new generation. D. the mitochondria perform cellular respiration, providing energy to speed up the DNA analysis. E. the mitochondrial DNA is much smaller, easier, and faster to analyze for the dog lineage.
A monosaccharide with 5 carbon atoms will have ________ hydrogen atoms and ________ oxygen atoms.
A. 5; 10 B. 10; 5 C. 10; 10 D. 5; 5 E. 2; 1
In eukaryotic cells, what name is given to the region that surrounds organelles but is not found inside the nucleus?
A) cytoplasm B) phospholipid bilayer C) nucleoid D) chloroplast