Because of the mechanism of sex determination, males of many species can be neither homozygous nor heterozygous. Such males are said to be ________
A) dominant
B) complementary
C) hemizygous
D) recessive
E) None of the answers listed is correct.
C
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Where does the bond form that binds one strand of DNA to its other strand?
A) Between the sugar and the base B) Between the phosphate group and the sugar C) Between the bases D) Between the phosphate groups
H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together
He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions), and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
Which factor has dramatically decreased infant mortality in human populations?
A) a shift from an agricultural to an industrial economy B) the use of pesticides to reduce mosquito populations C) the choice made by educated women to have fewer children D) an increase in poverty in developed countries
The number of proteins in humans
A) is approximately equal to the number of genes. B) is less than half the number of genes. C) is much greater than the number of genes.