Bonds between which groups stabilize the structure of many proteins, including those that make up human hair?
A. Aldehyde
B. Sulfhydryl
C. Hydroxyl
D. Methyl
E. Carbonyl
Answer: B
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Regarding genome sequences and organismal development, it is important to remember that
A. development occurs almost exactly the same way in closely related species. B. development takes longer in some species than in others, and this time factor is important. C. gene sequence within a chromosome determines the timing of the gene expression. D. timing plays an important part in genome sequencing. E. changing the timing of gene expression can have dramatic changes in development.
The focus of ethology is on
A. genetic and physiological mechanisms of behavior. B. mammal behavior. C. bird behavior. D. the consequences of behavior. E. behavior in the field.
Which of the following would be examples of homologous structures?
1.The wing of a bee and the wing of a bird. 2.The leg of a grasshopper and the leg of a kangaroo. 3.The wing of a bird and the flipper of a whale. 4.All animal limbs are homologous.3
Membrane proteins serve many functions. One of the functions is transportation of substances across the membrane. If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins, the process that will be affected is
A. phagocytosis. B. simple diffusion. C. osmosis. D. pinocytosis. E. active transport.