The degeneration of nuclei is occurring in step(s)
a. 4.
b. 5.
c. 8.
d. 4 and 5.
e. 4 and 8.
E
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During human gestation, rudiments of all organs develop _____
A) in the first trimester B) in the second trimester C) in the third trimester D) while the embryo is in the oviduct E) during the blastocyst stage
Evolution can be best defined as ________.
A. change in the gene pool of a population B. always taking a very long time to occur C. change in the composition of populations D. the production of new species
Water molecules exhibit cohesive and adhesive properties. What is the chemical bond characteristic that contributes to these and other numerous important properties of water molecules?
A. The covalent bond strengths of water molecules change with pH, temperature, or solute conditions present. B. The covalent bonds that form water molecules transform to ionic bonds in presence of other molecules, temperature changes, or pH. C. Hydrogen bonds form between water molecules, not requiring gain, loss, or sharing of electrons. D. Bonds that form water are of the nonpolar covalent form. E. Ionic bonds between water molecules create increased surface tension.
Which of the following describes the role of myosin in muscle contraction?
A. ATP forms a bridge, binding actin to myosin. B. Actin heads bend when attached to myosin. C. Calcium ions form a bridge, moving actin along myosin. D. Myosin heads bend when attached to actin. E. Myosin synthesizes new strands of actin, lengthening the muscle.