Molecules such as H?H and O=O are held together by ____
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
E
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In the process of in vitro fertilization, after a cell has been removed from an embryo for preimplantation genetic diagnosis, the embryo
A. will continue to produce new cells through meiosis. B. will then be placed in a cloning chamber. C. cannot develop into a fetus or baby. D. will continue to grow and develop. E. will be used for gene therapy on parents or siblings.
____ is the study of body plans and structures
a. Evolution b. Biogeography c. Comparative morphology d. Comparative physiology e. Natural history
Individuals who are __________ for sickle cell hemoglobin tend to be __________ resistant to
falciparum malaria, but do not experience the effects of sickled red blood cells. a. homozygous dominant; more b. homozygous dominant; less c. homozygous recessive; less d. heterozygous; more e. heterozygous; less
Which phase(s) of meiosis occur in a similar manner to mitosis?
A. Prophase I and Prophase II B. Prophase I, Metaphase I, Anaphase I. C. Prophase II, Metaphase II, Anaphase II, Telophase II D. Prophase I, Metaphase, I, Prophase II, Metaphase II E. Prophase I, Anaphase I