Certain human cell types, such as skeletal muscle cells, have several nuclei per cell. Based on your understanding of
mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis.
b. The cell undergoes repeated mitotic divisions with concomitant cytokinesis.
c. The cell undergoes repeated mitotic divisions but not cytokinesis.
d. The cell undergoes anaphase twice before entering telophase.
e. The cell goes through multiple S phases before entering mitosis.
ANSWER: c
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Which of the following has been found in
association with the K-T boundary layer?
a. iridium b. shocked quartz c. tektites d. all of these e. none of these
Biogeography is the study of
a. the distribution of land masses. b. the patterns in the geographical distribution of species. c. the patterns of species dispersal. d. the pattern of population demographics. e. none of these
The difference among cell types is not in the genes they possess, but in the genes they express, i.e., through epigenetics.
A. mutate, possess B. possess, express C. express, possess D. control, express
Different types of living matter often have different forms of the same elements in their bodies. For example, the nitrogen in an animal often has a slightly different atomic structure than the nitrogen in a plant
Recently, nutritionists have discovered how to deduce the diets of various animal species by examining the type of nitrogen (and other elements) inside their bodies. What is the chemical basis behind this scenario? A) Radioactive elements can be used to trace the paths of molecules through the body. B) Antioxidants buffer the potential damage that free radicals do to cells. C) Covalent bonds result when two atoms share electrons. D) Hydrophobic interactions keep water molecules from forming bonds with fats and oils. E) Isotopes of the same element have the same atomic number but different atomic masses.