Cells produced by dividing B or T cells may immediately begin to destroy an invader. These cells are
called
a. effector cells.
b. memory cells.
c. dendritic cells.
d. phagocytes.
e. fibroblasts.
A
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A somatic cell divides to form two genetically identical daughter cells during mitosis. Prior to mitosis, what must
occur?
a. The cell must replicate its DNA. b. The cell must first be fertilized. c. The nucleus must divide. d. Chromatids must be separated. e. The nuclear envelope must disintegrate.
Four of the five people below influenced Darwin's writing of the book On the Origin of Species by
Means of Natural Selection. Select the exception.
a. Mendel b. Wallace c. Lyell d. Malthus e. Lamarck
Which of the following apply to the demography of human populations today? (Check all that apply.)
A. We are using distributed resources disproportionately-less than 20% of us use over 80% of the energy. B. We have plenty of resources still untouched. C. We use over half of all renewable fresh water sources. D. We use almost half of the Earth's land. E. Our ecological footprint is decreasing.
In eukaryotes, which three factors appear to encourage the specific association of RNA polymerase(s) to a specific region of DNA?
What will be an ideal response?