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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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?

Biology & Microbiology