In a resting neuron, which positively charged ions are more concentrated outside of the cell?
A. calcium
B. magnesium
C. sodium
D. potassium
Answer: C. sodium
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In order for competition to take place, what must be true?
1.There has to be two different species involved. 2.The resource must be limited. 3.The individual must have partitioned the resource. 4.The species must have a specialized niche.
What would be revealed in a comparison of mitosis and cytokinesis in animal cells and plant cells?
a. A cleavage furrow is initiated in animal cells, while a cell plate begins to form in plant cells during telophase. b. The nuclear envelope disintegrates in prophase in animal cells, but remains intact in plant cells. c. Sister chromatids are identical in animal cells, but they differ from one another in plants. d. In animal cells, chromosomes do not become attached to the spindle until anaphase, whereas chromosom
Which of the following types of cells does HIV preferentially infect?
A) cytotoxic T cells B) natural killer cells C) helper T cells D) memory cells
The _______________ is the study of what happens to all the alleles in a population
A. Macroevolution B. Microevolution C. Adaption D. Population genetics