The first cell that was seen under a microscope was a
a. blood cell.
b. skin cell.
c. cork cell.
d. sperm cell.
e. root tip cell.
Ans: c. Cork cell.
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Biotechnology advances are important in medicine. Which field is interested in determining how drugs used to treat disease may be affected by an individual's genetic makeup?
A) cloning B) genetic engineering C) gene therapy D) pharmacogenomics
The statistical study of populations including sex ratio, age structure, and predicting growth rates is called ________.
A. biometrics B. ethology C. demography D. population genetics
You observe a sunflower that moves its leaves so that it tracks the sun across the sky through the day,
and a sensitive plant that reversibly folds up its leaflets when you touch it. These are both examples of
a. phototropism. b. thigmotropism. c. stress responses. d. circadian rhythms. e. nastic movements.
In order to activate the cell mediated immune response, which event must occur?
a. A naïve helper T cell must bind to an antigen-presenting dendritic cell.
b. A naïve B cell must be activated in order to activate the effector helper T cell. c. A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell. d. A damaged or infected body cell must pass through a lymph node in order to activate T cells. e. Antibodies must bind to naïve helper T cells.