The gene pool for a particular population is made up of
A) all the genes that occur in the population.
B) all the alleles for a certain trait in a given individual.
C) all the genes for a certain trait that occur in the population.
D) the sum of all the homozygous individuals in the population.
E) the sum of all the heterozygous individuals in the population.
A
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Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. lysing virus-infected cells and preventing further propagation of the pathogen. B. stimulating components of the immune system through the release of cytokines. C. blocking or reducing the inflammation response in mucous membranes. D. stimulating the production of specific antibodies. E. recruiting macrophages to the nasal epithelium.
Where are introns removed from pre-mRNA in eukaryotes?
a. ribosomes b. the cytoplasm c. the nucleus d. lysosomes
Polar bears are top predators, and tests on their
tissues have shown a surprising a. resistance to warming. b. amount of protein. c. resistance to disease. d. amount of mercury and organic pesticides e. evidence of none of these.
An oncologist (a physician who specializes in cancer) compares two biopsy samples by looking at the percentage of cells in mitosis. Sample 1 has 15% of cells in mitosis, and sample 2 has 8% of cells in mitosis
These samples are of the same tissue type. Which sample is likely to be cancerous, and why? Why is it important that the two samples being compared came from the same tissue type?