A friend asks you for a definition of endemic because she is writing a history paper and this word keeps occurring in the literature in reference to bison on the Great Plains of the United States. Your response is that the word endemic means
A. a species that has gone extinct since humans have evolved on Earth.
B. a species that exists in many habitats on Earth.
C. a species that has coevolved with humans on Earth.
D. a species that lives in only one area of Earth.
D. a species that lives in only one area of Earth.
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Which gland secretes sex hormones?
a. testis b. adrenal medulla c. thyroid d. kidney e. pancreas
Which of the following statements regarding the development of AIDS following infection with HIV is incorrect?
A. Antibodies to HIV antigens formed in response to HIV infection appear within a few weeks of infection and remain high through latency and AIDS. B. CD4 T cells are present in low numbers in an uninfected individual, but become elevated upon HIV infection, and ultimately fall to very low numbers (<200 cells/ml) as the infection progresses to AIDS. C. An HIV-positive individual in the latency phase can be distinguished from an uninfected individual by the presence of antibodies to HIV antigens in their blood. D. Viral antigens can be detected at high levels in the blood within days following infection, then their numbers fall dramatically during a latent period and rise again when AIDS symptoms occur.
What structures are found within prokaryotic cells?
What will be an ideal response?
The lowest temperature that kills all cells in a broth in 10 minutes is known as the (microbial/terminal/thermal) death point
What will be an ideal response?