What is the biggest threat to the species in the Klamath-Siskiyou forest of southwestern Oregon and northwestern California?
a. Logging of the forest
b. Degradation of the streams by pollution.
c. Periodic fires that sweep through, burning thousands of acres.
d. Development of the region for urban expansion.
e. None of these choices.
a
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Is a virus considered alive?
A. Yes, it possesses all of the requirements for life. B. Yes, it possesses enough of the requirements for life to be considered living. C. No, it does not possess any of the requirements for life. D. No, it does not possess all of the requirements for life.
The first event in photosynthesis is the:
a. movement of hydrogen ions through ATP synthases b. donation of electrons from a photosystem to an electron transfer chain c. fixation of carbon dioxide d. breakdown of the thylakoid membrane e. formation of phosphoglyceraldehyde
Immature B lymphocytes undergo clonal deletion in the bone marrow
Indicate whether the statement is true or false
Two cells with different cell-surface markers are fused in the presence of polyethylene glycol (PEG). The cells are then placed at 0°C. What do you expect to observe about the individual cell markers?
A) The markers will evenly disperse throughout both membranes. B) Only one marker will disperse, while the other remains stationary. C) Both sets of markers will not mix but will migrate to opposite poles from one another. D) The markers will essentially remain where they are, with little migration. E) The markers will be endocytosed by the fused cell and then redistributed as fused markers.