Nitrogen fixation by Frankia bacteria is efficient enough to allow alder trees to grow in the absence of combined nitrogen.
Answer the following statement true (T) or false (F)
True
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How can one identify oncogenes?
a) by introducing the DNA suspected of containing the oncogene into cultured cells and looking for altered growth properties b) by fusing two normal cells together c) by fusing two malignant cells together d) by introducing the DNA suspected of containing the oncogene into cultured cells and looking for altered nuclear membranes
Which of the following is an atomic particle that has no electrical charge?
A) electron B) neutron C) element D) proton E) isotope
The valence of an atom represents its
A) ability to interact with other atoms. B) electronegativity. C) radioactivity. D) ability to attract electrons. E) ability to interact with water.
What category of cells includes both phagocytes and lymphocytes?
A. Leukocytes B. Platelets C. Erythrocytes D. Target cells