Which of the following does not contain DNA in any cell type?
1.nucleus
2.cytoplasm
3.mitochondrion
4.none of the choices (all may contain DNA)
4
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Griffith found that a mouse injected with the green 'R' bacteria lived. When injected with the red 'S' bacteria died but if injected with dead 'S' bacteria, the mouse lived. In the image here, the mouse was injected with dead 'S' bacteria along with the live 'R' bacteria. The mouse then died.
Who followed up this experiment to determine what "transforming principle" caused the mice to die?
Select the TRUE statements about pulmonary surfactants? (Select all that apply.)
a. They are secreted by alveolar cells b. They lower the surface tension at the alveolar surface c. They reduce airway resistance d. They are made of lipids and proteins
An organism such as Mycobacterium tuberculosis would absorb which stain in its cell wall?
a. Crystal violet b. Methylene blue c. Carbolfuchsin d. Malachite green
The goals of conservation biologists include all of the following EXCEPT
A) studying the natural impacts of human activities. B) maintaining and restoring natural ecosystems. C) reversing the loss of biodiversity. D) cataloguing the number of species. E) working toward resource sustainability.