Why is light a source of energy?
a. It excites an electron within a pigment molecule, which then serves as a source of light energy that can be used for work.
b. It excites an electron within a pigment molecule, which then serves as a source of heat energy that can be used for work.
c. It excites an electron within a pigment molecule, which then serves as a source of potential energy that can be used for work.
d. It excites an electron within a pigment molecule, which then serves as a source of kinetic energy that can be used for work.
Answer: c. It excites an electron within a pigment molecule, which then serves as a source of potential energy that can be used for work.
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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.
In 2007, research confirmed the existence of hormones that control the timing of flowering. These hormones are called
A) abscisic acids. B) florigens. C) cytokinins. D) auxins. E) ethylenes.
The envelope of the HIV virus is actually part of the host cell plasma membrane.
Answer the following statement true (T) or false (F)
Staphylococcus epidermidis isolated from your nose or throat may be playing a protective role in your body.
A) True B) False