A lichen is an example of a commensalistic relationship between a fungus and an alga
Indicate whether the statement is true or false
FALSE
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Bones at synovial joints are held in place by ____
a. tendons b. cartilaginous joints c. fibrous joints d. ligaments e. bone fragments
As electrons pass from photosystem II to photosystem I, they return to a lower energy level,
1.releasing free energy which is all lost as heat. 2.used to pump protons across the thylakoid membrane. 3.used to synthesize NADPH. 4.used to split water and release oxygen. 5.re-emitted as light.
How do large polar and charged molecules cross biological membranes?
A) Large polar and charged molecules can't cross biological membranes. B) Large polar and charged molecules cross biological membranes via diffusion through the hydrophilic core of the membrane. C) Large polar and charged molecules must be hydrolyzed before they can cross a biological membrane. D) Large polar and charged molecules cross biological membranes via transport proteins that form hydrophilic channels through the membrane. E) Both A and C
A scientific theory
A) is an educated guess. B) is a general explanation for natural phenomena. C) is less reliable than a hypothesis. D) will never be changed.