The reaction of ___________________ atoms in the body altered by magnetic fields and radio-frequency pulses are being measured via MRI.
Fill in the blank(s) with the appropriate word(s).
hydrogen
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The folds of the internal membrane of a mitochondrion are called
A. matrix. B. vesicles. C. vacuoles. D. cristae. E. cisternae.
Why does damaged cartilage heal slowly?
A) Chondrocytes cannot be replaced if killed, and other cell types must take their place. B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury. C) Damaged cartilage becomes calcified, thus blocking the movement of materials required for healing. D) Chondrocytes divide more slowly than other cell types, delaying the healing process. E) Damaged collagen cannot be quickly replaced, thus slowing the healing process.
Heme released from hemoglobin in aged red blood cells is decomposed in the liver into
A) iron and the bile pigment biliverdin, which is eventually converted to bilirubin. B) serum and plasma proteins. C) iron and interleukins. D) iron and the bile pigment bilirubin, which is eventually converted to biliverdin.
Match the term with its definition: Integral protein.
A)A protein that is not embedded in the lipid bilayer B)A protein with enzymatic activity C)A protein that is firmly inserted into the lipid bilayer D)A protein that is involved in cell-to-cell joining