The tertiary structure of a protein is the _____
A) bonding together of several polypeptide chains by weak bonds
B) order in which amino acids are joined in a polypeptide chain
C) unique three-dimensional shape of the fully folded polypeptide
D) organization of a polypeptide chain into an ?-helix or ?-pleated sheet
E) overall protein structure resulting from the aggregation of two or more polypeptide subunits
Answer: C
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The sequence of the messenger RNA molecule (primary transcript) synthesized from a DNA molecule with a coding strand having the sequence 5' ATGCTACCGTTA is:
A. 5' UACGAUGGCAAU. B. 5' UAACGGUAGCAU. C. 5' AUGCUACCGUUA. D. 5' AUUGCCAUCGUA. E. None of the choices given is correct.
Megakaryocytes fragment to produce:
a. red blood cells b. lymphocytes c. platelets d. eosinophils e. neutrophils
Four of the five answers listed below are characteristics of the plasma membrane. Select the exception
a. phospholipid b. fluid mosaic c. lipid bilayer d. inert and impermeable e. hydrophobic tails
Which statement best describes why packed red blood cells are usually transfused instead of whole blood?
A) Whole blood contains antibodies that could attack the recipient's antigens on their red blood cells. B) Packed red blood cells are smaller than whole blood cells and therefore enter the bloodstream faster than whole blood. C) Whole blood contains plasma proteins that could cause edema in the patient. D) Packed red blood cells provide the red blood cells the recipient needs without adding plasma that may change their fluid volume too much. E) Whole blood is diluted with plasma so the recipient might not receive the needed number of red blood cells.