Which of the following statements about bone and its structure is NOT correct?
A. Bone tissue serves as a reservoir for calcium and phosphate ions.
B. Bone tissue is not living because it contains inorganic calcium phosphate crystals.
C. Bone contains an extracellular matrix of collagen fibers and inorganic calcium phosphate crystals.
D. Bone marrow is a reservoir for blood stem cells
E. Bone tissue is a special form of connective tissue.
Answer: B
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In the final reaction of the blood clotting cascade, before the formation of a network of fibers, the soluble plasma protein
A. fibrin is converted to the insoluble protein prothrombin. B. fibrinogen is converted to the insoluble protein fibrin. C. thrombin is converted to the insoluble protein fibrin. D. fibrinogen is converted to the insoluble protein thrombin. E. prothrombin is converted to the insoluble protein thrombin.
Which of the following is not needed in a reproductive cloning procedure?
A) an egg cell B) a sperm cell C) a surrogate mother D) a diploid cell
All of the following are essential amino acids except
a. alanine. b. lysine. c. methionine. d. threonine.
Which evolved first?
a. prokaryotes c. eukaryotes b. organelles d. mitochondria