In addition to supporting and protecting the body, the skeleton provides this function as well
A) Its muscles provide movement.
B) Its cartilages produce blood.
C) The bones store fat, red marrow, and calcium.
Answer: C
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The longest, heaviest bone in the body is the ________.
Fill in the blank(s) with the appropriate word(s).
During a cross-bridge cycle in skeletal muscle, the
a. cross bridge is energized as myosin ATPase activity hydrolyzes ATP. b. myosin cross bridge is able to bind with an actin molecule when Ca2+ pulls the troponin-tropomyosin complex aside. c. linkage between actin and the myosin cross bridge is broken at the end of the cross-bridge cycle as Mg2+ binds to the cross bridge. d. both (a) and (b) above. e. all of these answers.
A researcher identified an uncharacterized mouse gene and the protein it encoded. The researcher prepared antibodies to the purified protein. To determine the specificity of the antibody the researcher incubated tissue sections from a knock-out mouse with the new antibody. If the antibody were specific for the protein under study, would you expect to see labeling in these tissue sections?
a. Yes, because antibody binding does not involve gene products. b. Yes, because the protein is a mouse protein. c. Yes, because the gene was knocked out, not the protein. d. No, because the protein cannot be expressed if the gene is absent. e. No, because proteins are too small to visualize under a light microscope.
Which organ or structure is clearly visible in a 4-week-old embryo?
A) Fingers B) Eyes C) Ears D) Fingers, eyes, and ears are all clearly visible.