Carbon and hydrogen make up many biologically important molecules. Carbon has an electronegativity of 2.55, whereas hydrogen has an electronegativity of 2.2. Based on the electronegativity difference between the atoms, the carbon and hydrogens shown here have just formed
A. an ionic bond.
B. a hydrogen bond.
C. a polar covalent bond.
D. a nonpolar covalent bond.
E. an element.
D. a nonpolar covalent bond.
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A phylogenetic species comprises ____
a. populations that share a recent evolutionary history b. individuals that share a recent evolutionary history c. interbreeding populations that are reproductively isolated d. individuals that share measurable traits that distinguish them e. one large gene pool subdivided into local populations
Contact inhibition is an important mechanism for maintaining cell growth in developed organs and
tissues. As long as the cells remain in contact with each other they remain in ____ and are prevented from dividing.
a. prophase b. G1 c. G2 d. G0 e. S
Plasma
A. is the liquid portion of blood in which blood cells are suspended. B. contains albumin and globulins. C. contains fibrinogen. D. is mostly water. E. All of the choices are correct.
Amino acids are metabolized by reactions in which the amino group (2nh2) is first removed ___________
Fill in the blank(s) with the appropriate word(s).