Of the following, which is the most current description of a gene?
A) a unit of heredity that causes formation of a phenotypic characteristic
B) a DNA subunit that codes for a single complete protein
C) a DNA sequence that is expressed to form a functional product: either RNA or polypeptide
D) a DNAâ€"RNA sequence combination that results in an enzymatic product
E) a discrete unit of hereditary information that consists of a sequence of amino acids
Answer: C
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In the extracellular matrix of animal cells, collagen and elastin fibers are embedded with this matrix.
A) glycoaminoglycans B) proteoglycans C) pectins D) lignins E) both choices A and B
A hydrogen atom that has become an ion is
a. a negatively charged ion. b. an isotope. c. unstable. d. a proton. e. an electron
The percentage of cancers associated with an inherited predisposition is approximately _________
A. 5 percent D. 50 percent B. 10 percent E. 75 percent C. 15 percent
What is the major developmental characteristic that shows the close relationship between echinoderms and chordates?
a. In both groups, the gut develops from front to back. b. In both groups, all individuals have notochords during the larval stage. c. In both groups, the gut develops from back to front. d. In both groups, development occurs by continually adding skeletal elements. e. Both groups have bilateral symmetry in all life stages.