Which of the following statements regarding chemical reactions is false?
A. During a chemical reaction, atoms of one element can be converted into a different element.
B. There are chemical reactions close to you right now.
C. During a chemical reaction, molecules are rearranged.
D. The products of a chemical reaction always have the same mass as the reactants.
Answer: A
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Which of the following describes a feature of amino acid structure?
A. The central or ?-carbon of the amino acid is bonded to three other groups. B. Each amino acid will have either an ?-amino group or an ?-carboxyl group. C. The R groups of amino acids will vary in structure, size, electrical charge, and hydrophobicity. D. The ?-amino and ?-carboxyl groups are frequently modified by phosphorylation. E. In most cases, the central or ?-carbon of the amino acid is bonded directly to a hydroxyl group.
Contrast how turtles and crocodiles rid themselves of salts obtained through their diets
What will be an ideal response?
Ctenophores capture food by:
A. sticky mucus on their tentacles that capture small invertebrates. B. adhesive glue cells that trap prey. C. stinging hair cells that immobilize small invertebrates. D. digging through the bottom mud for small invertebrates. E. filter feeding
Roberts Syndrome is an extremely rare genetic disorder that is characterized by mild to severe prenatal retardation or disruption of cell division, leading to malformation of the bones in the skull, face, arms, and legs. Shown below is a pedigree for a family with Roberts Syndrome. Consider couple II-C and II-D. What is the probability that their next two children will have Roberts Syndrome?
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A. 1/16 B. 1/32 C. 1/2 D. 1/4 E. 1/8