The Lancefield grouping system ________.
A. is based on a DNA fingerprinting assay specific for streptococci
B. depends on serological detection of polysaccharide and teichoic acid antigens and is used to identify ? -hemolytic streptococci
C. is used to identify ?-hemolytic streptococci
D. depends on serological detection of polysaccharide and teichoic acid antigens
Answer: B
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A mature, unfertilized ovule in an angiosperm is the result of _____
A) a single meiotic division B) a single mitotic division C) both meiotic and mitotic divisions D) mitosis from the megaspore mother cell E) differentiation from the suspensor tissues
What was the major contribution of Gregor Mendel?
a. He coined the term genes. b. He provided evidence for how traits are inherited. c. He described how genes code for particular proteins. d. He explained the central role of proteins in the expression of traits.
How does x-ray crystallography provide details about molecular structure?
a. Only DNA molecules scatter x-rays; therefore, this helped to prove that DNA was the genetic material in cells. b. X-rays are reflected by some atoms and absorbed by others; thereby giving clues to molecule structure. c. X-rays are scattered by atoms in a specific pattern, from which molecular size, shape, and spacing of repeating elements can be calculated. d. This technique captures photographs of magnified molecules. e. X-rays can be used to isolate DNA molecules from living organisms.
What does fossil evidence allow scientists to determine?
What will be an ideal response?