At which one of the following days in the 28-day cycle is a woman MOST likely to get pregnant?
A) 1 (start of the menses)
B) 7
C) 14
D) 21
E) 28
C
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Which of the following products contain materials
obtained from tropical rain forests? a. tires b. ice cream c. shoes d. toothpaste e. all of these
The limnetic zone is indicated by
a. A. b. B. c. C. d. D. e. none of these
Atoms in which the number of electrons does not equal the number of protons are known as
A. valences. B. isotopes. C. ions. D. isomers.
Tay Sachs is a lysosomal storage disease that is inherited in an autosomal recessive manner (T= dominant allele; t = recessive allele). Individuals with Tay Sachs have a defect in the gene encoding hexosaminidase A, a lysosomal enzyme that breaks down cell membrane components called gangliosides. The inability to break down gangliosides causes harmful quantities of this lipid to accumulate in nerve cells of the brain, eventually leading to premature death of affected cells. There is no known cure for the disease, and death usually occurs by age 4. Jack and Jill have a child who has Tay-Sachs. What do you know about the genotypes of Jack and Jill?
A. Its impossible to tell. Since both are adults, they do not have the disease. But, they could either be TT or Tt B. Both are heterozygous C. Both are tt D. One is TT and the other is tt E. Both are TT