You have a concentrated stock solution of 10 M NaOH and want to use it to produce a 150 mL solution of 3 M NaOH. What volume of water and stock solutions will you measure out to make this new solution?
(a) 135 mL of water, 15 mL of NaOH stock
(b) 115 mL of water, 35 mL of NaOH stock
(c) 100 mL of water, 50 mL of NaOH stock
(d) 105 mL of water, 45 mL of NaOH stock
(d)
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The feature of Darwin’s finches that shows variation
is a. feet. b. beaks. c. feathers. d. structure of eggs. e. all of these.
The ability of synaptic connections to change in response to experience is known as synaptic:a
transformity. b. plasticity.
c. conversion. d. modulation. e. potentiation
The nonporous, flexible central region of a tracheid wall pit in conifers is called
a. resin duct b. torus c. end wall d. sorus e. xylet
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