Which is not one of the four atoms that make up the bulk of living organisms?
A) Oxygen
B) Nitrogen
C) Calcium
D) Carbon
C
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Without data from the base composition studies of Chargaff, what might Watson and Crickâs modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g. A with A, C with C). B. Any purine could pair with any purine. C. Any pyrimidine could pair with any pyrimidine. D. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine. E. Any purine could pair with any pyrimidine.
Which of the following statements about the placenta is false? a. The mother's body disposes of wastes for both mother and child
b. The placenta begins forming early in pregnancy. c. Maternal and fetal blood mix in the placenta. d. Embryonic blood vessels exchange substances with maternal blood.
Select the disorder that best matches each the following statements.
A. This disorder is an autosomal recessive disorder that results in the body's inability to break down lipids. B. This disorder is due to a sex chromosome abnormality probably caused by nondisjunction of sex chromosomes at meiosis. C. This disorder is an autosomal dominant disorder characterized by premature aging of body tissues. D. This disorder is an X-linked recessive trait. E. This disorder is also known as trisomy 21.
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