In an inherited form of high cholesterol, rr individuals have a blood cholesterol level greater than 500 mg/dL, Rr individuals are near 300 mg/dL, while normal (RR) cholesterol levels should be less than 200 mg/dL. The R allele is to the r allele.
A. codominant
B. recessive
C. homozygous
D. dominant
E. incompletely dominant
E. incompletely dominant
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Sulfuric acid is
A. involved in bioleaching. B. produced by unicellular sulfur-oxidizers. C. produced by Lactobacillus. D. a result of reduction of metal sulfides. E. involved in bioleaching AND produced by unicellular sulfur-oxidizers.
Suppose the lacI repressor gene were permanently silenced by an alteration to the DNA sequence
What would be the impact on the expression of the lac operon?
a. The lac operon would be transcribed but at a low level. b. The lac operon would be transcribed at a high level. c. There would be no real impact on lac operon expression. d. The lac operon would only be expressed when lactose was present. e. The lac operon would not be expressed even when lactose was present.
Which of the following primary succession
events led to the formation of the tundra?
a. large tsunamis b. glacial retreat c. volcanic activity d. the breaking up of Pangaea e. flooding caused by melting ice
Which of the following would not be seen in a cross-section through the woody part of a root?
a. sclerenchyma cells b. parenchyma cells c. sieve-tube elements d. root hairs e. vessel elements