About 10-15% of African Americans in the US are carriers for ____, an autosomal recessive genetic disorder in which
a defective version of the hemoglobin protein is produced.
a. Duchenne muscular dystrophy
b. phenylketonuria
c. achondroplasia
d. sickle-cell anemia
e. cystic fibrosis
ANSWER: d
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Long-day plants typically flower in which season?
a. fall b. spring c. summer d. winter
Select the false statement:a
Biomass reduction from one trophic level to the next is approximately 50 %. b. Biomass reduction from one trophic level to the next varies widely in nature. c. Biomass reduction can be measured as dry weight. d. Biomass may be measured as live weight. e. Biomass in an ecosystem can be illustrated using a pyramidal-shaped graph.
Choose the description below that best matches the current model of RNA polymerase holoenzyme.
A. A core enzyme composed of five polypeptides bound by ribosomes. B. A core enzyme composed of five polypeptides bound by a transcription factor. C. A core enzyme composed of five sigma factors bound by a polypeptide chain. D. An open complex or "bubble" formed by DNA, mRNA, and RNA polymerase.
The actual exchange of gasses occurs at the site of the
a. trachea b. nasal passageway c. larynx d. alveoli