In carbohydrates, the ratio of hydrogen (H) to oxygen (O) is ________.
A) 1:1
B) 2:1
C) 3:1
D) 4:1
Answer: B) 2:1
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An essential amino acid is best defined as one that:
A. cannot be synthesized by cellular biochemical pathways. B. is necessary for building proteins. C. cannot be obtained through the diet. D. functions as a vitamin. E. is required in large amounts.
One would think that deleterious genes would be eliminated by natural selection, yet we have two human genetic disorders with a high carrier frequency, sickle-cell anemia and cystic fibrosis. Why has this high frequency for these conditions remained in the population?
What will be an ideal response?
What is an action potential?
A. The potential that your body has to complete a movement
B. The collection of dendrites that make up a neuron
C. The movement of hormones in your body
D. The electric signal used by neurons to transfer information
The shift in the life cycle of land plants between haploid and diploid is known as
A. Alterations of generations B. Meiosis C. Mitosis D. Altering phases