RNA differs from DNA in that
A) it is usually single-stranded.
B) it is usually double-stranded.
C) it has thymine instead of uracil.
D) it has deoxyribose instead of ribose.
A) it is usually single-stranded.
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What form of bacterium is shown in this photomicrograph?
What will be an ideal response?
Biologically, which of the following is the least important characteristic of water?
A) Water molecules are polar. B) Water molecules form numerous hydrogen bonds. C) Water is a good solvent. D) Water typically contains isotopes of hydrogen. E) Water has a temperature-stabilizing capacity.
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). A cross of Bb Ss with bb ss would produce the phenotypic ratio a. 9:3:3:1. b. 1:1:1:1. c. 1:2:1. d. 3:1. e. 2:2.
Which of the following occurs after a calcium-rich meal?
A) Parathyroid hormone is released by the thyroid gland to inhibit the activities of osteoclasts. B) Calcitonin removes calcium from the blood and stimulates the activities of osteoclasts. C) Parathyroid hormone stimulates the activities of osteoblasts and removes calcium from the blood. D) Calcitonin stimulates the activities of osteoblasts and removes calcium from the blood.