Which pigment is always present when a dominant allele (A) is present?
a. Red
b. Yellow
a
You might also like to view...
The preassembled carbohydrate tree is added on_____ residue
Fill in the blank(s) with the appropriate word(s).
Which of the following represent antiphagocytic strategies used by some pathogens?
a. avoiding destruction inside phagocyte b. Secretion of hyaluronidase c. secretion of leukocidins d. secretion of capsule/slime layer e. attachment with fimbriae
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate
They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A) There is no radioactive isotope of nitrogen. B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C) Although there are more nitrogens in a nucleotide, labeled phosphates actually have sixteen extra neutrons; therefore, they are more radioactive. D) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
Calcitonin is produced by the
A. thyroid gland. B. adrenal medulla. C. anterior pituitary. D. parathyroid glands.