After the activation of a G-protein, the sequence of signaling events consists of:
Answer: Effector enzyme, second messenger, protein kinase, substrate protein
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The target cells of glucagon are
a. the liver cells. b. the skeletal muscle cells. c. the fat cells. d. all of these cells. e. none of these cells
Which one of the following structures is characteristic of BOTH eukaryotic and prokaryotic cells?
A) nucleus B) mitochondria C) endoplasmic reticulum D) cell membrane E) Golgi apparatus
Yellow-seeded pea plants may be homozygous or heterozygous. To find out which, cross the plants with
A) true-breeding green-seeded plants. B) heterozygous green-seeded plants. C) the same genotype. D) true-breeding yellow-seeded plants. E) heterozygous yellow-seeded plants.
Which of the following is an example of artificial selection?
a. scientists have bred strains of the house mouse that are missing certain alleles. These strains were produced in the laboratory to allow scientists to study diseases that occur in humans. b. The ancestor of broccoli was weedy looking plant that looks very different than broccoli. Farmers selected plants with large stems and flowers and used their seeds to produce the next generation. Over time this became what we now call broccoli. c. Long ago people started to keep wild cats and bred the most docile ones. After many generations of doing this and selecting for traits that people liked, we now have domestic house cats. d. all of these