Growth factors are local regulators that _____
A) are modified fatty acids that stimulate bone and cartilage growth
B) are found on the surface of cancer cells and stimulate abnormal cell division
C) bind to cell-surface receptors and stimulate growth and development of target cells
D) convey messages between nerve cells
C
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A gene has been discovered in the genome of a eukaryote that is identical to a gene of a bacterium that the eukaryote normally engulfs and digests. This is probably due to
A. a mutation of an existing gene in the eukaryote that coindcidentally is the same as the bacterial gene. B. horizontal evolution. C. horizontal gene transfer. D. a mutation of an existing gene in the eukaryote that coindcidentally is the same as the bacterial gene and vertical evolution are correct. E. endocytosis of the bacterium by the eukaryote and insertion of bacterial DNA into the eukaryotic DNA; resulting in vertical evolution.
Which of the following is NOT a descendent
of stem reptiles?
a. mammals b. birds c. snakes d. fish e. all of these are descendents of stem reptiles
Which one of the following is TRUE regarding the "recycling" of hemoglobin?
A) The peptide chains are broken down into their constituent fatty acids. B) The iron atoms are returned to the red bone marrow. C) The heme groups are converted to urine by the kidneys. D) The peptide chains are transported intact to the bone marrow for reuse. E) The heme groups with their iron atoms are transported to the spleen.
A cohort is ____.
A. a group of individuals of the same species born during the same time interval B. any member of the same species C. a group of individuals with the same parents D. a group of individuals of the same sex E. any group of closely related individuals