Transgenic bacteria are presently used to make ________ to protect from a possible infection by a disease-causing organism
Fill in the blank(s) with correct word
vaccines
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In the logistic growth model, as the number of individuals in the population (N) approaches the carrying capacity (K), what happens to the intrinsic rate of growth (ri)?
A. It will be affected by an increased birth rate. B. It will be affected by a decreased death rate from predation. C. It will be affected by increased competition with other species. D. It will be affected by increased competition within the species. E. It will not change.
The pulmonary veins ____
a. receive blood from the lungs b. drain blood from the liver c. carry blood to tissue d. carry oxygenated blood e. are found only on the right side of the body
Which of the following hormones stimulates an increase in basal metabolic rate as a tropic hormone?
A) prolactin B) follicle-stimulating hormone C) thyroid-stimulating hormone D) adrenocorticotropic hormone
Carriers of cystic fibrosis have some protection against intestinal infections such as cholera. However, people with two copies of the cystic fibrosis allele develop a life-threatening disease. The mutant allele is very common in people of northern European descent because of
A. disruptive selection. B. directional selection. C. artificial selection. D. sexual selection. E. stabilizing selection.