Genes whose expression (or abnormal expression) cause cancer are called ________.
A. cancer genes
B. carcinogens
C. progenes
D. oncogenes
Answer: D
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Imagine you were the manager of a national park with cheetahs. The cheetahs feed primarily on gazelles, while the gazelles eat grass. It takes an acre of grassland to feed one gazelle, and it takes ten gazelles to feed one cheetah. How much grassland do you need to support a population of 10 cheetahs?
A. 10 acres B. 200 acres C. 500 acres D. 100 acres
Which soil horizon has no organic matter or weathered rock?
a. O Horizon b. A Horizon c. B Horizon d. C Horizon e. bedrock
Blood pressure is carefully regulated by a negative feedback control system in the body. When the blood pressure falls below a set point, this decreased pressure is detected by baroreceptors (pressure receptors) in the aorta and carotid arteries
These receptors send signals to a region of the brain known as the medulla oblongata. This region of the brain integrates incoming signals and sends signals to the heart to increase the strength of contractions and to the blood vessels, to constrict arterioles so as to increase the blood pressure, returning it to normal. Based on this information, identify each of the parts of this control system: a) controlled variable b) sensor c) control center d) effector(s)
In a hypersensitive response:a
long-lasting resistance is built up throughout the plant. b. the axillary buds break dormancy. c. cryptochrome is synthesized. d. jasmonic acid activates enzymes. e. the infected area is sealed off by necrotic lesions.