Tamoxifen blocks the activity of estrogen in ____, but increases the activity of estrogen in ____
a. breast tissue; ovarian tissue
b. uterine tissue; ovarian tissue
c. uterine, tissue; breast tissue
d. breast tissue; uterine tissue
e. brain tissue; breast tissue
D
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When did life first appear on the planet?
A. 2.1 billion years ago B. 3.5 billion years ago C. 2.1 million years ago D. 3.5 million years ago
Which of the following is the most direct measure by which ventilation is regulated?
1.carbon dioxide levels in the blood
2.acid levels in the cerebrospinal fluid
3.oxygen levels near the carotid bodies
4.oxygen levels near the aortic bodies
Which of these is false about sudden cardiac arrest?
a. It happens more than 300,000 times annually in the United States. b. It affects only the elderly. c. Survival is greatly increased by starting CPR within four to six minutes. d. Prompt defibrillator use increases the chance of survival. e. None of these are false.
The studies of alkaptonuria provided the first evidence of a connection between genes and metabolism. Who conducted these studies?
a. Archibald Garrod b. Watson and Crick c. Frederick Griffith d. Beadle and Tatum