Steroid hormones bind to receptors in the nucleus to activate or deactivate genes.
a. true
b. false
Answer: a. true
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Assuming geological evidence is accurate, life on Earth may have originated ____ billion years ago
a. 14 b. 4.6 c. 3.5 d. 2.1 e. 1.2
Most of the plant body is composed of
a. dermal tissue. b. root tissue. c. ground tissue. d. vascular tissue. e. cork tissue.
In statistics, what is a sample?
A) the mean of a population to be studied B) a small subgroup of a population to be studied C) the correlation between the two different experimental factors D) a range of values with a high probability of containing the true mean
You conduct a Limulus amebocyte lysate (LAL) assay on a sample of fluid that should be sterile. The result is positive! What does this indicate?
A) Endotoxin is present. B) The fluid is not sterile. C) Gram-positive bacteria are growing D) in the sample. E) Gram-negative bacteria are growing.