The bonds between the atoms that make up water molecules are called
a. covalent bonds.
b. hydrogen bonds.
c. ionic and covalent bonds.
d. covalent and hydrogen bonds.
Ans: a. covalent bonds.
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A new virus has recently been identified that has been linked to certain birth defects. A pregnant woman is infected with this virus in the fifth month of her pregnancy. However, at birth, the infant shows no signs of the characteristic birth defects. What is the most likely explanation?
A) The virus actually doesn't cause birth defects. B) The woman was likely infected after the virus' critical period. C) The woman was actually infected by a different virus. D) The woman was likely infected during the virus' critical period.
Select the correct sequence of events involved in regulating secretion of thyroid hormones
1. pituitary releases thyroid-stimulating hormone (TSH) 2. hypothalamus secretes thyroid-releasing hormone (TRH) 3. thyroid hormones inhibit long-term TRH secretion 4. thyroid secretes thyroid hormones 5. thyroid hormones inhibit TSH secretion
a. 1, 2, 4, 5, 3 b. 2, 1, 4, 5, 3 c. 3, 1, 4, 5, 2 d. 3, 4, 1, 2, 5 e. 2, 4, 5, 1, 3
What is the half-life of an element?
a. The distance from the atomic nucleus to where 50 percent of its electrons can be found b. Half of the length of time required for an element to completely decay into another element c. The period of time required for 50 percent of an element to decay into another element d. The quantity of an element sufficient to kill half of the organisms to which it is exposed
When making scientific decisions in one's life, it is best to ask questions, gather and evaluate information and evidence, and carefully consider the sources of the material. This process is called ________
Fill in the blank(s) with correct word