How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4?
A) 1
B) 2
C) 3
D) 4
B
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Atherosclerosis is now known to be a disease of
inflammation. Which of the following oral bacteria can also be involved in this disorder? a. Porphyromonas gingivalis b. Streptococcus mutans c. Lactobacillus spp d. Staphylococcus spp e. all of these
During a normal female reproductive cycle, the hormone produced only after ovulation is ________, made by the ________
A) progesterone; corpus luteum B) follicle-stimulating hormone (FSH); anterior pituitary C) gonadotropin-releasing hormone (GnRH); hypothalamus D) luteinizing hormone (LH); anterior pituitary
The original cell was thought to have arisen from the enclosure of self-replicating _______ by a phospholipid membrane.
a. DNA b. carbohydrate c. protein d. RNA
Iron is an important element in human body cells. If iron has an atomic number of 26, what does this tell you about this element?
A) An iron atom has 13 electrons and 13 protons. B) An iron atom is unable to become an isotope. C) An iron atom has 26 protons. D) An iron atom has 13 protons and 13 neutrons.