Why is a molecule of H2 more stable than an atom of hydrogen?
A) The H2 molecule shares the 2 electrons in the outermost shell.
B) The H2 molecule has 4 electrons instead of 2.
C) The H2 molecule has a vacancy in the outermost electron shell.
D) Two pairs of electrons are shared in a strong double bond.
E) The innermost shell is more stable when it has 1 electron in it.
A) The H2 molecule shares the 2 electrons in the outermost shell.
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During swallowing, the _____ covers the entrance to the larynx. This structure is identified and labeled as letter _____
in the above diagram.
a. epiglottis; E b. pharynx; B c. glottis; C d. epiglottis; C e. trachea; E
Which of the following is composed of a 1:2:1 ratio of carbon to hydrogen to oxygen?
a. carbohydrate b. protein c. lipid d. nucleic acid e. steroid
Which of the following endocrine glands are incorrectly paired with its target?
a. pancreas?liver b. hypothalamus?pituitary c. pineal gland?hypothalamus d. adrenal medulla?kidney tubules e. thyroid gland?bone
Which of the following represents the strongest evidence that two of the three middle ear bones of mammals are homologous to certain reptilian jawbones?
A) They are similar in size to the reptilian jawbones. B) They are similar in shape to the reptilian jawbones. C) The mammalian jaw has fewer bones than does the reptilian jaw. D) These bones can be observed to move from the evolving jaw to the evolving middle ear in mammalian embryos.