Molecules such as H-H and O=O are held together by ____
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
ANSWER: e
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A 7-year-old girl was at summer camp and dove into the lake many times. She complained that water went up her nose a few times. Several days later she is unresponsive and comatose and rushed to the hospital. A cerebrospinal fluid (CSF) specimen is drawn, and several motile amebae are observed. She is most likely suffering from an infection with which of the following pa-rasites?
a. Plasmodium vivax b. Naegleria fowleri c. Ascaris lumbricoides d. Hymenolepis nana
The presence of hydrochloric acid in the stomach serves to ____
a. inactivate pepsinogen
b. digest fats c. activate amylase d. kill bacteria e. emulsify proteins
What is the start codon for translation?
a. CUG b. TAG c. UAA d. ATG e. AUG
The vascular tissues of plants are composed of
a. epidermis and ground meristem. b. ground tissue. c. xylem and phloem. d. arteries and veins. e. sap and water.