Most enzymes are made up of ________.
A. nucleic acid
B. protein
C. carbohydrates
D. lipids
Answer: B
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Distances on a genetic map are measured in _____ units.
A. centromere B. DNA C. dalton D. centimorgan
The simplest cephalization occurs in:
a. earthworms b. planarian flatworms c. jellyfish d. vertebrates e. grasshoppers
Which of the following statements about sexually transmitted diseases (STDs) is false?
A. The incidence of chlamydia has increased as gonorrhea has decreased. B. Chlamydia is known as the "silent STD." C. Because chlamydia has both bacterial and viral characteristics, it cannot be treated with antibiotics. D. Gonorrhea, syphilis, and chlamydia are all transmitted through sexual contact. E. Syphilis can be transmitted from a mother to her fetus.
Which element is considered a macronutrient needed by plants?
A. Manganese B. Iron C. Copper D. Potassium E. Boron