One way an amino acid differs from a lipid is that the amino acids contain
A. carbon.
B. hydrogen.
C. nitrogen.
D. oxygen.
C. nitrogen.
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The use of birth control pills (oral contraceptives) _____
A) reduces the incidence of ovulation B) prevents fertilization by keeping the sperm and egg physically separated by a mechanical barrier C) prevents implantation of an embryo D) prevents sperm from exiting the male urethra E) prevents oocytes from entering the uterus
Which of the following statements about DNA replication is false?
A. The two strands are separated. B. Each existing strand is used as a template for making a new strand. C. Synthesis of both new strands is in the 5' to 3' direction. D. The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus.
What type of molecule would you not expect to find associated with a cell's membrane?
A. Carbohydrate B. Phospholipid C. Nucleic acid D. Protein
Who proposed that there had been a single supercontinent on Earth which led to the idea of continental drift?
a. Edward Suess b. Sir Francis Bacon c. Alfred Wegener d. The Laurasia