Which one of the following would be least likely to cross a lipid bilayer?
A. O2
B. CO2
C. ATP
D. H2O
E. N2
Answer Key: C
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A testcross is performed to determine if a specific individual is a carrier. The results generate a 50/50 ratio of phenotypes. The test subject is therefore ________.
A. homozygous recessive B. heterozygous C. heterozygous dominant D. homozygous dominant
Water has a molecular weight of 18 g per mole, and glucose has a molecular weight of 180 g per mole
Which of the following would have an approximately equal number of water and glucose molecules?
a. 1 g of water and 180 g of glucose b. 90 g of water and 9 g of glucose c. 180 g of water and 1 g of glucose d. 9 g of water and 90 g of glucose e. 90 g of water and 90 g of glucose
Many of the regions of the world where hunger is prevalent are also regions with hot and dry climates. What types of agricultural crops would you suggest that these regions attempt to grow?
A) C3 plants, such as wheat and rice B) C3 plants and C4 plants, such as corn and sugarcane C) C3 plants and CAM plants, such as prickly pear and pineapple D) C4 plants and CAM plants
A gene from a bacterium can be inserted into a corn plant, and the corn plant will make the same protein as the bacterium. This kind of gene transfer works because:
A) the bacterium and the corn plant are very closely related from an evolutionary perspective. B) the bacterium and the corn plant use the same process and genetic code for synthesizing proteins. C) the bacterium and the corn plant are able to interbreed and produce fertile offspring. D) the bacterium infects the corn plant's cells and uses its cellular machinery to produce the protein. E) every organism's DNA is identical.