Scientists believe that mitochondria may have evolved from ancient bacteria because ____
a. both are surrounded by a cell wall
b. both have their own DNA and ribosomes
c. the shapes and size of both are exactly the same
d. both have cristae to increase surface area
e. both have five chromosomes
ANSWER: b
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Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?
A) One of the daughter cells, but not the other, would have radioactive DNA. B) Neither of the two daughter cells would be radioactive. C) All four bases of the DNA would be radioactive. D) Radioactive thymine would pair with nonradioactive guanine. E) DNA in both daughter cells would be radioactive.
Which of the following mechanisms increases genetic diversity?
a. crossing-over between chromosomes during meiosis b. independent assortment of chromosomes during meiosis c. random DNA mutations d. crossing-over between chromosomes and independent assortment of chromosomes during meiosis e. crossing-over between chromosomes, independent assortment of chromosomes during meiosis, and random DNA mutations
Differentiate between the problems and effects of global warming and ozone depletion. What will be an ideal response?
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