The surface area of a plant's root system is substantially larger than the surface area of its shoot system. The extensive surface area of roots is an adaptation associated with _____
A) contact with soil particles for mineral and water absorption
B) the internal structure of the vascular tissue in roots
C) the storage of nutrients within the root system
D) the release of carbon dioxide generated by photosynthesis
Answer: A
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Steroid hormones
a. are proteins. b. include testosterone, estrogens, and cortisol. c. never activate second messengers. d. never alter membrane transport of ions. e. fit all of these descriptions.
Which of the following ideas was most commonly held in the eighteenth century?
A. the fixity of species B. genetic change through mutation C. changes in a species through adaptation to the environment D. evolution by natural selection over time
Which of the following is the most accurate statement about the relationship between gene duplication and mobile genetic elements?
A) The most common way that genes are duplicated is by the activity of mobile genetic elements. B) A duplicated gene is an example of one kind of mobile genetic element. C) Mobile genetic elements can cause gene duplication, but most gene duplication events are caused by other mechanisms. D) Gene duplication is one kind of genomic defense against the spread of mobile genetic elements.
In the early years of the twentieth century, ____ proposed that some genetic disorders and abnormalities of
metabolism are related. a. Sir Archibald Garrod b. Francis Crick c. Linus Pauling d. Linda Bartoshuk e. Gregor Mendel