If there are 64 potential codons that code for various amino acids but only about 20 specific amino acids, what must be true about the genetic code?
A) Most of the codons are not used.
B) There are two codons for each amino acid, and the rest are stop codons.
C) All are used, but bacteria and plants each have 20 different amino acids.
D) Multiple codons code for the same amino acid.
D
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Which of the following statements best defines cavitation?
A. Cavitation is the presence of air bubbles in the xylem. B. Cavitation is the presence of sugars in the xylem. C. Cavitation describes the process of xylem vessel collapse. D. Cavitation is the presence of ice in the xylem. E. Cavitation is the presence of pressure in the xylem.
In what type of environment would you expect to find a plant that spends most of its resources on defenses, rather than growth? Select all correct choices
A. in the nutrient-poor soil of a tundra B. in the clay soil of a rainforest C. on well-fertilized farmland D. in the sandy soil of a rainforest
Which of the following is incorrectly matched?
A. simple cuboidal; kidney tubules B. stratified columnar; urethra C. stratified squamous; esophagus D. simple columnar; intestines E. simple squamous; nasal passages
Which of the following diseases are caused by an ascomycete? Check all that apply.
_____ apple scab _____ wheat rust _____ powdery mildew _____ chestnut blight _____ Dutch elm disease