Characteristics that have arisen in organisms as a result of common evolutionary descent are said to be ________ characteristics.
A. homologous
B. ancestral
C. homoplastic
D. adaptive
E. derived
Answer: B
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Some diseases can result from defective transport across the membrane. For example, cystic fibrosis results from a chloride ion transporter that does not function. Which of the following would be affected when this transporter does not function?
A. the chloride concentration gradient B. the electrical gradient of the cell C. Both a and b D. Neither a nor b
A compound similar to auxin, 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), has been used
A. as a fertilizer for corn and wheat. B. as a spray to promote flowering of pineapple. C. as an organic substitute for chlorine bleach. D. to detoxify the dangerous poison dioxin. E. an herbicide for killing woody seedlings and dicot weeds.
Glycolysis results in a net gain of two ATP formed by direct ________ of ADP molecules using phosphates taken from glycolytic intermediates
Fill in the blank(s) with the appropriate word(s).
Proteins carry out much of the biochemistry of life, including DNA replication, but DNA stores the information needed to build correct proteins. Early life forms would have needed both proteins and DNA, but neither can exist without the other
The RNA world hypothesis is an appealing solution to this problem, because it states that ________. A) RNA can evolve into DNA by natural selection B) proteins can store the information needed for their own synthesis C) RNA is more chemically stable than DNA D) nucleotides of RNA are chemically similar to amino acids E) some RNA molecules both store information and catalyze chemical reactions