As a general rule, for each jump up in trophic level, about how much does the available energy drop?
A) 90 percent
B) practically 100 percent
C) 30 percent
D) 50 percent
E) 10 percent
Answer: A
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Which letter points to the counterpart of a stem
in a flowering plant? a. A b. B c. C d. D e. none of these
In long-day plants,
a. extended daylight produces more Pfr. b. the number of hours of darkness must be less than a critical value. c. the interruption of the dark period does not upset the flowering sequence. d. flowering is limited to summertime under normal conditions. e. all of these occur.
What are the four nitrogenous bases found in RNA?
a. uracil, guanine, cytosine, thymine (U, G, C, T) b. adenine, guanine, cytosine, thymine (A, G, C, T) c. adenine, uracil, guanine, cytosine (A, U, G, C) d. alanine, threonine, glycine, cysteine (A, T, G, C)
Cells conserve energy and resources by making active proteins only when they are needed. If a protein is not needed, which of the following methods of control would be the most energy-efficient?
A. degrade the protein after it is made B. prevent translation of the mRNA C. block transcription D. degrade the mRNA after it is made