Which of the following can control mRNA stability?
A. The stop codon that is used to terminate translation in the mRNA
B. AU rich elements in the mRNA
C. distance of the stop codon to the polyA tail
D. number of A's in polyA tail
D
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After which step in the Gram-stain procedure are gram-positive bacteria first distinguished from gram-negative bacteria?
a. Crystal violet b. Iodine mordant c. Gram's decolorizer d. Safranin
Which of the following organisms would likely have the most complex nervous system?
a. sea turtle b. sea anemone c. earthworm d. Portuguese man-of-war
Why are mudflats difficult for organisms to live in the sediment compared to sandy beaches? a. The exposure time of mudflats threatens desiccation
b. There is an over-saturation that occurs in mudflats. c. The silt is porous. d. Packed silt interferes with circulation of water.
If photosynthesis produces cellular energy (ATP) from sunlight, why do plant cells also need to perform cellular respiration, a process that produces ATP from sugar?
a. Plant cells cannot make cellular energy at night; therefore, photosynthesis actually stores ATP energy as sugar, which can be then converted back to ATP at night by cellular respiration. b. Plant cells cannot make enough ATP from sunlight in photosynthesis; they need to perform cellular respiration too in order to make up the difference. c. Plant cells need cellular respiration to convert the sugars they absorb through their roots into ATP. d. Plant cells can't produce enough sugar from photosynthesis; cellular respiration is needed to produce the remaining sugar. e. Plant cells need cellular respiration to degrade the toxic products made in photosynthesis