Which of the following contain 70S ribosomes?
a) Prokaryotes
b) Mitochondria
c) Mitochondria and chloroplasts
d) Prokaryotes, mitochondria, and chloroplasts
Ans: d) Prokaryotes, mitochondria, and chloroplasts
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________ is to xylem as ________ is to phloem
A) Sclerenchyma cell; collenchyma cell B) Apical meristem; vascular cambium C) Vessel element; sieve-tube member D) Cortex; pith E) Vascular cambium; cork cambium
Converting 1 molecule of glucose to 2 pyruvate molecules generates the net formation of this many ATP during cellular respiration:
A. 6 molecules of water B. 3 molecules of ATP C. 2 molecules of ATP D. 72 - 76 molecules of ATP E. 36 - 38 molecules of water
Why is widespread resistance to tuberculosis (TB) not likely to evolve any time soon?
A) Only a small percentage of people who are nonresistant to the bacterium will become infected and die from TB, so the variant will stay in the population. B) TB is highly fatal, so those who are nonresistant will die quickly. C) Humans are no longer evolving, so the population cannot develop widespread resistance. D) It would be too expensive to genetically engineer people to give them the resistance gene.
The combination of large numbers and small size collectively gives alveoli what characteristic that is essential to their function?
A) easy inflatability B) low surface area C) high surface area D) low air resistance