A researcher is looking at a cellular sample using an electron microscope. They observe that while mRNA is being transcribed from the DNA that ribosomes are binding to the mRNA to make proteins. Is this sample from a bacterial or a eukaryotic cell?
What will be an ideal response?
Bacteria. Since bacteria lack a nucleus, the ribosomes can bind to the mRNA as it's being synthesized and initiate translation.
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Prokaryotic cells are smaller than eukaryotic cells. What is a plausible explanation?
A. Prokaryotes lack the genetic material needed for protein synthesis. B. Prokaryotes have more diverse energy sources. C. Eukaryotes have compartmentalization, which allows for specialization. D. Prokaryotic cell walls limit their cell growth. E. Eukaryotes are immobile allowing them to grow larger.
Medullary breathing centers directly sense and respond to
A) blood pH and CO2 concentration. B) blood O2 concentration. C) alveolar O2 concentration. D) blood pH and O2 concentration.
Which element can only be converted by bacteria into a form that is available to plants and animals?
a) Carbon b) Oxygen c) Nitrogen d) Hydrogen
The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. the fossil record. B. divergent evolution. C. adaptation. D. convergent evolution. E. homology.