Small size, in general, is necessary for all cells, whether prokaryotic or eukaryotic. Why?
a. The surface area to volume ratio limits the size of all cells.
b. If cells were larger, they would be eaten by predators.
c. Size is limited by electron orbitals.
d. They are limited by the size of the ecosystem.
a. The surface area to volume ratio limits the size of all cells.
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Why is nitrogen fixation by prokaryotes essential to life on Earth?
a. It removes nitrogen from the soil. b. It converts atmospheric nitrogen to a non-toxic form. c. It provides nitrogen sources for plants and animals. d. It provides an energy source for photosynthesis. e. It allows for the breakdown of complex macromolecules.
All of the following structures are associated with an intestinal fold except: a. salivary secretions
b. lymph vessel. c. microvilli. d. blood vessel. e. villi.
Streptomycin, an aminoglycoside, inhibits protein synthesis
A. by preventing the formation of the initiation complex. B. by binding to the ribosome, preventing translocation due to interference with the attachment of mRNA. C. by interfering with both the initiation and elongation stages of translation. D. by binding to the tRNA preventing peptide bond formation between amino acids.
Pulmonary tuberculosis in an otherwise healthy individual may indicate a compromised immune system or HIV infection.
Answer the following statement true (T) or false (F)