Diatoms have a special problem:
A. because their + and - mating strains are nonmotile and have to be dispersed by currents
B. because their heavy siliceous shells impede conjugation
C. because they must await a chemical signal from a fish before they can become mobile and search for mating partners
D. because their two halves fit like the lid and body of a pillbox and on repeated cell divisions the half that is overlapped gets progressively smaller
E. because the gametes experience difficulty in exiting the overlapping halves of their siliceous shells
D. because their two halves fit like the lid and body of a pillbox and on repeated cell divisions the half that is overlapped gets progressively smaller
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Which of the following is true about bacteria?
a. some bacteria have nuclei b. some bacteria have lipid bilayers enclosing their DNA c. some bacteria do not have DNA d. some bacteria do not have a cytoplasm e. some bacteria lack a plasma membrane
The oxidation of iodine and iodination of the thyroglobulin residues takes place in the presence of
a) Tyrosine Peroxidase b) Hydrogen Peroxidase c) None of the above d) All of the above
Which of the following is mismatched?
A) diapedesis — movement of leukocytes between capillary walls cells out of blood and into tissue B) chemotaxis — chemical degradation inside a phagolysosome C) abcess — a cavity created by tissue damage and filled with pus D) pus — tissue debris and dead phagocytes in a white or yellow fluid E) scab — dried blood clot over injured tissue
List 3 differences between plant and animal cells.