A cladogram is the name of a taxonomic category into which organisms are placed when their evolutionary relationships to each other are being investigated.
a. true
b. false
Ans: b. false
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Sharks live in seawater. Their tissues are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes
How is that possible? A) Urea and trimethylamine oxide contribute to intra- and extracellular osmolarity in shark tissues. B) Metabolic intermediates of sharks tie up intracellular chloride and potassium ions. C) Their blood is hypotonic to their tissues. D) They excrete large quantities of electrolytes.
In septate fungi, what structures allow cytoplasmic streaming to distribute needed nutrients, synthesized compounds, and organelles throughout the hyphae?
A) multiple chitinous layers in cross-walls B) pores in septa C) complex microtubular cytoskeletons D) two nuclei E) tight junctions that form in cross-walls between cells
Which of the following is NOT a characteristic of a type II restriction endonuclease?
A) cleavage product can be either blunt or sticky ended but is always the same for an individual enzyme B) recognizes a specific palindromic site for cleavage C) recognition site length varies among enzymes but is always the same for an individual enzyme D) unable to cleave methylated DNA
The spindle is
A. the network of protein cables that will pull the chromatids to opposite ends of the cell. B. the new cell membrane as it reforms across the cytoplasm during cytokinesis. C. the protein that connects the duplicated chromosomes. D. the protein that DNA winds itself around.