Which of the following is not needed in a reproductive cloning procedure?
A) an egg cell B) a sperm cell C) a surrogate mother D) a diploid cell
Answer: B
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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.
Most membrane functions are performed by _____
a. proteins c. nucleic acids b. phospholipids d. hormones
The most common route of transmission for true pathogenic fungi is ingestion of spores.
Answer the following statement true (T) or false (F)
Why do rhinoviruses infect the upper respiratory tract, particularly the nose, but not the lower respiratory tract?
A. They replicate most effectively at the cooler temperatures of the upper respiratory tract. B. IgA antibodies in lower respiratory tract secretions prevent them from becoming established in the lower respiratory tract. C. The prevalence of alveolar macrophages in the lower respiratory tract prevents them from becoming established there. D. They are unable to attach to receptors on the pulmonary cells in the lower respiratory tract.