Plants with a dominant sporophyte are successful on land partly because
A) having no stomata, they lose less water.
B) they all disperse by means of seeds.
C) diploid plants experience fewer mutations than do haploid plants.
D) their gametophytes are completely enclosed within sporophyte tissue.
E) eggs and sperm need not be produced.
Answer: D) their gametophytes are completely enclosed within sporophyte tissue.
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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.
The technique of Sanger sequencing takes advantage of the fact that dideoxynucleotides (nucleotides in which the 3' hydroxyl group is absent) act as
A. palindromic sites. B. restriction sites. C. chain terminators. D. probes. E. none of these
All animal cells contain the same type and quantity of organelles?
a. true b. false
chronic constipation can lead to enlarged and inflamed blood vessels of the anus known as
What will be an ideal response?