Around hydrothermal vents at depths of more than 2,500 m, scientists have found colonies of giant tube-dwelling worms. The worms contain symbiotic prokaryotes that are able to use hydrogen sulfide as an energy source for the synthesis of organic matter from carbon dioxide. The bacteria are _____.
Fill in the blank(s) with the appropriate word(s).
Answer: chemoautotrophic
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Which of the following statements about vitamins is false?
a. Water-soluble vitamins include vitamin C. b. Taking too many vitamins, particularly fat-soluble vitamins, can be harmful. c. Fat-soluble vitamins include vitamin B2. d. Water-soluble vitamins, if consumed in excessive amounts, will be excreted in the urine. e. Water-soluble vitamins are picked up by individual cells from capillary beds.
If too little time has passed for crossing over to randomize haplotypes or if natural selection favors certain haplotypes, what would you expect to see?
What will be an ideal response?
A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is TRUE?
A) The solution in the beaker is hypertonic relative to the solution in the balloon. B) The solution in the balloon is isotonic; the solution in the beaker is hypertonic. C) The solution in the balloon is hypotonic relative to the solution in the beaker. D) The solution in the balloon is hypertonic relative to the solution in the beaker.
In a nutritionally balanced diet, the main source of energy is _______.
a) proteins b) carbohydrates c) lipids d) vitamins and minerals