The above figure is of one of the most poisonous
mushrooms. Which of the following is true?
a. It is a club fungus.
b. It is called death cap.
c. It is responsible for about 90% of all mushroom
poisonings.
d. It kills by causing liver and kidney failure.
e. All of these are true.
Answer: e
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Mutations are the original source of new alleles, but many are __________ or __________. Fill in the blank(s) with the appropriate word(s)
The following table presents the effect of different media on the growth response of tryptophan mutations in Salmonella typhimurium (+ = growth, - = no growth)
Medium Supplemented with Strain No Supplement IGP AA IN TRY trp-8 - + + + + trp-2 - + - + + trp-3 - - - + + trp-1 - - - - + (a) Construct the biochemical pathway for the compounds IGP, AA, IN, and TRY based on these data. (b) Place strains of bacteria (mutations) in the appropriate steps in the pathway. (c) In bacteria, it is often possible to make partial diploid strains. Assume that a diploid strain was made containing the complete genomes of the trp-2 and trp-1 strains. Would this diploid strain be able to grow on the unsupplemented medium? Explain your answer.
What is the name of the main embryonic cell layer from which the muscles of the body wall are derived in most metazoans?
a. mesoderm b. endoderm c. ectoderm d. mesoglea
The movement of water through a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration is called ________.
a) solubility b) osmosis c) metabolism d) denaturation e) diffusion