Research indicates that compared to the genomes of bony fish, the elephant shark genome contains ____ the genes
necessary for bone formation.
a. none of
b. half of
c. most of
d. all but one of
e. double
ANSWER: d
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Osmoconforming animals, such as the spider crab, that live in the open ocean show little ability to withstand large variations in salinity, while coastal animals, such as the closely related fiddler crab, show great ability to withstand large salinity changes. Explain why this is the case, considering the relevant abiotic features of both habitats
What will be an ideal response?
Which of the following is NOT typically found in primary plant cell walls?
a. lignin b. hemicelluloses c. pectin d. cellulose e. chitin
Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?
A. A bacterium in Great Salt Lake B. A bacterium in a fresh-water lake C. A protozoan in a fresh water lake D. All of the above have problems in maintaining electrolyte and fluid balance within the cell.
Which term refers to an extended period of torpor that an animal enters during the winter when the environment is too cold and food is too scarce?
a. hypothermia b. thermal acclimatization c. hibernation d. estivation