Describe two ways in which the unique membrane lipids of archaea protect them from environmental stress: one for pH and one for temperature.
What will be an ideal response?
Acidophililic archaea often have high amounts of tetraether lipids. Altered cell membrane structures decrease proton permeability. In addition, archaeal membranes are more stabilized to high temperatures by a variety of means. The terpenoid lipids of archaea are more saturated (i.e. have regular methyl groups) and are more linear than bacterial membranes. In addition, the tetraether lipids of archaea will be higher molecular weight compared to those of bacteria (i.e. they create a phospholipid monolayer in the cell).
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BAC stands for bacterial artificial chromosome
Indicate whether the statement is true or false
There are three aspects of entire populations that are important and often studied. Select the best choice from the ones listed.
A. a population's range, the pattern of spacing of individuals within the range, and the size that the population attains B. a population's range, the amount of food available within the range, and the size that the population attains C. a population's range, the parental care received by each offspring within the population, and the size that the population attains D. a population's range, the size home range of an individual in the population, and the parental care expended for each offspring
Which of the following is the ultimate source of chemical energy for all living organisms?
a. glucose b. photosynthesis c. GTP d. cellular respiration
Each cell is able to maintain an internal environment within a range that favors survival. This condition is called ___________.
A. metabolism B. homeostasis C. physiology D. adaptation E. evolution