Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in psychrophiles
What will be an ideal response?
Answer: Non-psychrophiles do not thrive in the cold environment, in part due to predominantly having large or saturated fatty acid chains in their cytoplasmic membrane, which become increasingly rigid and waxlike with colder temperatures. The psychrophiles have higher relative concentrations of short and unsaturated fatty acids in their membrane and therefore maintain a semi-permeable membrane when exposed to less heat.
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Answer the following statements true (T) or false (F)
1. The main purpose of polymerase chain reaction (PCR) is to generate many copies of a region of DNA. 2. DNA microarrays (gene chips) are only capable of monitoring the expression of one gene at a time. 3. Chromosomes within somatic cells of mammals cannot be cloned because they accumulate irreversible genetic changes. 4. To study the promoter of a gene, a researcher should use a cDNA library.
Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,
a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called
a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.
There are four bacteria in an egg salad that is left out at room temperature. After two hours, how many bacteria will be in the egg salad?
a. 256 b. 250 c. 245 d. 260
At the time life arose on Earth, Earth's atmosphere contained all but which of the following?
a. H2 b. N2 c. O2 d. H2S