The only survivors of a colony on Venus are a man and a woman, who happen to be both originally
from the southern Ukraine. Their descendants will show the effect of
a. genetic drift.
b. punctuated equilibrium.
c. excessive mutation.
d. heterozygote advantage.
e. frequency-dependent selection.
A
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What special adaptation(s) has/have Thermoplasma evolved to survive in hot acidic environments?
A) Thermoplasma stabilize their cytoplasmic membrane by incorporation of tetraether lipoglycans in the cytoplasmic membrane. B) Thermoplasma have a reinforced cell wall containing basic amino linkers in the peptidoglycan. C) Thermoplasma excrete hydrogen ions and import hydroxyl ions. D) Thermoplasma are highly motile to avoid destruction.
Which of the following statements about the modified Ti plasmid used to make transgenic plants is NOT accurate?
A. It is derived from a plasmid found in the bacterium Agrobacterium tumefaciens. B. It causes crown gall formation. C. It contains a screenable marker gene. D. It contains a T-DNA region that integrates into the plant cell's genome. E. It contains unique restriction enzyme recognition sites for inserting a gene of interest.
Beer, wine, and spirits are produced as the result of cellular metabolism by:
A) bacteria occurring in the absence of free electrons. B) yeast occurring in the absence of oxygen. C) yeast occurring in the absence of free electrons. D) bacteria occurring in the absence of oxygen. E) pyruvate occurring in the absence of oxygen.
Consider an analogy between reaction-coupling and money. In a simple economy, barter provides a means of direct exchange of material goods
For example, the owner of a cow may have excess milk and need eggs, whereas a chicken owner has excess eggs and needs milk. Provided that these two people are in close proximity and can communicate, they may exchange or barter eggs for milk. But in a more complex economy, money serves as a mediator for the exchanges of goods or services. For instance, the cow owner with excess milk may not need other goods until three months from now, or may want goods from someone who does not need milk. In this case, the "energy" from providing milk to the economy can be temporarily "stored" as money, which is a form of "energy" used for many transactions in the economy. Using barter and money as analogies, describe two mechanisms that can serve to drive an unfavorable chemical reaction in the cell.