A person who has AIDS contracts rare and often life-threatening infections because their helper T cell count is so low. Which of the following components of the immune response still respond to antigen despite the low helper T cell count?
a. Clonal expansion and antibody production
b. Apoptosis of infected host cells
c. Activation of cytotoxic T cells
d. Clonal selection of B cells
Ans: d. Clonal selection of B cells
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There are several reasons bacterial groupings based on morphology, physiology, and other metabolic characteristics may not be supported by molecular phylogenies produced from rRNA genes
Consider the statements below as possible reasons for this discrepancy. Obtaining the traditional groupings of bacteria requires sequencing and comparing the entire genome of each organism and cannot rely on single gene phylogenies generated from 16S rRNA datasets. A. true B. false
Compare the key differences between microevolution and macroevolution.
What will be an ideal response?
A steer must eat at least 100 pounds of grain to gain less than 10 pounds of muscle tissue. This illustrates
A) the first law of thermodynamics. B) the second law of thermodynamics. C) that some energy is destroyed in every energy conversion. D) that energy transformations are typically 100% efficient.
Which one of the following examples describes a communication mode that would be best for signaling over the greatest distance in a dark, densely forested environment?
A. Flashing of a male firefly to attract conspecific females B. Pheromones released by a female moth C. Waggle dance of a honeybee in a colony within the forest D. Territorial song of a male bird to repel other males E. Display of plumage of a male bird to attract females