Genetic studies have identified an allele (32) that seems to provide protection against AIDS. Which of the following would most likely explain the reason why our population has this mutation?
A. Our bodies are designed to protect us
against a myriad of pathogens. Our immune
system was preparing for future viruses.
B. This mutation likely benefited the human
population against some other early
pathogen.
C. This mutation was initially harmful, but it
now affords us protection against AIDS.
D. Mutations that become prominent in a
population initially were neutral but then
become advantageous later on.
B
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In which of these mitosis phases is the replication of DNA accomplished?
This diagram shows the steps in mitosis, with labels to reference in the questions below.
A. A, which is prophase.
B. E, which is cytokinesis.
C. None of these answer choices is correct.
D. A, which is mitosis.
E. C, which is telophase.
Which factor allows bacteria species to adapt to environmental changes faster than fish?
A. smaller size B. smaller nutrient needs C. shorter generation time D. lack of a nuclear membrane
How does chemotherapy work as a treatment for cancer? Why is it not always effective?
What will be an ideal response?
The surface of each B lymphocyte is covered with about 250,000 to 500,000 identical copies of (BCR/MHC/TCR)
What will be an ideal response?