Often HIV and CD4s are confused. Describe and distinguish
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HIV is the human immune deficiency virus, which causes AIDS. HIV begins by preferentially binding to helper T cells with the CD4 receptor. The number of CD4-bearing cells diminishes as the disease progresses, and is often used as an indication of the stage of HIV infection. As the helper T cell population diminishes, fewer B cells become activated, and fewer cytotoxic T cells are activated. Further, HIV infects macrophages, and these can cross the blood brain barrier, and cause neurological problems in advanced stages of HIV infection.
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Explain why a lack of oxygen in our cells causes less energy to be available to do cellular work
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Rosalind Franklin did not share in the Nobel
Prize for the discovery of the structure of DNA because
a. she was a woman. b. her contributions were minimal. c. she was not liked by James Watson. d. her ideas were stolen by Maurice Wilking. e. she died of cancer before the award was given.
What makes certain red algae appear red?
A) They live in warm coastal waters. B) They possess pigments (phycoerythrin) which reflects and transmits red light. C) They use red light for photosynthesis. D) They lack chlorophyll. E) They contain the water-soluble pigment anthocyanin.
Which of the following adaptations was a key to allowing conifers to be successful in diverse terrestrial habitats