When individuals are first infected with HIV, early symptoms are flu-like, but when the immune system responds, people recover from these flu-like symptoms and then can become asymptomatic for as long as 10 years
However, HIV eventually wins its battle with the immune system, and individuals will eventually show symptoms of AIDS. Why does HIV eventually win its battle with the immune system? A) HIV is a latent virus and only actively reproduces when conditions are perfect.
B) HIV is constantly reproducing but doesn't produce the vital toxins necessary to kill T4 cells until a certain period of time has passed.
C) During the asymptomatic period, new variants of HIV arise, and antibodies produced against earlier variants don't recognize the new variants.
D) The population of HIV doesn't change during the asymptomatic period, and therefore, antibodies that were produced originally against it are destroyed by the spleen.
C
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While synthesizing a new blue pigment, a chemist notices that the new compound congregates between an aqueous (water) environment and a hydrophobic environment. When added to a mixture of oil and water, the pigment creates a blue ring around the droplets of oil. Which of the following statements best describes this new pigment?
A) The pigment is a polar molecule and is forming hydrogen bonds with both the water and oil molecules. B) The pigment is hydrophilic and will not form hydrophobic bonds with the oil. C) The pigment is amphipathic, having polar and nonpolar regions. D) The pigment is neither polar nor nonpolar; it is apolar. E) The pigment is probably hydrophobic and is attempting to bond with the oil.
The bond in table salt (NaCl) is ____
a. polar b. ionic c. covalent d. double e. nonpolar
The short nucleotide sequence that base-pairs with any complementary sequences in DNA during PCR is a(n) ____
a. primer b. exon c. intron d. restriction enzyme e. polysome
In reproductive cloning, a sperm is not used, but an egg is still required. Why?
A) Udder cells will fuse only with egg cells. B) Surrogate mother animals will develop only embryos derived from their own eggs. C) Egg chromosomes are required for embryonic development. D) Egg proteins are required for embryonic development.