What is gene regulation?
A. Mechanisms that turn on and off mitosis in the cell cycle
B. Mechanisms that regulate the replication of DNA
C. Mechanisms that regulate which genes get copied
D. Mechanisms that turn on and off specific genes to change which proteins are made
Answer: D
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Why do scientists consider HIV to be an emerging virus?
A) HIV infected humans long before the 1980s, but it has now mutated to a more deadly form. B) HIV mutates rapidly making the virus very different from HIV in the early 1980s. C) HIV suddenly became apparent and widespread in the 1980s. D) HIV is now starting to cause diseases other than AIDS, such as rare types of cancers and pneumonias.
Choose the two primary factors that contribute to the resting membrane potential of a neuron.
_____ K+ leak channels make the cell membrane more permeable to K+. _____ The sodium-potassium pump exports 3 K+ from the cell for every 2 Na+ it imports _____ Na+ leak channels make the cell membrane more permeable to Na+. _____ K+ leak channels cause a higher concentration of K+ outside the cell. _____ The sodium-potassium pump exports 3 Na+ from the cell for every 2 K+ it imports
Animals exchange heat with their environment by which of the following processes EXCEPT?
a. conduction b. radiation c. evaporation d. convection e. thermoregulation
When genotypes at one locus of a chromosome are nonrandomly associated with the genotypes at another locus of the same chromosome, the two loci are ________
A) in linkage equilibrium B) in linkage disequilibrium C) nonrandomly associated D) None of the above.