Explain why we say nearly all life on Earth ultimately depends on the sun for energy
What will be an ideal response?
Photosynthetic organisms convert light energy into chemical energy. While the photosynthetic
organisms use this chemical energy to drive their own cellular processes, other organisms consume
plants (or consume the herbivores that consumed the plants) to acquire chemical energy. Through this
process, nearly all organisms on earth can trace their energy back to the original photosynthetic
process, which was dependent on sunlight.
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Researchers primarily use transgenic animals to do which of the following?
a. Study the effects of recombinant genes. b. Extract and manipulate nucleic acids. c. Create multiple copies of mutant genes. d. Regenerate damaged tissue and organs.
Which of the following occurs in the last stage of viral replication?
a. New viral particles are released into the host organism. b. Viral RNA is used to make viral proteins, which infect the host. c. The viral envelope fuses with the cell membrane. d. The viral capsid degrades and nucleic acid is released.
Packaging of prokaryotic chromosomes
A) doesn't involve histone or histone-like proteins. B) involves large regions of positively supercoiled DNA but lacks histones or histone-like proteins. C) is very simple and lacks higher-level structure, such as looped domains. D) involves structural RNA molecules that contribute to the formation of looped domains. is essentially the same as eukaryotic DNA packaging.
Which of the following statements about type I reactions is FALSE?
A) They involve helper T cells. B) They involve IgE antibodies. C) The symptoms are due to histamine. D) Antibodies bind to mast cells and basophils. E) The symptoms occur soon after exposure to an antigen.