Plants have been genetically engineered for all of the following reasons EXCEPT
A. to have a higher vitamin A content.
B. to reduce food spoilage.
C. to produce human proteins.
D. to make the plant more resistant to pests.
E. All of the choices are correct.
Answer: E
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Who of the following provided the evidence needed to discredit the concept of spontaneous generation?
A. Koch B. Pasteur C. Semmelweiss D. Lister
Photons excite electrons in chlorophyll. These electrons are then trapped by the primary electron acceptor. How does the photosystem replace the trapped electrons?
a) The photosystem replaces its light-excited electrons by extracting electrons from oxygen. b) These electrons are not replaced. A molecule of chlorophyll in a photosystem is used up with each electron transferred. c) The photosystem replaces its light-excited electrons by extracting electrons from water. d) The photosystem replaces its light-excited electrons by extracting electrons from carbon dioxide. e) These electrons are not replaced. There are hundreds of millions of free electrons available in the photosystem at any particular time.
Pollen and seeds evolved in response to
A) living on dry land. B) an increase in pollinators. C) seed predators. D) living in a moist environment. E) the evolution of flowers.
Cell walls of most archaea and bacteria contain peptidoglycan.
Answer the following statement true (T) or false (F)