Collagen Provides Tensile Strength in Plant Tissues. A yeast cell that enters mitosis prematurely before reaching normal size in G2 will appear as elongated cells.
a. true
b. false
Ans: b. false
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The process by which a bacterium uses a sex pilus to transfer genetic information to another bacterium is
A. meiosis. B. mutation. C. mitosis. D. conjugation. E. sexual reproduction.
The Biological Species Concept:
a) is the best and most accurate species concept. b) states that species that live together will eventually start breeding. c) states that a species is any group which shares similar DNA. d) states that any organisms that are biologically similar constitute a species. e) defines a species as any group of actually or potentially interbreeding species that produce viable offspring
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.
In the Krebs cycle, the pieces of the starting glucose molecule (now pyruvate) are completely broken apart to produce carbon dioxide. What happened to all the energy that was contained in the bonds of the original glucose molecule?
a) It was used to turn oxygen gas into water. b) It was all used in the Krebs cycle to make ATP. c) It was lost as heat. d) It is still in the bonds of pyruvate. e) It was transferred into NADH and FADH2 and some ATP.