Answer the following questions true (T) or false (F)
1. Cells harvest energy from nutrients by stripping electrons from them. In other words, the nutrients are oxidized.
2. By the end of the Krebs cycle, every carbon originally in glucose is converted into carbon dioxide.
3. The main energy benefit of the Krebs cycle is the mass production of both ATP and the reduced factors NADH and FADH2.
1. TRUE
2. TRUE
3. FALSE
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The plants and animals present in a region from which the trees were removed ten years earlier represent ____
a. primary succession b. a climax forest c. pioneer species d. secondary succession e. species introduction
Enzymes that are expressed at a constant level all the time are said to be ________.
A. constitutive B. repressible C. attenuated D. inducible
In a lichen that is in a mutually beneficial relationship, what does the photobiont usually receive?
a. aid in sexual reproduction b. shelter from radiation and desiccation c. protection from herbivory d. enhanced dispersal of offspring
Which of the following is a non-protein carrier found in some electron transport chains?
A) flavoproteins B) metal-containing proteins C) ribozymes D) cytochromes E) ubiquinones