What is directly responsible for pumping protons out of the matrix in the mitochondria?

a. protein complexes I, II, III, and IV
b. cytochrome c and ubiquinone
c. protein complexes I and III
d. protein complexes I, III, and IV
e. NADH and FADH2


D

Biology & Microbiology

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A ______________ group consists of the most recent common ancestor and some of its descendants. 

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Aquaporins are ____

a. channel proteins for water b. carrier proteins for solutes c. channel proteins for solutes d. carrier proteins for water e. carrier proteins for water and solutes

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What features of a desert ecosystem control the communities which can survive in a desert?

A. amount of light B. temperature C. amount of water D. All answers are correct. E. amount of usable habitat

Biology & Microbiology

? ? Figure 35.9A ? The following question refers to the figure above of a human femur. Spongy bone is indicated by the letter ____.

A. A B. B C. C D. D E. E

Biology & Microbiology