The enzyme complexes associated with oxidative phosphorylation and the electron transport chain can be classified as ________ proteins.
A) integral membrane
B) peripheral membrane
C) lipid-anchored membrane
D) water-soluble
E) Both A and C
A) integral membrane
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Oxygen was a driving factor in the formation of eukaryotic cells
Indicate whether the statement is true or false.
When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Which of the following most directly contributes to this phenomenon?
A. no ATP to move cross-bridges B. no ATP to break cross-bridges between thick and thin filaments C. no calcium to bind to troponin D. no oxygen supplied to muscle E. no energy for the synthesis of actin and myosin
Answer the following statements true (T) or false (F)
1. Malpighian tubules of insects secrete rather than filter to eliminate waste products. 2. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans. 3. The blood supply to the loop of Henle also exhibits a countercurrent arrangement. 4. Based on phylogenetic analyses of the mineralcorticoid and glucocorticoid receptors and the presence or absence of their ligands (glucocorticoids and aldosterone) in certain vertebrates, it would appear that hormones always evolve prior to their receptors. 5. It would be reasonable to assume that environmental cues such as photoperiod and temperature might regulate animal reproduction.
How can chromatin be altered?