In an experiment, a scientist isolates mitochondria from living cells and suspends them in two different buffered solutions. One solution is maintained at ph 4, while the other solution is maintained at ph 9. the scientist finds that mitochondria in the solution at ph 4 continue to produce atp but those in the ph 9 solution do not. The results of the experiment can be used as evidence in support of which of the following scientific claims about mitochondrial activity
A. mitochondria in a cell-free environment are unable to convert thermal energy into atp,
B. the electron transport chain pumps electrons from the cytosol to the mitochondrial matrix
C. atp production in mitochondria requires a hydrogen ion gradient that favors movement of protons into the mitochondrial matrix
D. atp synthase molecules change their orientation in relation to the proton gradient across the mitochondrial membrane
Answer: C. atp production in mitochondria requires a hydrogen ion gradient that favors movement of protons into the mitochondrial matrix
You might also like to view...
Binary fission is:
A. cell division by meiosis B. cell division by mitosis C. cell division by simple splitting D. fluorescent in situ hybridization (FISH) E. exchange of genes between two cells
Dwarf plants are often short because they produce less gibberellin than taller varieties of the same species. What other scenarios might lead to dwarf plants? Choose all that apply.
_____ DELLA proteins that can't bind transcription factors as well. _____ GID proteins that can't bind gibberellin as well. _____ DELLA proteins that bind transcription factors more strongly than normal. _____ GID proteins that can't bind DELLA proteins as well.
When blood glucose is low, __________ is secreted, which calls for the liver to break down glycogen. Fill in the blank(s) with the appropriate word(s)
The pathogen Haemophilus influenzae B causes_____.
A) Meningitis in children B) Upper respiratory flu C) Endocarditis D) Genital chancroid