Crossing-over allows the reassortment of linked genes. a. true b. false

True

Crossing over involves homologous chromosome pairs "crossing over" and exchanging genetic information.

I have attached an image that might help you understand the concept a bit better.

I hope this helps! I'm happy to answer any other questions you might have :)

[Image sourced from: http://www.qsstudy.com/biology/define-crossing-importance]

Answer;

The pH of the intermembrane space must be lower than the pH of the mitochondrial matrix.

Explanation;During chemiosmosis 10 protons are shuffled from the matrix to intermembrane space. This generates a pH gradient across the inner mitochondrial membrane, with the pH higher in the matrix than in the cytosol, where the pH is generally close to 7.The pH of the intermembrane space is lower than the pH of the mitochondrial matrix. The electrochemical proton gradient across the inner mitochondrial membrane is used to drive ATP synthesis in the critical process of oxidative phosphorylation.