Identify the structure labeled ‘C’

What structure is labelled 6 (bottom of the bracket)? 

In mitochondria, chemiosmosis moves protons (H+) from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis moves protons from

Which of the following statements best represents the relationships between the light reactions of photosynthesis and the “dark” reactions (Calvin cycle)?

The unlettered circle at the top of the figure shows a diploid nucleus with four chromosomes that have not yet replicated. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is black, and the other is gray. The circles labeled A to E show various combinations of these chromosomes. What is the correct chromosomal condition at prophase of mitosis?

Yeast can perform aerobic respiration or alcohol fermentation.  Explain why yeast would use fermentation when the alcohol is toxic to the organism. 

Cellular respiration harvests the most chemical energy from which of the following situations or processes?

If 4 glucose molecules are fed into glycolysis and then on through the Krebs cycle of a eukaryotic cell, how many molecules of ATP should be formed at the end of respiration?

Which of the listed statements describes the results of the following reaction? C6H12O6 + 6 O2 –> 6 CO2 + 6 H2O + Energy

The three parts of the brain stem are the: