Loss of brca activity contributes to cancer because
a. without brca, dna damage-sensing kinases cannot establish a cell cycle checkpoint
b. without brca, cells cannot perform homology directed repair of double-stranded breaks
c. without brca, dna polymerase can't use its proof-reading activity
d. without brca, cells can't remove oxidized bases

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

a physical change is being made.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.