Cell Biology Answers

Explain how ATP performs cellular work and explain why an investment of activation energy is necessary to initiate a spontaneous reaction

some unicellular organisms use this organelle to maintain the water concentrations. This allows the organism to live in a wide range of environments

Which part of the bacteriophage was injected into the bacterial cell?

Studies have noted an increase in the expression level of specific integrin proteins in tumor cells. Which type of integrins, those typically associated with hemi-desmosomes or those associated with focal adhesions, would you predict would confer an advantage in adopting the migratory behavior associated with metastasis? Briefly explain your reasoning.

In one study of certain classes of metastatic gastric (stomach) and breast cancer tumors, cells were observed to have a much higher expression of components of the ARP 2/3 complex than is typical of normal epithelial cells from these organs. Why might elevated levels of ARP 2/3 make it more likely that cells from these tumors would be better able to adopt the migratory behavior associated with metastasis? (Your answer should incorporate information on the normal role of ARP 2/3.)

Researchers have also discovered that specific t-SNARES, v-SNAREs, and Rabs are localized to the area where new membrane is being laid down. And, in a mutant in which one type of v-SNARE is unable to localize to the area, vesicles accumulate but new membranes dividing the cells do not form. In light of your knowledge about t-SNARES, v-SNAREs, and Rabs, how do explain these observations?

what organism makes its own food

why does DNA replication in bacteria occurs in only one location, whereas in eukaryotes it occurs in many locations simultaneously?

in living cells what is the function of ribosomes?

Although the stomach is normally thought of as the major organ in the digestive process, most chemical digestion actually occurs in the *
1 point
appendix
small intestine
colon
mouth
large intestine