Biology Answers

explain the second law of thermodynamics and why it is not violated by living organisms

Distinguish between the following pairs of terms: catabolic and anabolic pathways; kinetic and potential energy; open and closed systems; exergonic and endergonic reactions

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?

Q1: Distinguish between the following pairs of terms: catabolic and anabolic pathways; kinetic and potential energy; open and closed systems; exergonic and endergonic reactions
Q2:explain the second law of thermodynamics and explain why it is not violated by living organisms
Q3:Explain in general terms how cells obtain the energy to do cellular work
Q4:Explain how ATP performs cellular work and explain why an investment of activation energy is necessary to initiate a spontaneous reaction
Q5:Describe the mechanisms by which enzymes lower activation energy and explain how allosteric regulators may inhibit or stimulate the activity of an enzyme.

Hello there, my assignment is due in 24 hours so I was wondering if you guys can please answer within 24 hours so I can assure I submit it on time. Much appreciated, thanks

Briefly explain how the effectiveness of antimicrobial agents varies with;
Population size
Population composition
Concentration or intensity of the agent
Treatment duration
Temperature

what organism makes its own food

It is believed that protein sequence evolves and changes faster than protein structure. What could be an evolutionary explanation for this?

Name an application where you would use a method like BLAST and not a Needleman-Wunsch alignment. Name an application where you would use a slow method like Needleman and Wunsch, rather than a BLAST-like method. (2)