Cell Biology Answers

Human cheek cells were placed in a solution more concentrated than their cytoplasm. State the effect this would have on the appearance of the cells

A person dunks their hand in ice cold water for 5 minutes. Explain why this would mean the person would find it difficult to clench a fist for a few minutes after removing their hand from the water.

you are told that cells on a microscope slide are plant,animal, or bacerial. you look through a microscope and see cell walls and menbrane bound organelle. you conclude that the cells

Human cheek cells were placed in a solution less concentrated than their cytoplasm. Describe the effect this will have on the appearance of the cells

What happens to a cell if conditions cannot be repaired?

3. Consider the system, G + H <===> I + J at 25 °C. What is the total free energy change of this system if the total enthalpy change (heat content change) of the system is 2637 J/mol and the total entropy change is -0.78 kJ/mol.K ?

Is the system described in problem #5 endothermic or exothermic? _______________________ 

Is the system described in problem #1 endergonic or exergonic? _________________________

4. Consider the two systems shown below. These systems are coupled such that compound X carrying a phosphate group (X-P) transfers the phosphate to compound Y forming Y-P (that is Y carrying a phosphate group). (Pi represents unbound phosphate.)

Reaction 1: X-P + H2O <===> X + Pi ∆G = -43.0 kJ/mol Reaction 2: Y + Pi <===> Y-P + H2O ∆G = +29.4 kJ/mol

What is the ∆G for the combined system? ___________________________________________ 

Which reaction (system) is driving the other to proceed? _________________________________

1. Consider the system, A + B <===> C + D at 25 °C. What is the total free energy change of this system if the total enthalpy change of the system is -3145 J/mol.K and the total entropy change is +0.47 kJ/mol.K ?

Is the system described in problem #1 endothermic or exothermic?

______________________ 

Is the system described in problem #1 endergonic or exergonic? _________________________

2. If the total free energy change of the system X + Y <===> X-Y at 37 °C is +2618.2 J/mol and the total entropy change is -173.5 J/mol.K , what is the total enthalpy change?

Is the system described in problem #3 endothermic or exothermic? _________________________ 

Is the system described in problem #3 endergonic or exergonic? _________________________

What is the morphologic interest that happens to the cytoplasm during cell injury

Can you explain why a certain amount of Reactive oxygen species (ROS) could be beneficial (mitohormesis concept) despite larger quantities being harmful?

  Has any research been done investigating possible means of reducing the rate

of mtDNA mutation? please explain