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1) The integrity of the plasma membrane is essential for cellular survival. Could the immune system utilize this fact to destroy foreign cells that have invaded the body? How might cells of the immune system disrupt membranes of foreign cells? (Two hints: virtually all cells can secrete proteins, and some proteins form pores in membranes.)
2) Most cells are very small. What physical and metabolic constraints limit cell size? What problems would an enormous cell encounter? What adaptations might help a very large cell to survive?
3) Some species of bacteria that live at the surface of sediment on the bottom of lakes are facultative anaerobes; that is, they are capable of either aerobic or anaerobic respiration. How will their metabolism change during the summer when the deep water becomes anoxic (deoxygenated)? If the bacteria continue to grow at the same rate, will glycolysis increase, decrease, or remain the same after the lake becomes anoxic? Explain why.
What percent of all the enzyme molecules will have their Cys thiol in the active form at pH 8.6. Some mammals might run or fight when frightened. For both of these examples, illustrate the physiological mechanisms involved in the answer.
How might the initial reaction occur in this pathway. as lactate is a "dead end" product of metabolism in the sense that its sole fate is to be converted into pyruvate, what is the purpose of its formation.
Which of following statements is NOT true about the chemical bonds? Both kinds of the chemical bonds involve electrons in the outer shell. Covalent bonds share the electrons between two atoms.
assume that the Nernst potential (across a neurons plasma membrane) for Mg(2+) is a 100+ mv. Calculate the fold concentration gradient for magnesium and explain in which direction it lies across the membrane (more on the inside or outside of the c..
Discussing the significance of the neurotransmitters within the neurotransmission. Describing a relationship between the dietary fat intake and related health concerns.
Please describe how one might search for chemical structure, biologic function relationships, involving small molecular weight lipophylic compounds. Provide one example.
Which will you expect to increase significantly from M to G1. What does this tell you about how the cellular information for eye colour is pass on? Describe in detail.
What is cloning's MOST IMPORTANT impact on psychology? Cloning could cause mental illness. Cloning has no impact on psychology. Cloning might be used for cures for diseases of the nervous system. Cloning may cross the lines into creating human life.
Your doctor prescribes a drug that should be taken orally. You don't like swallowing big pills, so in the place you crush the pill into a fine powder, dissolve it in saline, and inject it into a vein in your arm. Why is this really bad idea.
The oldest rocks on Earth date from about 4.2 billion years ago. What does this propose about the interval between 4.6 billion years ago, while the Earth started to form, and 4.2 billion years ago.
The cell walls if bacteria, fungi and plant cells and an extracellular matrix of animal cells are all external to the plasma membrane. Which is the characteristic of all these extracellular structures.
The phenotypic variances were 9.4 cm2 for the inbred strain and 26.4 cm2 for the randomly pollinated population. Guess the broad sense heritability of ear length in these populations. What are the usual frequencies of the gametes from a plant with th..
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