Tuesday, July 28, 2009

Please help me?

1. Choose the BEST answer


Homeostastis is:


a) the maintenance of internal constancy in the face of a changing external environment.


b) the process of conforming to a changing environment.


c) maintained through feedback loops.


d) depends on an animal’s ability to detect external conditions.


e) all of the above except b.


f) a and c.


g) all of the above except d.





2. A phenotype is the product of:


a) a genotype, the environment has no influence.


b) an animal’s behavior.


c) a negative feedback loop.


d) an animal’s genetic makeup and its interaction with the environment.


e) the milieu interieur (internal environment).





3. True or False?


Differential survival of organisms with distinct phenotypes may result in evolutionary change in the genotype of a population over many generations.





4. The unusual properties of water have an important impact on biological processes. Which of the following is/are true?


a) Water has a lower melting point than most other solvents.


b) Water has a low heat of vaporization making sweating an effective cooling strategy for mammals.


c) Water has a higher melting point than most other solvents making it a very stable liquid.


d) Water is more dense as a solid which has important implications at the poles.


e) Water’s ability to form hydrogen bonds result in its unusual physicochemical properties.








5. Cholesterol influences membrane properties in the following ways except:


a) It is hydrophobic so does not integrate into the lipid bilayer.


b) It can reduce the membrane permeability to low-molecular weight solutes.


c) It increases membrane fluidity.


d) It strengthens the interactions between phospholipid head groups.


e) a and d





6. True or False?


Facilitated diffusion requires energy in the form of ATP to drive transport.





7. Which of these statements about the cytoskeleton is NOT true?


a) It supports networks of organelles like the Golgi apparatus within the cell.


b) It is a static structure that maintains the shape of the cell.


c) It is made up of protein polymers: microfilaments, microtubules and intermediate filaments.


d) It is involved in cellular processes like signal transduction.


e) None of the above, they’re all true.





8. True or False?


If potassium ions move out of an excitable cell, the magnitude of its membrane potential will increase (hyperpolarize); whereas if sodium channels open and Na+ moves into the cell, the magnitude of the membrane potential will decrease (depolarize).





9. Fill in the blank:


mRNA is used as a template to make proteins in a process called ___________.





10. True or False?


The electrochemical gradient that sets up an excitable cell's membrane potential can be created by simple diffusion.

Please help me?
11. True or False


Is this a take home quiz and Jummy63 is hoping someone here will do a better job on it than she will, or at least save her the effort of doing it herself?


12. True or False


Is there the chance of a snowball in Hades that I will Answer all 10 questions?
Reply:I don't know and if I did I would not tell you because you should do your own homework


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