BIOL 200 Lecture Notes - Leghemoglobin, Hemoglobin, Zinc Finger

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ceruleanprairie-dog589

6 Apr 2012

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Dna is responsible for the transmission of information through transcription and translation in order to form rna, and eventually, proteins. Proteins are an important part of the body as they perform a variety of functions depending on their shape. Structural proteins determine the shape of a cell: the provide the structural rigidity of the cell, they also guide intracellular movements of various molecules and organelles. Enzymes are catalytic proteins which catalyze (speed up) various intercellular and intracellular reactions: rna with 3d structure can also have enzymatic properties. Membrane transport proteins permit the flow of ions small organic molecules through the plasma membrane i. e. oxygen, carbon dioxide, nutrients and waste. Regulatory proteins act as sensors which can control the activities of a cell: they can do this by regulating the function of other proteins, such as enzymes. Signalling proteins such as hormones or cell-surface receptors can transmit intracellular signals to the cell exterior.

Related Questions

Proteins perform many roles in cells. Which of the following in a role you would NOT expect for proteins?

a. Proteins can carry out enzymatic reactions.

b. Proteins can bind to DNA to regulate translation.

c. Proteins can transport chemical species across the cell membrane.

d. Proteins can transport molecules like oxygen through the blood stream.

lavendermacaw662

Discuss muscle contractions as an example of the interconnectedness of cellular structures and processes. Relate to the cytoskeleton, membrane structure and transport, protein structure/function/ regulation, and cellular energy to muscle contractions.

skybat190

1) In the major biosynthetic pathway, what is the order in which mRNA moves through the various organelles?

2) Compare and contrast the structure and function of the smooth endoplasmic reticulum and the rough endoplasmic reticulum?

3) Is SAR1 COPI or COPII? What type of protein is this? What causes SAR1 to active and what protein is necessary for this to occur?
4) Dynamin binds where clathrin meets the plasma membrane. As dynamin binds, it forms a ring that is then pinched so that the vesicle can be released from the plasma membrane. What allows for this to occur?

5) What are three different mechanisms of protein translocation? Briefly describe the state of the proteins when translocated in each of these ways.

6) What is the KDEL sequence stand for and how does it function within the cell? What type of transport is it associated with?

7) In what cellular compartment would a glycoprotein be expected to have its greatest mannose content? Its greatest N-acetylglucosamine content? Its greatest sialic acid content?

8) Would you expect the properties of the cisternal side of Golgi membranes to be more similar to the extracellular or cytosolic side of the plasma membrane? Why?

9) ________ are the site of cellular digestion, in which digestion occurs with the help of 50 __________. _____ digest proteins and ____ digest lipids.

10) Name two proteins you would expect to find as integral components of the RER membrane that would be absent from the SER? Name two proteins of the SER that would not be present in the RER?

BIOL 200 Lecture Notes - Leghemoglobin, Hemoglobin, Zinc Finger

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