cell problem

Two intracellular molecules X and Y are both normally synthesized at a constant rate of 1000 molecules per second per cell. Molecules X is broken down slowly: each molecule of X survives on average for 100 seconds, Molecule Y is broken down 10 times faster, each molecule of Y survices on average for 10 seconds. a. calculate how many molecules X and Y the cell contains at any time b. If the rates of synthesis of both X and Y are suddenly increased tenfold to 10,000 molecules per second per cell without any change in their degradation rates-how many molecules of X and Y will there be after one second? c. Which molecule would be preferred for rapid signaling? Why? d. Which molec... click for more

signaling

Please provide an explanation... if cell surface recpetors can rapidly signal to the nucleus by activating latent gene regulatory proteins such as STAT's at the plasma membrane, why do most cell cell surface receptors use long, indirect signaling cascades to influence gene transcription in the nucleus?

RAS proteins

You are given a mutant cell that lacks the GTPase activating protein. What abnormalities would one expect to find in the way that RAS activity responds to extraxcellular signals? WHY??

Relate the features of cell components to the total functionality of the cell

As a graduate biology student you are to teach Introduction to Biology to the freshmen. In order to help them understand the complex structure, features and function of a cell, Dr. Robbins has asked you and other group members to reorganize her notes and design a unit about cells, with each group member concentrating on specific areas of the cell (include detailed information). Relate the features of the following cell components to the total functionality of the cell: • Prokaryotic cells • Eukaryotic cells • Nucleus • Nucleolus VERY IMPORTANT: It's very important to relate your cell components to the TOTAL FUNCTIONALITY OF THE CELL. YOU MUST ALSO PROVIDE REFERENCES/CITATION... click for more

Encoding a protein with a pair of conflicting signal sequences

Imagine you have engineered a set of genes, each encoding a protein with a pair of conflicting signal sequences that specify different compartments. If the genes wer expressed in a cell, predict which signal would win out for the following combinations. Explain. a. Signals for import into the nucleus and import into the ER. b. Signals for import into peroxisomes and import into the ER. c. Signals for import into the mitochondria and retention in the ER (i.e. the KDEL signal for retrieval from Golgi to ER?