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Question 1:a) What role do microtubules play in intracellular transport?b) Describe the structure of microfilaments and microfilament networks and explain how they are assembled and disassembled within a cell.c) Outline two functions that microfilament networks play in cell motility.d) What function of intermediate filaments have in eukaryotic cells?
Question 2:a) What two key factors determine the specificity of Watson-Crick base pairing in B-DNA? For each of these factors, explain why this is the case.b) What activity of E.coli DNA polymerase 1 is responsible for ensuring correct Watso-Crick pairing during DNAS synthesis?c) Outline briefly how this activity (given in your answer to part (b)) is achieved by this enzyme.
Question 3:a) What is a mitotic spindle?b) Which to classes of motor proteins interact with spindle microtubules during mitosis?c) What role do these motor proteins play in the process of mitosis?d) A drug that prevents the assembly of microtubules is applied to a culture of dividing cells for four hours. How will the culture treated with the drug differ from an untreated culture of the same cells, in terms of the numbers of cells in different stages of the cell cycle? In your answer, you should explain how the difference in appearance arises.
Question 4:a) Describe the cellular location and function of the following membrane-bound vesicles: (i) synaptic vesicle, (ii) phagosome.b) Describe the roles of two of the following proteins associated with the formation of transport vesicles: Epsin, Dynamin, GGA-proteins, GTP-binding adapter proteins.c) Give one example of a transport vesicle that moves between the ER and the Golgi apparatus, indicating its coat protein and its direction of movement.
This rise is proportional to the starting concentration of sucrose in the solution. A metabolic poison that blocks the ability of cells to regenerate ATP is found to inhibit the pH changes in the solution. Recommend a hypothesis accounting for these ..
If some cell-surface receptors, including cytokine receptors and notch, can rapidly signal to the nucleus by activating latent transcription regulators at the plasma membrane, why do most cell-surface receptors use long, indirect signalling cascades ..
Using the understanding of osmosis describe, why putting salt on a pork chop before cooking it on a grill is probable to result in a dry tough piece of meat.
Explain why there are no male offspring with the allele combinations
On the Pacific island of Guam, large herbivorous bats called "flying foxes" commonly feed on cycad seeds, a potent source of neurotoxins. The flying foxes do not visit male cones. As a result, what should be true.
Explain the causes, symptoms, effects of the bulimia and anorexia. Describe the mechanism of their reversible effects. Determine the net change of the Gibbs free energy for a DNA machine.
What is potentiation and how does it pose a threat to living organisms. what responsibility does carson believe scientists have to the public.
A chemical reaction in which polymers are synthesized from their building blocks is called.
The movement of glucose into a cell against a concentration gradient is most likely to be accomplished by which of the subsequent. movement of glucose into the cell through a glucose channel.
Why water is known as polar solvent? How is hydrogen bonding involved in cohesive attraction of water molecules? Water molecules also attract other sorts of molecules, particulary ions.Why is this.
Calcium Polycarbophil is calcium salkt of polyacrylic acid cross linked with divinyl glycol. But what is its forumla.
What are some potential research questions that would be interesting to ask of the species prepare a hypothesis and an experiment to test your hypothesis.
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