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2. Signaling molecules can regulate transcription and as a result control cell differentiation during development. One signaling molecule, sonic hedgehog (shh), has been shown to regulate the dorsoven
In a continuous culture of a bacterium running at D=0.345 hr-1 glucose is the limiting substrate with a residual concentration of 0.01 g/l. The yield coefficient based on glucose is 0.5 g cell/g gluco
Q1. If water is one of our most abundant resources, why are we concerned about its availability and sustainability for the future? Explain.
It is known that vesicular traffic is crucial for the functions at all levels in an organism.
The sizes of proteins are important for their translocation into the nucleus. Thus, two types of protein translocation can be classified: for small proteins, they are translocated via free diffusion;
One group was vaccinated against a specific disease(X), and other group was not vaccinated against X, the vaccinated group developed the infection .Can you explain ,why sometimes vaccine cause the inf
CD4 helper T cell recognized a processed protein antigens displayed by professional APC ,and are activated to proliferate and differentiate into effector cells.
In your own words, explain what is meant by "post-zygotic mechanisms of reproductive isolation. and name one kind of post-zygotic isolation that is operating.
Cardiovascular diseases are the No.1 killer in the US. The high level of total blood cholesterol significantly increases the risk to these diseases. Scientists have found that cholesterols are not all
Animal cells form centrioles that make spindle fibers to separate chromatids during anaphase of mitosis. If plant cells do not have centrioles, how do they make spindle fibres?
Conduct research using the internet to identify additional characteristics such as the presence of spore, capsule, motility, oxygen requirement, cell shape of the microorganism. Prepare a two page rep
1.Why are some fruits sweet and some sour, whereas others have no specific taste?
Q1. Who should manage the natural resources: legislature, public, scientists, special interest groups, and why?
Consider the characteristics of chordates and examine them in terms of the developing human embryo to see how it fulfills the chordate criteria.
You then immerse each of these materials in a collagen solution and rinse gently in water
What can the transpiration rate tell you about a plant's rate of photosynthesis?
Explain how it is possible in biological systems to have a reaction characterized by a large delta-G and a small Ea.
What proportion of male children in a large family will eventually develop baldness in a marriage where both husband and wife are heterozygotes with genotype HnHb?
if the concentration of an endocrine ligand decreases, the target cell may insert more receptors into the cell membrane in an attempt to keep its response at a normal level, in a process known as
A rather tame ltxnsp was recently found on Easter Island by a retired neurophysiologist. He reported the following measurements of ECF and ICF concentrations (in millimoles):
You determine the transition temperatures for two membranes. The first has a transition temperature of 28°C, the second a transition temperature of 15°C. What can you conclude about the compos
If your plane leaves boston (75 W) at 7:00 am on saturday, for los angeles (120 degree W), and the flight takes 5 hours, what is the time and day when you arrive in los angeles?
How does calcium trigger the fusion of exocytotic vesicles to the plasma membrane?
1.Which of the following levels of organization is least to be adversely affected effected by large changes in pH.
Multicellular animals have some mechanism to control cell mass that we do not understand; for example, salamanders of different ploidies are the same size such that a haploid, a diploid, and a pentapl