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CA2+, IP3, and cAMP have all been described as second messengers. In what ways are their mechanisms of action similar? In what ways are they different? If you were comparing the molecular structure of kinesin and dynein, which part (heads or tails) would you expect to be most similar between them? Why.
While you measure the genotype frequencies of the population you get the following data. What will the frequency of Aa be in the next generation.
Rabbits heterozygous for Pelger trait and exhibiting that phenotype are crossed. The offspring appear in a 2:1 ratio (Pelger : normal). Explain this strange ratio.
If one assumes that Hardy-Weinberg equilibrium applies to population of colonists on this planet, about how many people will have attached ear lobes at what time the planet's population reaches 10,000.
He says that the mere presence of DNA is not sufficient to prove the point: his cells may have adopted DNA as a useful molecule quite independently of all other known life forms. What would you do to convince him that he was wrong.
Draw up a clearly labelled and appropriate 2 x 2 table to show these data. How many times more likely was a smoker to develop lung cancer than a non-smoker?
Drag the labels onto the graph to indicate which presynaptic neuron produced each change in the axon hillock's membrane potential. Assume that the same number of ligand-gated ion channels opens at each synapse.
A marine biologist has dredged up an unknown animal from the seafloor. Describe some of the characteristics she must look at to determine the phylum to which the animal have to be assigned.
Distinguish between pathological and trauma. Explain the main pathways by which energy from the sun or from specific chemical reactions enters organisms and passes from organism to organism or back into the environment.
Why is the amount of oxygen consumed so much greater than the amount require to oxidize the added oxaloacetate or malate completely.
How does the increase in estrogen level correspond to the thickness of uterine lining (endometrium)? Clarify why this makes sense based on the function of estrogen.
At start of abduction of arm, deltoid muscle is assisted by: subclavius., supraspinatus, coracobrachialis, Biceps brachii.
There they discover his mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best description of his condition.
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