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Explain why Meselson & Stahl were able to conclude that DNA replication is semiconservative. Draw pictures to represent the bands that would appear by bacterial DNA in the density-gradient tube before the switch to 14N media and after one & two generations after the switch to 14N media if replication were a) semiconservative; b) conservative; c) dispersive.
Explain the sites and actions of the cardioinhibitory and cardioacceleratory centers and also discuss the factors that affect heart rate and stroke volume.
If individual exons code for individual structural or functional domains within proteins then which of the following are likely outcomes of an insertion of an exon from gene one into another gene?
Explain: (a) why we use scientific names written in Latin (and sometimes Greek) and (b) the importance of binomial nomenclature in naming organisms. Give examples of three scientific names (in correct binomial format) of common organisms.
What type of promoters are found in the T-DNA that control oncogenes and opine synthesis genes? What is the basis for tumor formation in the Agrobacterium-plant? What causes the tumor to form? What products of the bacteria are needed to cause plan..
Few trees reach the maximum height, but some giant redwoods and sequoias do. Why do trees have an approximate limit of about 350 ft as their maximum height?
Assume if heritability of male tail length in a bird was known to be 0.5, and female birds impose a selection differential of five cm on male tail length because they are too much attracted to long tails.
Two closely related species of wolf spiders live together in northern California. However, meadow wolf spiders are only observed in meadows and forest wolf spiders are only observed in the forest. Both species are found near forest-meadow edges.
In maize the genes Pl for purple leaves (dominant over green leaves); sm for salmon silk ( recessive for yellow silk) and py for pigmy plant (recessive to normal size) are on chromosome 6 at positions 45, 55 and 65 respectively. Predict the propor..
A 78 year old women has a mean arterial pressure of 120 mmHg and a heart rate of sixty bpm. She has a stroke volume of 50 mL, cardiac output of 3000 mL/min and a right atrial pressure of 0 mmHg.
What do bryophytes and ferns require for successful reproduction that other more complex plants do not?
If we make a cross of two phenotypically WT zebrafish, and we get following results, what can we say about the genotype of those two WT looking parents from following results,
Alan White has no skin pigmentation even though he has normal melanocytes in his skin and hair.
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