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Why do DNA and RNA polymerases can only elongate nucleotides 5' to 3'? How does this limitation affect DNA replication and RNA transcription?
You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip. Explain how much force must you exert to keep the pole motionless in a horizontal position
A sample of oxygen gas () was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.
Test the claim of the engineering firm. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
What is the peak emf of the generator when its coil rotates at a frequency of 50 Hz? Find out the frequency of the coil's rotation when the peak emf of the generator is 163 V.
In the early 1960s a number of investigators conducted a series of elegant experiments that helped to decipher the genetic code. Which of the following describes a bona fide property of the genetic code?
What are the boiling point and freezing point of a 2.47 m solution of naphthalene in benzene? (The boiling point and freezing point of benzene are 80.1°C and 5.5°C, respectively.
Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of 0.02 grams with 90 percent confidence?
What factors are considered in establishing recommended protein intakes?
An 52.0 N box of clothes is pulled 6.7 m up a 30.0° ramp by a force of 107 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, compute the change in the box's kinetic energy.
A solution is made by mixing 506 mL of water and 198 mL ethanol. What is the concentration of ethanol in units of volume/volume percent.
Assume you have made a collection of mutant fruit flies that aredefective in several aspects of DNA repair. You test each mutantfor its hypersensitivity to 3-DNA damaging agents.
You are studying the expression of a proto-oncogene in a cancer cell and comparing it to expression in a non-cancer cell. You have done experiments to detect the presence of the proto-oncogene
For each of the following mutagens, indicate what type of mutation will be induced. Also, explain how the mutagen induces the damage.
A black A/A B? B C? C is crossed with a colourless a/a b/b c/c to give a black F1. The F1 is selfed. What proportion of the F2 individuals is colourless.
In 1996, after reflecting on evidence of evolution that has been accumulating for more than a hundred years, Pope John Paul II acknowledged that the theory of evolution.
Give an example of two missense mutations in the sequence listed here ( AUG CCG AAG UCA UAA). one example that is likely to cause a dramatic change in function, and one that is likely to give a normal phenotype.
How is the segmentation in annelids different that the segmentation in tapeworms? (Hint: think about their structures that go across or through segments. Which group do you find those in?)
Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by calcium ions. However, calcium is more beneficia..
Assume you wish to increase fruit diameter in tomatoes, and you want to estimate heritability for this trait. You measured the diameter of tomatoes in two inbred lines.
An ecologist observed that sugar maples seemed to dominate the understory of a forest while the larger trees were mainly white oaks. Are the maples replacing the oaks?
Set up the suitable two-by-two table and determine a measure of association between current smoking and myocardial infarction. Determine a measure of the excess risk of myocardial infarction in cigarette smokers that is attributable to their smoking.
define Why do we use 16s rDNA for sequencing
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