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1. Which of the following can be considered a contribution toa density-dependent regulation of populations?A.predation B. intraspecific competition of nutrients C. the accumulation of toxic wastesD. none of the above E. A,B, and C are correct2. The carrying capacity (K) of an environmentA. is always eventually reached in any populationB. is usually determined by energy limitationC. differs among species, but not within themD. is calculated as the product of annual per capitabirth rate (r)E. remains the same in the presence of density-dependentpopulation regulation3. To measure the population density of grasshoppersoccupying a soccer field, 100 grasshoppers are captured,marked with a red dot, and then released. The next day,another 100 grasshoppers are captured, including the recapture of20 marked grasshoppers. One would correctly estimate thepopulation to beA. 200 B. 500 C. 1,000 D. 10,000 E. 900,0004. If K represents carrying capacity, r represents theintristic growth rate, and N represents the number of organisms ina population, which of the following is the formula for logisticgrowth?A. rN(N-K)/K B. rK(r-N)/K C. rN(N-r)/rK D. rN(K-N)/K E. rK(K-N)/rN5. Lichens are usually among the first species tocolonize otherwise uninhabited rock. Due to this ability,lichens are a well knownA. primary community B. pioneerspecies C. starter community D. colony species E. settler species6. All of the following are examples of negativesymbiosis exceptA. amensalism B. competition C. commensalism D. parasitism7. Higher plants most often absorb nitrogen from soil inthe form ofA. N2 B. N3 C. ammonia D.nitrates E. amino acids
Suggest two different strategies for synthesizing a 0.5-kb gene. Discuss the advantages and disadvantages of both methods.
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Recall that DNA is made from a sequence of four nucleotides that differ in terms of which nitrogen base A,T,G,C is present in each nucleotide. Suppose you have a region of DNA which is 100 nucleotides long. How many possible nucleotide sequences are ..
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Two consecutive crosses, with the first between pure-breeding parents that differ in two phenotypes to create an F1 generation, and the second in two F1 progeny to create an F2 generation.
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There are two types of viruses, DNA viruses and RNA viruses
What problems can you see that would make it difficult to always fulfill Koch's postulates when associating a microorganism with a disease?
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