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Which one of the following statements is true?
Answer
Natural selection works on variation already present in a population
Natural selection works on non-heritable traits
Organisms evolve structures that they need
None of the statements are true
Suppose that you have just discovered a new pathogen whose genome contains 29.1 percent A, 22.3% T, 25.8% C, and 22.8% G based on the relative molar concentrations of each nitrogenous base.
The value of DNA per cell of particular species is measured in cells found at various stages of meiosis and the cell cycle, and the amounts are obtained.
Evaluate the sizes of the different digestive organs of the earthworm. Which organ is largest in the earthworm? How does its size make it well suited for its function.
Discuss and explain why is it difficult to separate large amounts of RNA and DNA using gel electrophoresis?
Why do you think you only plate a small amount of bacterial solution on the LB-Amp plate?
The habitat of one species of tropical fish is red coral reefs. The large majority of the fish in this population are red. A few individual fish carry a mutation that prevents the production of the red pigment.
Assume that for a trait that is determined through a set of two alleles, the observed frequency for homozygous dominant, homozygous recessive, and heterozygous are 0.64.
Discuss how does the altered primary structure of hemoglobin from sickle cell patients affect its tertiary structure?
Explain the four main stages of food processing in mammals and indicate where each process occurs along the tubular digestive tract.
The female I-1 and her mate, male I-2, had four children, one of whom has albinism. What is the probability that they could have had a total of four children
Positive diagnosis of AIDS is made when a patient has antibodies against the human immunodeficiency virus. Please explain why the patient has an immune deficiency if he or she is making antibodies?
What is the definition of a salvage pathway and a de novo pathway for biosynthesis? Show the salvage enzymes for both the purines and pyrimidines.
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