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#Question id: 54


About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. carbon, sodium, hydrogen, nitrogen

  2. carbon, oxygen, phosphorus, hydrogen

  3. oxygen, hydrogen, calcium, nitrogen

  4. carbon, hydrogen, nitrogen, oxygen

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#Question id: 26443

#Unit 3. Fundamental Processes

XP-V is caused by a defect in the translesion DNA polymerase

TLS Online TPP Program

#Question id: 814

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following uncommon amino acids are not found in the proteins?

TLS Online TPP Program

#Question id: 18844

#Unit 13. Methods in Biology

In the extraction of DNA from cell with to remove the high protein content from the cell , before phenol treatment which of the following treatment is done 

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#Question id: 11931

#Unit 10. Ecological Principles

Sexual dimorphism may arise from: 

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#Question id: 15154

#Unit 8. Inheritance Biology

In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in parallel with a recessive mutation in one gene and a dominant mutation in the other, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.