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TLS Online TPP Program

#Question id: 11543

Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a target cell would come from ________.

#Unit 7. System Physiology – Animal
  1. applying a molecule of hormone X to the extracellular fluid surrounding the cell
  2. injecting a molecule of hormone X into the cytoplasm of the cell
  3. applying a molecule of cAMP to the extracellular fluid surrounding the cell
  4. injecting a molecule of activated, cAMP-dependent protein kinase into the cytoplasm of the cell
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TLS Online TPP Program

#Question id: 19804

#Unit 12. Applied Biology

Insecticidal protein gene from the Streptomycesis taken and transformed tobacco plants to get resistance with
TLS Online TPP Program

#Question id: 15149

#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 is made 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 series with recessive mutations in both genes, what will be the phenotype in F1 progeny?
TLS Online TPP Program

#Question id: 4761

#Unit 8. Inheritance Biology

which of the following statements about a lethal allele is not correct?
TLS Online TPP Program

#Question id: 10966

#Unit 7. System Physiology – Animal

A couple requests blood typing of their 2-year-old child (father AB, Rh-negative; mother B, Rhnegative). Results of hemagglutination assays of the child’s blood are shown in the next figure. Which of the following conclusions concerning the child’s parentage is valid?
TLS Online TPP Program

#Question id: 5285

#Unit 8. Inheritance Biology

A transformation experiment is carried out using donor DNA that is A+B+C+ and a recipient that is A-B- C-. A+ transformants are selected and tested further. Of these, 64% are B+ and none are C+. Also, B+ are selected, and 8% are also C+. What is the gene order