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TLS Online TPP Program

#Question id: 1662

What is the approximate number of D segment genes in the immunoglobulin heavy chain gene locus?

#SCPH01 Biochemistry

  1. 40

  2. 23

  3. 9

  4. 6

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TLS Online TPP Program

#Question id: 15150

#SCPH01 Biochemistry

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, the F1 progeny shows will have red eye, what is the expected phenotypic ratio of red to white eyed insects in the F2.
TLS Online TPP Program

#Question id: 3708

#SCPH28 | Zoology

The incorporation of new nucleotides into a growing strand of DNA occurs during ________.
TLS Online TPP Program

#Question id: 9213

#SCPH28 | Zoology

Suppose you attend a town meeting at which some experts tell the audience that they have performed a cost-benefit analysis of a proposed transit system that would probably reduce overall air pollution and fossil fuel consumption. The analysis, however, reveals that ticket prices will not cover the cost of operating the system when fuel, wages, and equipment are taken into account. As a biologist, you know that if ecosystem services had been included in the analysis, the experts might have arrived at a different answer. Why are ecosystem services rarely included in economic analyses?
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#Question id: 4325

#SCPH28 | Zoology

Cell differentiation always involves
TLS Online TPP Program

#Question id: 35

#I Life Science/ Life Sciences Group – I-V

Arrange the following molecular components of an E. coli cell in terms of their percentage of total weight cell.