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TLS Online TPP Program

#Question id: 626

A metabolic pathway proceeds according to the scheme, R -> S -> T -> U -> V -> W.  A regulatory enzyme, X, catalyzes the first reaction in the pathway.  Which of the following is most likely correct for this pathway?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Either metabolite U or V is likely to be a positive modulator, increasing the activity of X.

  2. The first product S, is probably the primary negative modulator of X, leading to feedback inhibition.

  3. The last product, W, is likely to be a negative modulator of X, leading to feedback inhibition.

  4. The last product, W, is likely to be a positive modulator, increasing the activity of X.

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TLS Online TPP Program

#Question id: 15198

#Unit 8. Inheritance Biology

In the following pedigree shows the segregation of two different recessive traits.
Assuming that both traits are 10 cM apart on the X chromosome, what is the probability that a female child will have both recessive traits?
TLS Online TPP Program

#Question id: 7696

#Unit 9. Diversity of Life Forms

The following question refers to the following phylogenetic trees. Which tree depicts the microsporidians as a sister group of the ascomycetes?
TLS Online TPP Program

#Question id: 7697

#Unit 9. Diversity of Life Forms

The following question refers to the following phylogenetic trees. Which tree depicts the closest relationship between zygomycetes and chytrids?
TLS Online TPP Program

#Question id: 7698

#Unit 9. Diversity of Life Forms

Which tree shows the greatest evolutionary distance between chytrids and ascomycetes?


TLS Online TPP Program

#Question id: 7699

#Unit 9. Diversity of Life Forms

In the phylogenetic trees, numbers represent species, and the same species are shown in both trees. Which two species are represented as sister species in Tree 2 but are not shown as sister species in Tree 1?
TLS Online TPP Program

#Question id: 7700

#Unit 9. Diversity of Life Forms

The legless condition that is observed in several groups of extant reptiles is the result of ________.