Practice Questions

TLS Online TPP Program

#Question id: 9602

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

#Unit 9. Diversity of Life Forms

their common ancestor having been legless.
a shared adaptation to an arboreal (living in trees) lifestyle.
several instances of the legless condition arising independently of each other.
individual lizards adapting to a fossorial (living in burrows) lifestyle during their lifetimes.

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TLS Online TPP Program

#Question id: 13192

#Unit 10. Ecological Principles

In the schematic below, the left panel represents climatic zones occupied by two different biomes, X and Y, along gradients of temperature and precipitation. The right panel depicts the expected species-area relationships of these two biomes. From the figures below, which of the following are most likely to be true?

TLS Online TPP Program

#Question id: 13193

#Unit 1. Molecules and their Interaction Relevant to Biology

Data, collected from DNAs of a great many different species, led Chargaff to the following conclusions:

A. The base composition of DNA generally varies from one species to another.

B. DNA specimens isolated from different tissues of the same species have the different base composition.

C. The base composition of DNA in a given species changes with an organism’s age, nutritional state, or changing environment.

D. In all cellular DNAs, the sum of the purine residues equals the sum of the pyrimidine residues.

Which of the above statements are INCORRECT regarding Chargaff’s rule?

TLS Online TPP Program

#Question id: 13194

#Unit 1. Molecules and their Interaction Relevant to Biology