Practice Questions

TLS Online TPP Program

#Question id: 12776

Which of the following is an incorrect statement about the regulation of populations?

#Unit 10. Ecological Principles

The logistic equation reflects the effect of density-dependent factors, which can ultimately stabilize popula- tions around the carrying capacity.
Density-independent factors have an increasingly greater effect as a population's density increases.
High densities in a population may cause physiological changes that inhibit reproduction.
Because of the overlapping nature of population-regulating factors, it is often difficult to precisely deter- mine their cause-and-effect relationships.

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TLS Online TPP Program

#Question id: 735

#Unit 1. Molecules and their Interaction Relevant to Biology

The a-keratin chains indicated by the diagram below have undergone one chemical step. To alter the shape of the a-keratin chains—as in hair waving—what subsequent steps are required?

TLS Online TPP Program

#Question id: 33481

#Unit 2. Cellular Organization

A. In homologous introns, the pattern of divergence involves both changes in length.

B. Divergence in introns is due to deletions and insertions and base substitutions.

C. Introns are slowly evolve while exons much more rapidly

D. When a gene is compared among different species, there are instances where its exons are homologous but its introns have diverged so much that very little homology is retained.

TLS Online TPP Program

#Question id: 1584

#Unit 4. Cell Communication and Cell Signaling

Which cell type interacts with both the humoral and cell-mediated immune pathways?

TLS Online TPP Program