Practice Questions

TLS Online TPP Program

#Question id: 14811

The development of both humoral and cell-mediated immune responses requires interaction of T cells with antigen that has been processed and presented together with MHC molecules. Which is correct for SUSCEPTIBILITY TO ANTIGEN PROCESSING AND PRESENTATION

#Unit 4. Cell Communication and Cell Signaling

Large, insoluble macromolecules generally are more immunogenic than small, soluble ones
Small, insoluble macromolecules generally are more immunogenic than large, soluble ones
Large, soluble macromolecules generally are more immunogenic than small, insoluble ones
small, soluble macromolecules generally are more immunogenic than Large, insoluble ones

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TLS Online TPP Program

#Question id: 12238

#Unit 10. Ecological Principles

The mussel Mytilus edulis thrives in saline habitats, in both the highly salty seawater of tidal zones and the less salty estuaries. This results in two kinds of populations: one adapted to the higher salt concentrations of the tidal zone, and one adapted to the lower salt concentrations of the estuary. It has been found that the more salt-tolerant populations have high frequencies of an allele that produces an enzyme involved in maintaining osmotic equilibrium. Conversely, estuarine mussels having the same enzyme seem to be disfavoured and have a much higher death rate than mussels without the allele. Adult estuarine populations do have lower frequencies of this allele. Each spring, large numbers of larvae from the salty habitats pour into the estuaries.

The invasion of the seawater larvae would be expected to facilitate change in the genetic structure of the estuarine population by a process called

TLS Online TPP Program

#Question id: 12239

#Unit 10. Ecological Principles

The figures above show the results of an experiment in which two microbial species, A and B, were grown in three treatments. In treatment I, species A was grown alone. In treatment II, species B was grown alone. In treatment III, both species were grown together at the same starting densities as in (I) and (II). The results suggest the interaction is best described as

TLS Online TPP Program

#Question id: 12240

#Unit 10. Ecological Principles

Two plant species co-occur in a prairie. Species X always occurs near species Y. However, species often occurs in isolation from species X and produces more seeds when alone than when growing next to species X. Which of the following interactions between species X and Y could generate this pattern?

TLS Online TPP Program

#Question id: 12241

#Unit 10. Ecological Principles

The process of speciation can be prevented by

TLS Online TPP Program

#Question id: 12242

#Unit 10. Ecological Principles

Small body size often allows animals to exploit desert habitats because it