TLS Online TPP Program

#Question id: 1835


The HIV nef protein affects antigen presentation by:

#Unit 4. Cell Communication and Cell Signaling
  1. Causing MHC class I retention in the Golgi

  2. Containing glycine-alanine repeats that inhibit proteasome-mediated processing of the virus

  3. Preventing peptide binding to TAP

  4. Inhibiting tapasin

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TLS Online TPP Program

#Question id: 3280

#Unit 11. Evolution and Behavior

Small populations are threatened by the loss of genetic diversity from

a. Inbreeding

b. Genetic drift

c. Limited mating

TLS Online TPP Program

#Question id: 3281

#Unit 11. Evolution and Behavior

One population X has 750 AA, 0 Aa, and 250 aa; the other Y has 500 AA, 500 Aa, and 0 aa. After one generation of random mating, the genotype frequencies X and Y respectively if the population size remains 1,000.

TLS Online TPP Program

#Question id: 3282

#Unit 11. Evolution and Behavior

Natural selection results in different forms of plants which can survive in contaminated or uncontaminated soil. Type of natural selection is

TLS Online TPP Program

#Question id: 3283

#Unit 11. Evolution and Behavior

if the forward ( p in to q) and reverse ( q in to p) mutation rates for alleles at a locus are 1×10−1 and 1×10−2 per generation, respectively and the allelic frequencies are p = 0.20 and q = 0.80. if you assuming random matting population. Which of the following observation correct?

TLS Online TPP Program

#Question id: 3284

#Unit 11. Evolution and Behavior

The fitness of three genotype are A1A1 < A1A2 = A2A2) Which of the following observation correct?

TLS Online TPP Program

#Question id: 3285

#Unit 11. Evolution and Behavior

Natural selection continually operates on each species to keep up with improvements made by competing species; each species’ environment deteriorates as its competitors evolve new adaptations. This is known as