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#Question id: 1970


What are antigens?

#Section 2: General Biology
  1. proteins found in the blood that cause foreign blood cells to clump

  2. proteins embedded in B cell membranes

  3. proteins that consist of two light and two heavy polypeptide chains

  4. foreign molecules that trigger the generation of antibodies

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TLS Online TPP Program

#Question id: 3285

#Section 3: Genetics, Cellular and Molecular Biology

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

TLS Online TPP Program

#Question id: 3286

#Section 3: Genetics, Cellular and Molecular Biology

 In a human population, the gene frequencies of the alleles for the ABO system are as follows:

A = 29%                         B = 7%                                    0=64%

Assuming complete random mating and Hardy-Weinberg equilibrium,

What are the blood type A frequencies in this population?

TLS Online TPP Program

#Question id: 3287

#Section 3: Genetics, Cellular and Molecular Biology

Which statement is not an assumption of the Hardy–Weinberg law?

a. The allelic frequencies (p and q) are equal.

b. The population is randomly mating.

c. The population is large.

d. Locus is di-allelic

TLS Online TPP Program

#Question id: 3288

#Section 3: Genetics, Cellular and Molecular Biology

Migration causes changes in the allelic frequency of a population by introducing alleles from other populations. The magnitude of change due to migration depends on

TLS Online TPP Program

#Question id: 3289

#Section 3: Genetics, Cellular and Molecular Biology

If, someday, an archaean cell is discovered whose SSU-rRNA sequence is more similar to that of humans than the sequence of mouse SSU-rRNA is to that of humans, the best explanation for this apparent discrepancy would be

TLS Online TPP Program

#Question id: 3290

#Section 3: Genetics, Cellular and Molecular Biology

Dog breeders maintain the purity of breeds by keeping dogs of different breeds apart when they are fertile. This kind of isolation is most similar to which of the following reproductive isolating mechanisms?