Practice Questions

TLS Online TPP Program

#Question id: 13005

50 meiocytes with the genotype AaBb has 5% recombinational frequency in their gametes A and B, then how many meiocytes undergoes to the single crossing over ?

#Unit 8. Inheritance Biology

100% meiocytes undergoes to the crossing over
25% meiocytes undergoes to the crossing over
10% meiocytes undergoes the crossing over
None of the meiocytes undergoes to the crossing over

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TLS Online TPP Program

#Question id: 5686

#Unit 5. Developmental Biology

Following statements are regarding to double fertilization in angiosperms.

A. One sperm cell fuses with the egg cell to produce the zygote that will develop into the new embryonic plant.

B. The second sperm cell fuses with the usually binucleate central cell, giving rise to the

endosperm, the tissue that nourishes the developing embryo. This second event is not “true” fertilization in the sense of male and female gametes undergoing fusion.

C. The second sperm cell fuses with the usually binucleate central cell, giving rise to the

endosperm, the tissue that nourishes the developing embryo. This second event is “true” fertilization in the sense of male and female gametes undergoing fusion.

D. During fertilization in angiosperm, when the sperm cells are released, the egg undergoes a flux of Ca2+. Then, chemicals released from the egg appear to make the sperm competent for cell fusion.

Which of the following statements are true?

TLS Online TPP Program

#Question id: 15847

#Unit 4. Cell Communication and Cell Signaling

Pathogen-associated molecular patterns (or PAMPs) are common foreign structures that characterize whole groups of pathogens. It is these unique antigenic structures that the immune system frequently recognizes first. Animals, both invertebrates and vertebrates, have evolved to express several types of cell surface and soluble proteins that quickly recognize many of these PAMPs; a form of pathogen profiling. For example, encapsulated bacteria possess a polysaccharide coat with a unique chemical structure that is not found on other bacterial or human cells. White blood cells naturally express a variety of receptors, collectively referred to as pattern recognition receptors (PRRs), that specifically recognize these sugar residues, sugar residues is recognised by?

TLS Online TPP Program

#Question id: 26908

#Unit 10. Ecological Principles

Many animals obtain their amino acids from the food they eat, though plants contain only small amount of amino acids, which types of animals has the capacity to synthesizes missing amino acids?

TLS Online TPP Program

#Question id: 14857

#Unit 13. Methods in Biology