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TLS Online TPP Program

#Question id: 5560

In a newly fertilized egg, the vitelline layer ________.

#I Life Science/ Life Sciences Group – I-V

  1. lifts away from the egg and hardens to form a fertilization envelope

  2. secretes hormones that enhance steroidogenesis by the ovary

  3. reduces the loss of water from the egg and prevents desiccation

  4. provides most of the nutrients used by the zygote

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TLS Online TPP Program

#Question id: 18593

#SCPH06 I Botany

Some important events in the history of life on Earth are given below.
A. First dinosaurs appeared.
B. First reptiles appeared.
C. First insect fossils appeared.
D. First toothed birds appearance.
E. First wingless insect appeared.
F. Mammals like reptile arise
Match the above with the geological time periods and choose the correct combination,
TLS Online TPP Program

#Question id: 2960

#SCPH28 | Zoology

Which type of spindle microtubules are attached to chromosomes?
TLS Online TPP Program

#Question id: 19510

#SCPH05 I Biotechnology

The most electronegative element in the periodic table is———
TLS Online TPP Program

#Question id: 693

#SCPH05 I Biotechnology

In an alpha helix, the R groups on the amino acid residues:
TLS Online TPP Program

#Question id: 15235

#SCPH28 | Zoology

During the casting of polyacrylamide gel acrylamide and bis-acrylamide are joined by 
A) Free radical catalysis
B) Polymerisation reaction
C) Dehydration reaction
D) Condensation reaction