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TLS Online TPP Program

#Question id: 2593

How do actin filaments appear when viewed by negative stain electron microscopy?

#Unit 2. Cellular Organization

  1. When viewed by negative stain electron microscopy, an actin filament appears as a twisted string of beads with a diameter of 7-9 nm.

  2. When viewed by negative stain electron microscopy, an actin filament appears as a straight string of beads with a diameter of 7-9 nm.

  3. When viewed by negative stain electron microscopy, an actin filament appears as a protofilamentous form with a diameter of 7-9 nm.

  4. When viewed by negative stain electron microscopy, an actin filament appears as a twisted string of beads with a diameter of 25 nm.

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TLS Online TPP Program

#Question id: 8932

#Unit 9. Diversity of Life Forms

What is the correct sequence of the following four events during an animalʹs development?
1. gastrulation
2. metamorphosis
3. fertilization
4. cleavage
TLS Online TPP Program

#Question id: 7081

#Unit 5. Developmental Biology

In xenopus, If either Nodal or Vg1 signaling is blocked, there is:
TLS Online TPP Program

#Question id: 19890

#Unit 12. Applied Biology

QCM is a kind of a piezoelectric biosensor which detects mass change. What is the standard form of QCM biosensor ?
TLS Online TPP Program

#Question id: 1104

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is true of signal molecules?
TLS Online TPP Program

#Question id: 5130

#Unit 5. Developmental Biology

Regulation by gradients of paracrine factor concentration was elegantly demonstrated by the specification of different mesodermal cell types in the frog Xenopus laevis by activin, a paracrine factor of the TGF-beta family. Which of the following observations are correct from this graph?