Practice Questions

TLS Online TPP Program

#Question id: 11980

A female cat in heat urinates more often and in many places. Male cats congregate near the urine deposits and fight with each other. Which of the following is a proximate cause of this behaviour of increased urination?

#Unit 10. Ecological Principles

It announces to the males that she is in heat.
Female cats that did this in the past attracted more males.
It is a result of hormonal changes associated with her reproductive cycle.
The female cat learned the behavior from observing other cats.

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TLS Online TPP Program

#Question id: 23142

#Unit 13. Methods in Biology

What is the value of numerical aperture of microscope if glycerol is used and sin α= 70^o?

TLS Online TPP Program

#Question id: 23143

#Unit 13. Methods in Biology

Which of the following parameters will give the best resolution in microscopy?

TLS Online TPP Program

#Question id: 23144

#Unit 13. Methods in Biology

An optical measurement of a protein is taken through microscopy by given that protein a high energy light and it emits a low energy light after absorption. What phenomenon is taking place?

TLS Online TPP Program

#Question id: 23145

#Unit 13. Methods in Biology

A chemical is said to be fluorescent if it absorbs light at one wavelength (excitation) and emits light (fluoresces) at a specific

TLS Online TPP Program

#Question id: 23146

#Unit 13. Methods in Biology

A phenomenon of absorption of light at a certain wavelength and then emission at longer wavelength is known as

TLS Online TPP Program

#Question id: 23147

#Unit 13. Methods in Biology

In fluorescence microscopy why the fluorescence occurs at longer wavelength when there shorter wavelength of light is applied?