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#Question id: 2904

When the temperature of a solution of DNA is raised to near the boiling point of water, the optical density, (called absorbance) at 260 nm markedly increases, a phenomenon known as hyperchromicity. Which of the following properties gets changed due to subsequent denaturation of the DNA molecule?

#Unit 2. Cellular Organization

The solutions of native DNA exhibit high viscosity because of the relatively rigid double helical, long and rod like character of DNA molecule. Denaturation causes a marked decrease in viscosity.
Denaturation of DNA double helix can also be brought about by certain chemical agents such as urea and formamide. These chemical reagents enhance the aqueous solubility of the purine and pyrimidine groups.
Double-stranded DNA shows a strong positive rotation which highly decreases with denaturation. This change is analogous to the change in rotation observed when the proteins are denatured.
All of the above

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TLS Online TPP Program

#Question id: 31344

#Unit 12. Applied Biology

A transgenic plant for the transgenic phenotype on self pollination containing two linked copies of the transgene in heterozygous condition would segregate in (transgenic : non‐ transgenic) ratio

TLS Online TPP Program

#Question id: 10929

#Unit 7. System Physiology – Animal

Which of the following would describe the condition in a patient with aplastic anemia?

Which of the following is correct?

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#Question id: 15001

#Unit 8. Inheritance Biology

You cross true breeding lizards that are either green or albino and discover that all the offspring are striped green and white. Which is the most likely result if you cross two striped lizards?

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#Question id: 3400

#Unit 11. Evolution and Behavior

Which of the following influence effective population size?

a. Sex ratio

b. variation between individuals in reproductive success

c. Fluctuations in population size

d. Small breeding group

TLS Online TPP Program

#Question id: 10831

#Unit 10. Ecological Principles

Which of the following helps a prey species advertise to predators that it is unpalatable?