Question 1

In a DNA molecule, the adenine content is 15%. What is the content of cytosine?

Accepted Answer

According to Chargaff's rule, if the adenine content in a DNA molecule is 15%, then the thymine content will also be 15%. Therefore, the combined content of guanine and cytosine will be the remaining 70% (100% - 30% for adenine and thymine). As guanine pairs with cytosine, the content of cytosine in the DNA molecule will be 35%.

Question 2

Which of the following features of DNA makes it uniquely suited to store and transmit genetic information from generation to generation?

Accepted Answer

The unique feature of DNA that allows it to effectively store and transmit genetic information across generations is the complementary nature of its two strands. This means that the base pairs on one strand match up with their complementary bases on the other, ensuring accurate replication and inheritance of genetic material.

Question 3

Loss of limbs in snakes is explained by the evolutionary principle of

Accepted Answer

Snakes losing their limbs can be understood through the evolutionary concept of use and disuse of organs. According to Lamarck, when a body part is used more frequently, it becomes stronger, while a less used part gradually diminishes over time.

Question 4

The word 'Denisovan' is sometimes mentioned in media in reference to

Accepted Answer

The term 'Denisovan' is often discussed in the media and was first identified in 2010. Despite being not yet officially classified, there is evidence of Denisovan genetic material among Aboriginal Australians. This indicates that 'Denisovan' refers to an early human species, making option (b) the correct choice.

Question 5

Which of the following organisms perform waggle dance for others of their kin to indicate the direction and the distance to a source of their food?

Accepted Answer

Honeybees are known to perform a waggle dance to inform their fellow bees about the direction and distance of food sources.

Biology - Genetics & Evolution — UPSC Previous Year Questions

In a DNA molecule, the adenine content is 15%. What is the content of cytosine?

Year-wise Distribution

Sample Questions

Biology - Genetics & Evolution — UPSC Previous Year Questions

In a DNA molecule, the adenine content is 15%. What is the content of cytosine?

Year-wise Distribution

Sample Questions