In genetics, the 'TATA box' is a conserved DNA sequence found in the promoter region of many eukaryotic genes. It is recognized and bound by: MCQ with Answer and Explanation

Question

In genetics, the 'TATA box' is a conserved DNA sequence found in the promoter region of many eukaryotic genes. It is recognized and bound by:

A. DNA ligase

B. RNA polymerase I

C. The ribosome

D. TATA-binding protein (TBP), a subunit of TFIID

Answer: Option D

Solution (By JKSSB Mock Tests)

The TATA box (consensus sequence TATAAA) is a highly conserved DNA sequence located about 25-30 base pairs upstream of the transcription start site in the promoter region of many eukaryotic genes transcribed by RNA polymerase II. It is specifically recognized and bound by the TATA-binding protein (TBP), which is a crucial subunit of the general transcription factor TFIID. The binding of TBP initiates the assembly of the pre-initiation complex, including RNA polymerase II, allowing transcription to begin.

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Question #1

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Which of the following statements about evolution is correct?

A. Darwin’s theory is based on inheritance of acquired characters.

B. Natural selection always leads to new species formation.

C. Fossils show that life forms have changed over time.

D. Homologous organs have different basic structures.

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Correct Answer: Option C

Explanation:
Fossils provide a record of past life, showing changes. Homologous organs share common anatomy, Darwin proposed natural selection, Lamarck inheritance of acquired characters, natural selection can but not always lead to speciation.

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Question #2

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The structure that prevents food from entering the nasal cavity during swallowing is the:

A. Tongue

B. Pharynx

C. Soft palate (uvula)

D. Epiglottis

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Correct Answer: Option C

Explanation:
The soft palate, including the uvula, elevates during swallowing to close off the nasopharynx, preventing food from entering the nasal passages. The epiglottis closes the larynx, the tongue pushes food.

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Question #3

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Which radioactive isotope is commonly used for dating relatively recent fossils (up to about 50,000 years old)?

A. Rubidium-87

B. Carbon-14

C. Uranium-238

D. Potassium-40

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Correct Answer: Option B

Explanation:
Carbon-14 (radiocarbon) dating is used to determine the age of organic materials up to about 50,000 to 60,000 years old. Living organisms absorb Carbon-14 from the atmosphere. When they die, absorption stops, and the Carbon-14 decays at a known rate (half-life of 5,730 years). By measuring the remaining Carbon-14, the age of the fossil can be calculated.

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