Question
Which one of the following statements is NOT correct?
The correct answer is
The terms heterochromatin and euchromatin refer to the active and repressed regions of the chromosome respectively
The question asks which of the given statements is NOT correct regarding chromosome structure and terminology. Let's examine each statement to determine its validity:
- Statement: During metaphase, the 2 copies of chromosomal DNA are held together at the centromere.
- Explanation: In metaphase, chromosomes are aligned at the metaphase plate, and the sister chromatids are indeed held together at the centromere. This statement is correct.
- Statement: The short arm of chromosomes is referred to as p and the long arm is referred to as q.
- Explanation: Chromosomes are divided into two arms: the short arm labeled 'p' (from petit, French for small) and the long arm labeled 'q' (because it follows 'p' in the alphabet). This statement is correct.
- Statement: The terminal structures at the end of the chromatids are referred to as telomeres.
- Explanation: Telomeres are indeed the structures located at the ends of chromatids, acting as protective caps to prevent chromosomes from degrading. This statement is correct.
- Statement: The terms heterochromatin and euchromatin refer to the active and repressed regions of the chromosome respectively.
- Explanation: This statement is incorrect because it inaccurately describes the roles of heterochromatin and euchromatin. Heterochromatin is more densely packed and is generally considered the repressed or inactive region of the chromosome, while euchromatin is less dense and is associated with active transcription of DNA to RNA. Thus, the statement should reflect that heterochromatin is repressed and euchromatin is active.
Conclusion: The incorrect statement is: "The terms heterochromatin and euchromatin refer to the active and repressed regions of the chromosome respectively."
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Important Questions from Bioenergetics ATP Hydrolysis
- Assuming that there are $5 \times 10^{13}$ cells in the human body, and that ATP is turning over at a rate of $10^9$ ATP molecules per minute in each cell, then the human body is utilizing ________ watts (rounded off to two decimal places).
[Assume that hydrolysis of ATP yields 12 kcal per mole. 1 watt = 1 joule/sec, 1 calorie = 4.18 joules, Avogadro's number = $6.023 \times 10^{23}$] - Glucose and hexanoic acid, each having six carbon atoms can undergo complete biological oxidation. In terms of net ATP generation, which of the following statements is CORRECT?
- Four groups of metabolites are given below. Choose the group in which all the compounds contain at least one bond whose ${\Delta}G'^{\circ}$ of hydrolysis is $\leq$ -7.0 kcal/mole.
- Which of the following is TRUE about Kreb's cycle?
- The movement of protons through the $F_0F_1$-ATPase during mitochondrial respiration is required for ________
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