The structure that produces ribosomes in the nucleus is the:
A. Nuclear pore
B. Nucleolus
C. Chromatin
D. Nucleoplasm
Answer: Option B
Solution (By JKExamLibrary)
The nucleolus is a dense region within the nucleus where ribosomal RNA (rRNA) is transcribed and ribosomal subunits are assembled. Chromatin is DNA-protein complex, nucleoplasm is the fluid, nuclear pores regulate transport.
Explanation:
In botanical classification, the term 'Division' corresponds to 'Phylum' in zoological classification. For example, flowering plants are in the Division Magnoliophyta (or Angiosperms), while animals are in Phyla like Chordata. The hierarchy is Kingdom → Division/Phylum → Class → Order → Family → Genus → Species. This terminological difference is a key point in taxonomy.
Consider the following statements about the circulatory system:
1. Arteries carry blood away from the heart.
2. Veins have valves to prevent backflow.
3. Capillaries are thick-walled vessels.
Which of the above is/are correct?
Explanation:
Arteries carry blood from the heart; veins have valves; capillaries are thin-walled for exchange. Statement 3 is false. So 1 and 2 are correct.
Explanation:
Solar energy is converted to chemical energy by photosynthesis, driving nearly all ecosystems. Only deep-sea vents rely on chemosynthesis.
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