The building blocks that form the DNA double helix are called Multiple Choice nucleoli. nucleotides. steroid bases. nitrogenous acids. nuclear pores. Item35
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
Item 33
The function of the nucleolus is to make
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DNA molecules.
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the subunits of ribosomes.
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the secretions that will be packaged by the Golgi apparatus.
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histones.
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the deoxyribose sugar.
Item 34
The building blocks that form the DNA double helix are called
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nucleoli.
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nucleotides. -
steroid bases.
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nitrogenous acids.
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nuclear pores.
Item 35
Which of the following is considered a required enzyme for the process of transcription?
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Aminoacyl-tRNA synthetase
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DNA polymerase
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RNA polymerase
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Amine transferase
In eukaryotic cells, the nucleolus is the biggest nuclear organelle and the principal site of ribosome subunit synthesis. It forms specialised chromosomal structures known as nucleolar organising regions (NORs), which are the locations of ribosomal DNA transcription, around arrays of ribosomal DNA genes. While the nucleolus' primary function is to regulate mitosis, cell cycle progression, stress response, and the biogenesis of multiple ribonucleoprotein complexes, the presence of proteins with no obvious relationship to ribosome subunit production suggests that the nucleolus has additional functions, such as mitosis regulation, cell cycle progression, stress response, and the biogenesis of multiple ribonucleoprotein complexes. The discovery of numerous unique components and distinct classes of proteins within the nucleolus supports the idea that the nucleolus has roles other than ribosomal subunit synthesis.
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