C889 Molecular and Cellular Biology
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Free C889 Molecular and Cellular Biology Questions
Which organelle is primarily responsible for regulating protein synthesis in eukaryotic cells?
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Golgi apparatus
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Mitochondria
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Endoplasmic reticulum
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Lysosome
Explanation
The endoplasmic reticulum (ER) is the organelle primarily responsible for protein synthesis. The rough ER is studded with ribosomes, which translate mRNA into polypeptide chains. These newly synthesized proteins can then be folded and modified within the ER before being transported to the Golgi apparatus for further processing and sorting. While other organelles such as mitochondria generate energy and the Golgi apparatus modifies proteins, the ER is the central site for the initial synthesis of proteins.
Which of the following most completely describes principles of the cell theory
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all living things are composed of one of more cells
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cells are the smallest unit of living organisms
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new cells come only from pre-existing cells by cell division
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cells are the smallest unit of living organisms and new cells form spontaneously
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all living organisms are composed of one or more cells, cells are the smallest units of life, and new cells come only from pre-existing cells by cell division
Explanation
The cell theory is a fundamental principle in biology that defines the characteristics of all living organisms. It states that all living things are composed of one or more cells, that cells are the basic structural and functional units of life, and that new cells arise only from pre-existing cells through cell division. This comprehensive description incorporates all three main components of the theory and accurately reflects our understanding of cellular biology. Other options are incomplete or contain incorrect information, such as spontaneous cell formation, which does not occur.
What are the two primary functions of the cytoskeleton in eukaryotic cells?
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Energy production and DNA replication
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Structural support and intracellular transport
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Cell division and protein synthesis
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Lipid storage and carbohydrate metabolism
Explanation
The cytoskeleton is a dynamic network of protein filaments, including microtubules, microfilaments (actin), and intermediate filaments, that provides structural support to the cell and maintains its shape. It also serves as a transport network, guiding the movement of organelles, vesicles, and other cellular components within the cytoplasm. By combining these functions, the cytoskeleton plays a crucial role in maintaining cellular organization and facilitating intracellular transport, which are essential for normal cell function.
Explain how chaperones contribute to protein stability and function within the cell.
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By facilitating the degradation of misfolded proteins
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By promoting the synthesis of new proteins
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By preventing misfolding and aggregation of proteins
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By enhancing the interaction between proteins and nucleic acids
Explanation
Chaperone proteins are specialized molecules that assist in the proper folding of other proteins within the cell. They prevent misfolding and aggregation by stabilizing unfolded or partially folded proteins, ensuring that proteins achieve their correct three-dimensional structure, which is essential for their function. Proper protein folding is crucial for enzymatic activity, structural integrity, and signaling within the cell. Without chaperones, misfolded proteins could accumulate, potentially leading to cellular dysfunction or disease.
If a mutation were to disrupt the production of intermediate filaments in a specific type of animal cell, what potential effects might this have on the cell's function?
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The cell would likely become more rigid and less able to change shape.
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The cell would be unable to perform cellular respiration effectively.
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The cell would lose its ability to replicate DNA.
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The cell would experience increased susceptibility to mechanical stress and deformation.
Explanation
Intermediate filaments are cytoskeletal components that provide structural support and mechanical strength to cells, helping them maintain shape and resist stress. If a mutation disrupts the production of intermediate filaments, the cell would lose some of its ability to withstand mechanical forces, making it more prone to deformation under stress. While microtubules and actin filaments also contribute to cell structure, intermediate filaments are particularly important for maintaining long-term stability, so their absence can compromise the cell’s integrity and resilience.
What is cell differentiation?
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The process by which cells can attach together to form a multicellular organism
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The process by which cells acquire different DNA sequences as they develop
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The process by which cells become specialized in different types
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The process by which cells express specific genes only when needed
Explanation
Cell differentiation is the process by which unspecialized cells, such as stem cells, develop into specialized cells with distinct structures and functions. This specialization enables the formation of tissues and organs with unique roles, such as muscle contraction, nerve signaling, or hormone secretion. Differentiation is critical for the development, growth, and maintenance of multicellular organisms, allowing cells to perform specific tasks efficiently. It does not involve changing DNA sequences or merely turning genes on or off, but rather the development of cell type-specific functions.
What is the primary outcome of both mitosis and binary fission in cellular reproduction?
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The formation of gametes
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The production of energy
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The generation of new cells from pre-existing cells
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The synthesis of proteins
Explanation
Both mitosis in eukaryotic cells and binary fission in prokaryotic cells are processes of asexual reproduction that result in the formation of new cells from pre-existing cells. In mitosis, a single eukaryotic cell divides to produce two genetically identical daughter cells, ensuring growth, tissue repair, and maintenance. Similarly, binary fission allows prokaryotic cells to reproduce by duplicating their genetic material and dividing into two identical cells. The primary purpose of both processes is the generation of new cells, rather than producing gametes, synthesizing proteins, or generating energy.
If a mutation occurs that disrupts the process of cell differentiation in a developing organism, what potential consequences might arise?
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The organism may develop normally with no effects.
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The organism may have a reduced ability to form specialized tissues, leading to developmental issues.
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The organism will only produce stem cells.
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The organism will experience accelerated aging.
Explanation
Cell differentiation is the process by which unspecialized cells develop into specialized cells with distinct structures and functions. If a mutation disrupts differentiation, the developing organism may be unable to form specialized tissues and organs properly, leading to developmental abnormalities or defects. Since differentiation is essential for the formation of functional tissues, its disruption can impair organ systems and overall development. The organism would not simply continue producing stem cells without differentiation, nor would it necessarily experience accelerated aging directly as a result of this mutation.
Explain the significance of having membrane-bound organelles in eukaryotic cells compared to prokaryotic cells.
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They allow for more efficient energy production.
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They enable compartmentalization of cellular processes.
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They increase the size of the cell.
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They are responsible for cell division.
Explanation
Membrane-bound organelles in eukaryotic cells, such as the nucleus, mitochondria, endoplasmic reticulum, and Golgi apparatus, allow the cell to compartmentalize different biochemical processes. This compartmentalization increases the efficiency and regulation of cellular activities by isolating specific reactions within specialized structures. For example, energy production occurs in mitochondria, protein synthesis in the rough ER, and genetic material is protected and transcribed in the nucleus. Prokaryotic cells lack these organelles, so their processes occur in the cytoplasm without compartmental separation, making eukaryotic cells more complex and efficient.
Biological membranes are present in all cells, and they make up the endomembrane system of eukaryotic cells. They have many functions, including acting as barriers that selectively allow the transport of small molecules and ions into and out of the cell or organelle. How are biological membranes held together?
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Peptide bonds
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Covalent bonds
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Hydrophobic interactions
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Gravity
Explanation
Biological membranes are primarily held together by hydrophobic interactions among the fatty acid tails of phospholipids. The hydrophobic interior of the lipid bilayer discourages the passage of polar molecules while allowing hydrophobic molecules to move freely. These interactions stabilize the bilayer structure and enable the dynamic nature of membranes, allowing flexibility and self-healing. Peptide bonds are involved in protein structure, covalent bonds in certain lipid modifications, and gravity has no role in holding membranes together.
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