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MCAT Biology 1.3 Questions and Answers | Latest Update | 2024/2025 | 100% Verified R167,69   Add to cart

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MCAT Biology 1.3 Questions and Answers | Latest Update | 2024/2025 | 100% Verified

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MCAT Biology 1.3 Questions and Answers | Latest Update | 2024/2025 | 100% Verified What is the primary function of the rough endoplasmic reticulum? The rough endoplasmic reticulum is involved in the synthesis and modification of proteins, as it is studded with ribosomes that translate mR...

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  • August 21, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MCAT Biology 1.3
  • MCAT Biology 1.3
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MCAT Biology 1.3 Questions and
Answers | Latest Update | 2024/2025 |
100% Verified

What is the primary function of the rough endoplasmic reticulum?




✔✔The rough endoplasmic reticulum is involved in the synthesis and modification of proteins,

as it is studded with ribosomes that translate mRNA into polypeptides.




How do phagocytes contribute to the immune response?




✔✔Phagocytes, such as macrophages and neutrophils, engulf and digest pathogens and debris,

helping to eliminate infections and support immune defense.




What role do G-protein coupled receptors (GPCRs) play in cellular signaling?




✔✔GPCRs are cell surface receptors that, upon binding to ligands, activate intracellular

signaling pathways through the activation of G-proteins.




1

, Describe the function of the peroxisomes in a cell.




✔✔Peroxisomes are organelles that break down fatty acids and detoxify harmful substances by

producing and decomposing hydrogen peroxide.




How does the sodium-calcium exchanger (NCX) contribute to cardiac muscle function?




✔✔The sodium-calcium exchanger helps regulate intracellular calcium levels in cardiac muscle

cells by exchanging intracellular calcium for extracellular sodium, influencing heart contraction.




What is the function of the primary cilium in cell signaling?




✔✔The primary cilium acts as a sensory organelle that detects and responds to environmental

signals, playing a role in various cellular processes including signaling and development.




How does DNA methylation affect gene expression?




✔✔DNA methylation typically represses gene expression by adding methyl groups to cytosine

residues in DNA, which can prevent transcription factors from accessing the gene.

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