Course Code: BIO121 Course Name: Principles of Biology I Short Question:-1 (a) Cells that secrete hormones and enzymes (e.g., pancreatic cells, stomach cells) have a lot of rough endoplasmic reticulum. Explain why. (b) (i) List THREE (3) cytoskeletal elements. (ii) Describe TWO (2) functions of cytoskeletons.

Course Code: BIO121 Course Name: Principles of Biology I Short Question:-1 (a) Cells that secrete hormones and enzymes (e.g., pancreatic cells, stomach cells) have a lot of rough endoplasmic reticulum. Explain why. (b) (i) List THREE (3) cytoskeletal elements. (ii) Describe TWO (2) functions of cytoskeletons.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter4: Cell Structure

Section: Chapter Questions

Problem 23RQ: The key components of desmosomes are cadherins and. actin microfilaments intermediate filaments...

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Lecture 6-Worksheet Part 1: Below are TWO ER bound proteins. The green region is indicating the ER transfer signals. 1. Can you label the start and stop transfer signals based on the rules we just went over? 2. Draw and label these proteins. (1) (2) N N ER lumen Part 2: Sketch the orientation of this protein as it would appear in the transport vesicle and plasma membrane. membrane-enclosed organelle (e.g., ER or Golgi) vesicle plasma membrane 1₂:0. 0-9 ? CYTOSOL extracellular fluid 165
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LAB EXERCISE 3A A. Cell Membranes. In the square provided, draw a double layer of phospholipids with a large protein embedded within it. Label the parts of this phospholipid bilayer that are partially charged (polar) and uncharged (non-polar). B. Anatomy of a Cell. Draw a "typical" cell in the space below (see lecture notes or the labeled/unlabeled Images on Canvas). Sketch the following organelles within the cell and label them. Plasma (Cell) Membrane Nucleus Ribosome Rough Endoplasmic Reticulum Smooth Endoplasmic Reticulum Golgi Apparatus Mitochondria Lysosome Cytoplasm Microvilli Cilia A region of exocytosis
Task 3: Place the following events of protein synthesis in order. 1 RNA polymerase attaches to DNA MRNA exits the nucleus 3 | Stop codon is reached 4 Cap and tail added TRNA interpret the mRNA and attach amino acid 6 mRNA strand produced from DNA 7 Protein released from ribosome 8 MRNA attaches to the ribosomal subunits :::: :::: :::: :::: :::: :::: 2.
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Transport Across the Cell Membrane Worksheet 1. For each of the following examples, state whether the solution is isotonic, hypertonic or hypotonic and draw an arrow to indicate which way water will move. a) b) 100% H₂O 10% NaCl 0% NaCl 90% H₂O 83 5% salt 10% salt
IDENTIFICATION The cisternal space of ER is continuous with prenuclear space between the two membranes of the nuclear envelope and can communicate with the internals spaces of the Golgi complex and lysosome by means of _____________ that shuttle between these structures. _______________ side is oriented towards the RER (transition vesicles with newly synthesized protein arrive continuously from the ER)
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Participation Problem: Chapter 10, Problem 4: The lipid portion of a typical bilayer is about 30 Å thick. (a) Calculate the minimum number of residues in an a-helix required to span this distance. (b) Calculate the minimum number of residues in a ß-strand required to span this distance. Skip part (c) (d) The epidermal growth factor receptor (EGFR) has a single transmembrane helix. Find it in this partial sequence. ...RGPKIPSIATGMVGALLLLVVALGIGILFMRRRH... Table for reference (for parts a-b): TABLE 6.1 Parameters of some polypeptide secondary structures Structure Type B Strand (antiparallel) B Strand (parallel) a helix 310 helix Polypeptide II helix Residues per Turn 2.0 2.0 3.6 3.0 3.0 Rise (h) per Residue 3.4 Å 3.2 Å 1.5 Å 2.0 Å 4.7 Å Pitch (p) 6.8 Å 6.4 Å 5.4 Å 6.0 Å 9.4 Å