Becker's World of the Cell (9th Edition)
Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 1, Problem 1.1PS

The Historical Strands of Cell Biology. For each of the following events, deduce whether it belongs mainly to the cytological (C), biochemical (B), or genetic (G) strand in the historical development of cell biology.

(a) Köllicker describes “sarcosomes” (now called mitochondria) in muscle cells (1857).

(b) Hoppe–Seyler isolates the protein hemoglobin in crystalline form (1864).

(c) Haeckel postulates that the nucleus is responsible for heredity (1868).

(d) Ostwald proves that enzymes are catalysts (1893).

(e) Muller discovers that X-rays induce mutations (1927).

(f) Davson and Danielli postulate a model for the structure of cell membranes (1935).

(g) Beadle and Tatum formulate the one gene–one enzyme hypothesis (1940).

(h) Claude isolates the first mitochondrial fractions from rat liver (1940).

(i) Lipmann postulates the central importance of ATP in cellular energy transactions (1940).

(j) Avery, MacLeod, and McCarty demonstrate that bacterial transformation is attributable to DNA, not protein (1944).

(k) Palade, Porter, and Sjøstrand each develop techniques for fixing and sectioning biological tissue for electron microscopy (1952–1953).

(l) Lehninger demonstrates that oxidative phosphorylation depends for its immediate energy source on the transport of electrons in the mitochondrion (1957).

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Different organelles are abundant in different cell types. Match the cell types with their abundant organelles by placing the correct letter from column B into each blank in column A. Follow the hints provided in parentheses.Column A                                                                                      Column B(1) cell in the adrenal gland that makes steroid hormones                                                                                              (a) mitochondria(2) white blood cell (phagocytic)                                           (b) smooth ER(3) liver cell (detoxifies poisons)                                            (c) peroxisomes(4) muscle cell (highly contractile)                                      (d) microfilaments(5) mucous cell (secretes protein product)                                                                                              (e) rough ER(6) epithelial cell in the outer layer of skin (withstands tension)…
This is the study of Biochemistry. This is all that was provided alongside the question. Please complete with explanations to the best of your ability
CELL STRUCTURE AND FUNCTION – EUKARYOTES, PROKARYOTES AND VIRUSES-LABORATORY REPORT SHEET  ACTIVITY 2: CELL MEMBRANES, OSMOSIS AND DIFFUSION         Initial Volume (Vi) (mL) Final Volume (Vf) (mL) Change in Volume (Vi – Vf) (mL) A 20% sucrose 20% sucrose 92.0 mL 94.0 mL -2.0 mL B 40% sucrose 20% sucrose 92.0 mL 92.0 mL 0.0 mL C 20% sucrose 40% sucrose 92.0 mL 90.0 mL 2.0 mL   Treatment Percent Change A -2% B 0% C 2%   Hypothesize which dialysis bags should gain, lose or stay the same in regards to volume. Explain. Which solution is hypotonic, hypertonic and isotonic? Explain what the change in volume of the dialysis tube indicated and describe what happened when the volume increased and when the volume decreased. Explain the relationship between solute concentration and amount of free water or water available for movement.
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