Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 2, Problem 1Q
Summary Introduction
To analyze:
The volume of aprokaryotic cell and a eukaryotic cell. The diameter of eukaryotic hepatocytes is 20 µm (micrometer). So, thenumber of bacterial cells that would fit in a liver cell is to be estimated.
Introduction:
Prokaryotes are a heterogeneous group, which have many categories of external appearance, like cylindrical (bacillus), spheroidal (cocci), and coiled (spirilla). It has acell wall, plasma membrane, circular DNA (deoxyribonucleic acid) molecule, snd no internal membrane-enclosed organelles.
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Students have asked these similar questions
A typical human hepatocyte (liver cell), a widely studied eukaryotic cell, has a
diameter of about 20 μm. Calculate the volume of both a prokaryotic and a eukaryotic
cell. To appreciate the magnitude of the size difference between the two cell types, estimate how many bacterial cells would fit inside the liver cell. (Hint: Use the
expression V = πr
2h for the volume of a cylinder and V = (4/3)π r
3
.
True or False
Cell walls are present in the cells of archaea, bacteria, algae, fungi, and plants only.
Photosynthetic unicellular prokaryotes such as Oscillatoria exhibit a green color when viewed under a microscope because of the presence of numerous chloroplasts.
The nuclear membrane is a double-membrane structure that constitutes the outermost portion of the nucleus and is continuous with the Endoplasmic Reticulum.
Draw to scale the outline of two spherical cells, one a bacterium with a diameter of 1 μm, the other an animal cell with a diameter of 15 μm. Calculate the volume, surface area, and surface-to-volume ratio for each cell. how would the latter ratio change if you included the internal membranes of the cell in the calculation of surface area (assume internal membranes have 15 times the area of the plasma membrane)? (the volume of a sphere is given by 4πr3/3 and its surface by 4πr2, where r is its radius.) discuss the following hypothesis: “internal membranes allowed bigger cells to evolve.”
Chapter 2 Solutions
Biochemistry: The Molecular Basis of Life
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