Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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bio
Transcribed Image Text:The host eukaryotic cell may try to travel to places in the ocean where there is a
lot of decay.
Transcribed Image Text:Many tiny single celled aquatic eukaryotic organisms feed on Cyanobacteria.
Typically they engulf the Cyanobacterium and then digest it within their cytoplasm.
In rare cases, the Cyanobacterium avoids digestion, continues to live within the
host, and continues performing photosynthesis. It may also divide, producing more
cyanobacterial cells. And in some cases, the host and cyanobacteria form a
permanent mutually beneficial relationship in which the host cell receives some of
the organic molecules produced by photosynthesis (e.g., carbohydrates). Some
scientists have wondered what the cyanobacteria get out of the relationship.
Sunlight and water are plentiful, but CO2 is less than one tenth of one percent of the
atmosphere. Perhaps carbon dioxide might be more concentrated within the host
cell than it would be if the cyanobacterium was floating free in the water, as it was
before it was swallowed up by the eukaryote cell. Why might carbon dioxide be
more concentrated inside the host cell than it would be if the Cyanobacterium was
living outside the host cell?
Carbon dioxide could be more concentrated within the cell because the host cell
might capture it from the ocean and feed it to the Cyanobacterium.
The host is a eukaryotic cell. Eukaryotic cells contain mitochondria.
Mitochondria produce carbon dioxide.
There is no reason carbon dioxide would be more concentrated inside the cell.
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