Campbell Biology in Focus
Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 25, Problem 5TYU
Summary Introduction

Introduction:

When one creature lives in the body of other organism and has mutual beneficial relation, then this interaction is known as endosymbiosis. In secondary endosymbiosis, the plastid lives in the prokaryotes and in primary endosymbiosis; the plastids are present in eukaryotes.

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One of these is NOT true about the mitochondria and plastid organelles in eukaryotes     A. mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA       B. the products of photosynthesis are metabolized by the mitochondria      C. all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids   D. CO2 produced by the mitochondrial can be used in the cell to carry out photosynthesis
Like all eukaryotes, the protozoan Giardia has undergone lateral gene transfer as shown by the presence of the gene cpn60 in its nuclear genome. What does cpn60 do in Giardia?   A. It has no known function. B. It codes for an essential transcription factor. C. It codes for a component of the electron transport chain. D. It codes for a molecular chaperone that aids in the folding of mitochondrial protein.
Horizontal gene transfer probably started soon after endosymbiosis. It has resulted in genes being moved from the mitochondrion to the nucleus.      What is a reasonable explanation for why some genes still remain in the mitochondria?    A.  The products of those genes are rapidly damaged and need to be quickly replaced.   B.  The products of those genes are not required for organelle function.   C.  The ability for lateral gene transfer ended about a billion years ago and some genes simply got “stuck” within mitochondria.   D.  The products of those genes are only needed in the mitochondria.
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY