Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 1 - 1.1 - Concept Check - Page 11: 3


a) Evolution: Some unicellular organisms have the proteins found in chloroplasts of plants, and all plants have chloroplasts. This implies that plants evolved from these first organisms and have a common ancestry. b) Emergent Properties: A single cell in the intestines does not do much. A functioning intestinal system requires intact intestines. The cells must take the structure of the microvilli, and villi, and the rest of the intestine. c) Exchanging Matter and Energy with the Environment: A hamster consumes its hamster food. The nutrients are absorbed by the intestines and then used for growth and energy creation. Some of the food matter is excreted, and some of the energy turns into heat and is released into the environment from the hamsters body. d) Structure and Function: A horse has large, broad, flat teeth to help grind the grass and hay it eats. e) Cells: Cells in the stomach and intestines secrete enzymes that aid in digesting food. f) DNA: Skin color is controlled by the combination of genes from each of the two parents. g) Feedback Regulation: When the sugar content of the blood is high, the liver secretes insulin to make the blood sugar content lower. However, when the blood sugar is low, the liver secretes glucagon to make the blood sugar content raise.

Work Step by Step

Evolution is the process of adjustment in DNA that results in new traits and abilities. Emergent properties result from components that come together to do one large function unrelated to their individual functions. Exchanging matter and energy comes from the transfer of energy from internal to external. Structure and function is the fact that the characteristics of organisms best suit their needs. Cells have specific roles to play in the organism. DNA controls production of proteins and many traits. Feedback regulation is a control mechanism that regulates the rate a process occurs at by the results of another process.
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