Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 25, Problem 21RQ
What seedless plant is a renewable source of energy?
- club moss
- horsetail
- sphagnum moss
- fern
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Glu-His-Trp-Ser-Gly-Leu-Arg-Pro-Gly
The pKa values for the peptide's side chains, terminal amino groups, and carboxyl groups are provided in the table.
Amino acid Amino pKa Carboxyl pKa Side-chain pKa
glutamate
9.60
2.34
histidine
9.17
1.82
4.25
6.00
tryptophan
9.39
2.38
serine
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glycine
9.60
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leucine
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arginine
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12.48
proline
10.96
1.99
Calculate the net charge of the molecule at pH 3.
net charge at pH 3:
Calculate the net charge of the molecule at pH 8.
net charge at pH 8:
Calculate the net charge of the molecule at pH 11.
net charge at pH 11:
Estimate the isoelectric point (pl) for this peptide.
pl:
Biology Question
This entire structure (Pinus pollen cone) using lifecycle terminology is called what?
Chapter 25 Solutions
Biology 2e
Ch. 25 - Figure 25.6 Which of the following statements...Ch. 25 - Figure 25.14 Which of the following statements...Ch. 25 - Figure 25.24 Which of the following statements...Ch. 25 - The land plants are probably descendants of which...Ch. 25 - Alternation of generations means that plants...Ch. 25 - Which of the following traits of land plants...Ch. 25 - How does a haplontic plant population maintain...Ch. 25 - What characteristic of Charales would enable them...Ch. 25 - Which one of these characteristics is present in...Ch. 25 - A scientist sequences the genome of Chara, red...
Ch. 25 - Which of the following features does not support...Ch. 25 - Which of the following structures is not found in...Ch. 25 - Stomata appear in which group of plants? Charales...Ch. 25 - The chromosome complement in a moss protonema is:...Ch. 25 - Why do mosses grow well in the Arctic tundra? They...Ch. 25 - A botanist travels to an area that has experienced...Ch. 25 - Microphylls are characteristic of which types of...Ch. 25 - A plant in the understory of a forest displays a...Ch. 25 - The following structures are found on the...Ch. 25 - The dominant organism in fern is the sperm spore...Ch. 25 - What seedless plant is a renewable source of...Ch. 25 - How do mosses contribute to returning nitrogen to...Ch. 25 - The production of megaphylls by many different...Ch. 25 - Why did land plants lose some of the accessory...Ch. 25 - What is the difference between extant and extinct?Ch. 25 - Describe at least two challenges that cactuses had...Ch. 25 - Describe a minimum of two ways that plants changed...Ch. 25 - To an alga, what is the main advantage of...Ch. 25 - In areas where it rains often, mosses grow on...Ch. 25 - What are the three classes of bryophytes?Ch. 25 - Describe two adaptations that are present in...Ch. 25 - Bryophytes form a monophyletic group that...Ch. 25 - How did the development of a vascular system...Ch. 25 - Which plant is considered the most advanced...Ch. 25 - Ferns are simultaneously involved in promoting...
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