The cyanobacterium Anabaena grows well in liquid medium that contains nitrate as the sole nitrogen source. Suppose you transfer some of these filaments to the same medium except it lacks nitrate. Describe the morphological and physiological changes you would observe.

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Answer 1

Textbook Question

Chapter 21, Problem 1CHI

The cyanobacterium Anabaena grows well in liquid medium that contains nitrate as the sole nitrogen source. Suppose you transfer some of these filaments to the same medium except it lacks nitrate. Describe the morphological and physiological changes you would observe.

Expert Solution & Answer

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

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Answer 2

Textbook Question

Chapter 21, Problem 1CHI

The cyanobacterium Anabaena grows well in liquid medium that contains nitrate as the sole nitrogen source. Suppose you transfer some of these filaments to the same medium except it lacks nitrate. Describe the morphological and physiological changes you would observe.

Expert Solution & Answer

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

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Answer 3

Textbook Question

Chapter 21, Problem 1CHI

The cyanobacterium Anabaena grows well in liquid medium that contains nitrate as the sole nitrogen source. Suppose you transfer some of these filaments to the same medium except it lacks nitrate. Describe the morphological and physiological changes you would observe.

Expert Solution & Answer

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

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Answer 4

Textbook Question

Chapter 21, Problem 1CHI

The cyanobacterium Anabaena grows well in liquid medium that contains nitrate as the sole nitrogen source. Suppose you transfer some of these filaments to the same medium except it lacks nitrate. Describe the morphological and physiological changes you would observe.

Expert Solution & Answer

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

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Answer 5

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Answer 6

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Answer 7

Expert Solution & Answer

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

Answer 8

Expert Solution & Answer

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

Answer 9

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Answer 10

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Answer 11

Summary Introduction

Anabaena lives as plankton. It is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability. They are seen in symbiotic association with some plants. These bacteria form a specialized structure known as heterocysts.

Answer 12

Explanation of Solution

Colonies of Anabaena grow as multi-cell chains. All the cells appear cylindrical otherwise barrel-shaped. The cells that are seen at the end of the chain are much longer when compared with others. When Anabaena that has been grown in the liquid medium with nitrate is transferred into the same medium lacking nitrate will show certain morphological as well as physiological changes. They are generation or formation of heterocysts that are able to fix nitrogen. Under nitrogen limiting conditions, the vegetative cells will be transformed into a heterocyst.

Answer 13

Ch. 21.3 - In what ways are members of Aquifex and Thermotoga...Ch. 21.3 - Prob. 2RIA Ch. 21.3 - Design an experiment designed to explore the role...Ch. 21.3 - Explain the relationship between genome size and...Ch. 21.4 - Why do you think NH3 is converted to the amino...Ch. 21.4 - Which of the phototrophs discussed perform...Ch. 21.4 - Prob. 1.2RIA Ch. 21.4 - Compare the capacity of green nonsulfur...Ch. 21.4 - Prob. 2.1RIA Ch. 21.4 - Prob. 2.2RIA

The cyanobacterium Anabaena grows well in liquid medium that contains nitrate as the sole nitrogen source. Suppose you transfer some of these filaments to the same medium except it lacks nitrate. Describe the morphological and physiological changes you would observe.

Solution Summary: The author explains that Anabaena is a genus that belongs to the filamentous cyanobacteria. They are well known for their nitrogen-fixing ability.

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