Pathogens are divided into five classes: bacteria, fungi , parasites , viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

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Answer 1

Question

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

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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…

Question #5: Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The genes show independent assortment. Recessive alleles at both loci are required for the facultative apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C. At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype. A facultative apomict male, capable of producing viable pollen, was crossed with a sexually reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following temperatures*: a) 15°C? b) 25°C? *for full credit, show crosses and genotypes where appropriate. Remember to position the female first (left side) in the cross. Type your answer here:

Answer 2

Question

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

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Answer 3

Question

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

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Answer 4

Question

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

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Answer 5

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

Answer 6

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

Answer 7

Chapter 23, Problem 1E

Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Answer 8

Expert Solution & Answer

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.