Exoskeletons and endoskeletons differ in that a. an exoskeleton is rigid, and an endoskeleton is flexible. b. endoskeletons are found only in vertebrates. c. exoskeletons are composed of calcium, and endoskeletons are built from chitin. d. exoskeletons are external to the soft tissues, and endoskeletons are internal.

Question

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Answer 1

Textbook Question

Chapter 46, Problem 1U

Exoskeletons and endoskeletons differ in that

a. an exoskeleton is rigid, and an endoskeleton is flexible.

b. endoskeletons are found only in vertebrates.

c. exoskeletons are composed of calcium, and endoskeletons are built from chitin.

d. exoskeletons are external to the soft tissues, and endoskeletons are internal.

Expert Solution & Answer

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

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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

Textbook Question

Chapter 46, Problem 1U

Exoskeletons and endoskeletons differ in that

a. an exoskeleton is rigid, and an endoskeleton is flexible.

b. endoskeletons are found only in vertebrates.

c. exoskeletons are composed of calcium, and endoskeletons are built from chitin.

d. exoskeletons are external to the soft tissues, and endoskeletons are internal.

Expert Solution & Answer

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

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Answer 3

Textbook Question

Chapter 46, Problem 1U

Exoskeletons and endoskeletons differ in that

a. an exoskeleton is rigid, and an endoskeleton is flexible.

b. endoskeletons are found only in vertebrates.

c. exoskeletons are composed of calcium, and endoskeletons are built from chitin.

d. exoskeletons are external to the soft tissues, and endoskeletons are internal.

Expert Solution & Answer

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 46, Problem 1U

Exoskeletons and endoskeletons differ in that

a. an exoskeleton is rigid, and an endoskeleton is flexible.

b. endoskeletons are found only in vertebrates.

c. exoskeletons are composed of calcium, and endoskeletons are built from chitin.

d. exoskeletons are external to the soft tissues, and endoskeletons are internal.

Expert Solution & Answer

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

Answer 8

Expert Solution & Answer

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

Introduction:

There are three types of skeletons that are found in various animals: hydrostatic skeletons (cnidaria), exoskeleton (arthtropods), and endoskeleton (vertebrates). The skeletal system provides the attachment sites for muscles so that they can move against it and helps in locomotion. Skeleton system also supports the body’s structure and provides protection to the organs.

Answer 12

Answer to Problem 1U

Correct answer:

Exoskeleton is present outside the body but endoskeleton is present inside the body. Therefore, option d. is correct.

Answer 13

Explanation of Solution

Reason for the correct statement:

The exoskeleton is very hard and thus provides the animals with protection. It is a layer of chitin seen in insects and crustaceans. On the other hand endoskeleton is inside the body. It can be as hard and rigid as the bones or even flexible like cartilages.

Option d. is given as “exoskeletons are external to the soft tissues, and endoskeletons are internal”.

As, “exoskeletons and endoskeletons differ in that exoskeletons are external to the soft tissues, and endoskeletons are internal”, it is the right answer.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “an exoskeleton is rigid, and an endoskeleton is flexible”.

Exoskeleton is rigid and endoskeleton is both flexible and rigid. So, it is a wrong answer.

Option b. is given as “endoskeletons are found only in vertebrates”.

Endoskeletons are found in vertebrates as well as echinoderms. So, it is a wrong answer.

Option c. is given as “exoskeletons are composed of calcium, and endoskeletons are built from chitin”.

Exoskeletons are composed of chitin and endoskeletons are composed of calcium not the other way around. So, it is a wrong answer.

Hence, options a., b. and c. are incorrect.

Answer 14

Conclusion

Exoskeletons are present outside the animal’s body and endoskeleton is inside the animal’s body.

Answer 15

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Solution Summary: The author explains the three types of skeletons that are found in various animals.

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