Multiple ChoiceWhich of the following sets of terms could be used in a description of the peripheral nervous system?
O
A. Motor neurons and sensory neurons
B. Brain and spinal cord
O C. Motor neurons and brain
O D. Sensory neurons and spinal cord

Answers

Answer 1
Answer:

Answer:

B. Brain and spinal cord

Explanation:

because we need both in order to survive and work properly.


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Describe how the body’s mechanisms maintain homeostasis?

Answers

Answer: The body maintains homeostasis by positive and negative feedback mechanism.

Explanation:

The body maintains the internal temperature and metabolism with respect to change in environment.

In case the temperature outside is very cold and the body starts shivering by the movement of skeletal muscles, this is done to maintain the temperature inside body. This is positive feedback.

When the temperature inside the body is maintained, then body stops shivering. This is negative feedback.

This is how the body maintains homeostasis.

The cell cycle of yeast cells grown in the nutrient-poor environment is approximately what percent of the cell cycle of yeast cells grown in the nutrient-rich environment.

Answers

The cell cycle of yeast cells grown in the nutrient-poor environment is approximately 168 % of the cell cycle of yeast cells grown in the nutrient-rich environment. Hence option 1 is correct.

What is cell cycle?

Cell cycle is defined as the cascade of cellular activities that lead to cell division into two daughter cells. The primary purpose of the cell cycle is to accurately divide the enormous amount of DNA found in the chromosomes into two daughter cells that are genetically identical. A cell spends the majority of its time in what is known as interphase, where it develops, duplicates its chromosomes, and gets ready to divide.

The interphase and M-phase are the two phases that make up the cell cycle. About 90% of the cycle is made up of interphase, during which the cell develops and copies its chromosomes in order to divide. Undifferentiated ESCs have a G1 and S cell cycle percentage of 15-20% and 60–70%, respectively, however as the ESCs differentiate, this ratio changes.

Thus, the cell cycle of yeast cells grown in the nutrient-poor environment is approximately 168 % of the cell cycle of yeast cells grown in the nutrient-rich environment. Hence option 1 is correct.

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Answer: 168

Explanation:

These "abiotic ingredients" are the inorganic chemicals in Earth's early atmosphere (water, methane, hydrogen, carbon dioxide). Heat, lighting and lack of oxygen caused these inorganic chemicals to react with each other and form simple organic chemicals containing both hydrogen and carbon.true or false

Answers

The answer is true.

Explain three ways of classifying Vertebrates​

Answers

Vertebrates can be subdivided into five major groups: fishes, amphibians, reptiles, birds, and mammals. Amphibians, reptiles, birds, and mammals are ranked as classes.

When compared to a cheek cell, a muscle cell contains more(A) vacuoles
(B) ribosomes
(C) mitochondria
(D) chromosomes

Answers

When compared to a cheek cell, a muscle cell contains more ribosomes and mitochondria (Option B and Option C).

  • Mitochondria are the energetic centers of the cell. In mitochondria, ATP (the energy coin of the cell) is made from ADP and phosphate.

  • A muscle cell has high energy requirements. Therefore, muscle cells need to have many mitochondria.

  • The ribosome is the cellular organelle responsible for protein synthesis.

  • A muscle cell is mainly composed of proteins in orderto carry out muscle contractions and thus produce movement.

  • Actin and myosin are the main proteins found in muscle cells since they are required to produce contractions.

In conclusion, when compared to a cheek cell, a muscle cell contains more ribosomes and mitochondria (Option B and Option C are correct).

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Final answer:

Muscle cells contain more mitochondria compared to cheek cells.

Explanation:

When compared to a cheek cell, a muscle cell generally contains more mitochondria (option C). The reason for this difference lies in the cells' respective functions. A muscle cell requires a larger amount of energy to contract and exert force, and mitochondria are the organelles that produce ATP, the cell's primary energy source. Consequently, muscle cells need a high concentration of mitochondria to meet their energy demands.

Contrastingly, cheek cells (epithelial cells) primarily serve to protect and seal off the body, and to absorb and secrete substances. They don't have as heavy energy demands as muscle cells do, and therefore generally have fewer mitochondria. Both cell types have similar numbers of vacuoles, ribosomes, and chromosomes as they are essential to general cellular processes and not specific to cell types.

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what do you think the rock in Earth’s mantle is like? Is the mantle made of hard, solid rock or soft, solid rock? Explain your ideas.

Answers

Mantle is a layer on planetary body which is made up of minerals. Mantle is solid as it is made up of heavy metals and solid rocks which makes it rigid.

What is Mantle?

A mantle is a layer inside a planetary body bounded by a core and on the above by a crust. Mantle is made up of rock or ices, and is generally the largest and most massive layer of any planetary body. Mantles are on the planetary bodies that have undergone differentiation by density.

The mantle is composed primarily of heavy metals, such as iron, nickel, and others. The state of the mantle was described as plastic. Many divide the mantle into further such as  the asthenosphere and lithosphere.

Mantle rocks are soft and able to move over the course of millions of years at great depth and pressure. The transfer of heat and material in the mantle helps to determine the landscape of the planet.

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Answer:

If the mantle is made out of soft rock, then I think it would melt due to the heat, but if it was hard, it would just burn, so I firmly believe the rock is hard.

Explanation: