BIOLOGY HIGH SCHOOL

Jack is seeing an onion cell under a microscope. He observes formation of a cell plate. He is observing which phase of the cell cycle?A Cytokinesis
B. Telophase
C. Interphase

Answers

Answer 1
Answer:

He observes the formation of a cell plate. He is observing the phase of the cell cycle Cytokinesis.

What is Mitosis?

Mitosis is used to produce daughter cells that are genetically identical to the parent cells which produces two daughter cells from one parent cell, during  it division,shorter cell cycles occur in early embryo cells this later result to the daughter cells been smaller than the mother cell in the embryonic cell cycles

Thus, option "A" is correct.

To learn more about  cell cycle click here:

brainly.com/question/15876101

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Answer 2
Answer: Hello there.

Jack is seeing an onion cell under a microscope. He observes formation of a cell plate. He is observing which phase of the cell cycle?

A. Cytokinesis 

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Each enzyme produced by the body isA. specific—meaning it is only able to catalyze a reaction with a certain molecule. B.incomplete—meaning it requires other parts before it is able to bind to a molecule. C. immature—meaning it cannot catalyze a reaction until many years later. D. open—meaning it is able to catalyze a reaction with any molecule.

Do prokaryotic cells have a nucleus covered by membranes?

Answers

no because they have no nucleus than how you can say that they have  a nucleus covered by membranes...right

What are the parts or process that can describe an ecosystem?a. chemical changes and flow of energy
b. chemical changes and flow of water
c. physical changes and flow of energy
d. physical changes and flow of water

Answers

Answer:

a. chemical changes and flow of energy

Explanation:

Energy flow from one organisms of one tropic level to other, matter cycling and transformation of energy are the functions that sustain the ecosystem. Transformation of solar energy into chemical energy by plants serves as energy source for all heterotrophic living beings in the system. The heterotrophic organisms digest the ingested food (chemical change) to release energy to support their life processes. The energy stored at one tropic level is carried to next tropic level via food chain and food webs and represents the interaction between living components of ecosystem.

it is      A  both chemical changes and flow of energy

How do adrenaline help in dealing with emergency situations

Answers

Adrenaline helps in emergency situation by providing energy so that the major muscles of the body can respond to the perceived threat.
In danger, the brain then sends nerve impulses to the adrenal gland in the kidneys. When the nerve signal reaches the adrenal gland, chromaffin cells, in the medulla of the adrenal gland, release epinephrine or adrenaline. It then enters the bloodstream. It is thus carried around the body to cells in various locations, where it initiates several responses.
1. Adrenaline, along with another hormone called glucagon, is responsible for the breakdown of glycogen in liver cells. Glycogen is a form of energy storage. This gives energy to the muscles
2. Adrenaline effects the skin also. Restriction of the arteries is caused by the binding of epinephrine/adrenaline to some alpha-adrenergic receptors. This cuts off blood supply to the skin. This results in the contraction of the smooth muscle cells in the skin, which cause the raising of the hairs on the surface of the skin. 
3. The lungs contain smooth muscle. Epinephrine causes smooth muscles to relax. Specifically, epinephrine binds to beta-2-adrenergic receptors on bronchiole muscle cells. This allows the bronchioles to relax, which enables intensified respiration.
4. Adrenaline binds to beta-adrenergic receptors on heart muscle cells. This causes the contraction rate of the heart to increase. This ultimately leads to increased blood supply to the tissues in the body.

Select which statements are a part of natural selection.organisms better adapted to their environment tend to survive

organisms better adapted to their environment tend to reproduce and increase in number

organisms pass on their traits to succeeding generations.

over time, favorable traits become more common in a population

Answers

Answer:   *organisms better adapted to their environment tend to survive

*organisms better adapted to their environment tend to reproduce and increase in number

*organisms pass on their traits to succeeding generations.

*over time, favorable traits become more common in a population

Explanation: all of them are correct :)

Answer:

organisms better adapted to their environment tend to reproduce and increase in number

Characteristics of animal cells include which of the following? Select all that apply. no cell wall, only plasma membrane

large hypertonic vacuole

no chlorophyll or chloroplasts

cell plate in cell division

cleavage furrow

Answers

Primarily, the properties exhibited by animal cells are:
No cell wall, only plasma membrane (cell walls are a property of plant cells)
No chlorophyll or chloroplasts (animals do not photosynthesize so do not have these organelles)
Cleavage furrow (exhibited during cell replication)

Answer:

no cell wall, only plasma membrane

cleavage furrow

Explanation:

The animal cells are different from the plant cells in many ways. The specific characteristic features of the animal cell include the absence of the cell wall, and the formation of the cleavage furrow during the cell division.

The animal cells only have plasma membrane around them. No large hypertonic vacuole is present. The chlorophyll and chloroplasts are present in the plant cells and not in the animal cells. The cell plate is formed in the plant cells during the cell division. In the animals, a cleavage furrow is formed instead of the cell plate.

If you cut your knee, pus, which is caused by _____, may form. medicinal material excreted by macrophages the death of macrophages pathogens trying to infect the area blood cells losing their hemoglobin

Answers

If you cut your knee, pus, which is caused by the death of macrophages may form. 

Answer:

Death of macrophages

Explanation:

  • Pus is formed at a site of infection and consists of a protein-rich fluid which is often yellowish white in color.
  • This is caused because the immune cells that reach the site of infection, die and build up in the area.
  • These immune cells include neutrophils and macropahges.
  • When there is an infection, these neutrophils and macrophages reach the site of injury as they are a part of the innate immune system to control the infection and then when they die and if not cleared from the site of the infection, then a build-up of pus occurs.
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