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schepotkina [342]

3 years ago

15

there are three significant differences between a plant and an animal cell. Two are found only in plant cells and one has a very

different size when it is found in the plant cell. What are the three structures

1 answer:

Ierofanga [76]3 years ago

8 0

Answer:

cell wall, vacuole and chloroplast

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All of the following have membranes around them EXCEPT one.

WARRIOR [948]

Answer:

Ribosomes

Explanation:

Rough endoplasmic reticulum, choloroplast and nucleus all are important organelles and are membrane bound except for ribosome

6 0

3 years ago

Read 2 more answers

The difference between prokaryotic and eukaryotic gene regulation

sleet_krkn [62]

Answer:

READ THIS

Explanation:

To understand how gene expression is regulated, we must first understand how a gene codes for a functional protein in a cell. The process occurs in both prokaryotic and eukaryotic cells, just in slightly different manners.

Prokaryotic organisms are single-celled organisms that lack a cell nucleus, and their DNA therefore floats freely in the cell cytoplasm. To synthesize a protein, the processes of transcription and translation occur almost simultaneously. When the resulting protein is no longer needed, transcription stops. As a result, the primary method to control what type of protein and how much of each protein is expressed in a prokaryotic cell is the regulation of DNA transcription. All of the subsequent steps occur automatically. When more protein is required, more transcription occurs. Therefore, in prokaryotic cells, the control of gene expression is mostly at the transcriptional level.

Eukaryotic cells, in contrast, have intracellular organelles that add to their complexity. In eukaryotic cells, the DNA is contained inside the cell’s nucleus and there it is transcribed into RNA. The newly synthesized RNA is then transported out of the nucleus into the cytoplasm, where ribosomes translate the RNA into protein. The processes of transcription and translation are physically separated by the nuclear membrane; transcription occurs only within the nucleus, and translation occurs only outside the nucleus in the cytoplasm. The regulation of gene expression can occur at all stages of the process (Figure 1). Regulation may occur when the DNA is uncoiled and loosened from nucleosomes to bind transcription factors (epigenetic level), when the RNA is transcribed (transcriptional level), when the RNA is processed and exported to the cytoplasm after it is transcribed (post-transcriptional level), when the RNA is translated into protein (translational level), or after the protein has been made (post-translational level).

3 0

3 years ago

Read 2 more answers

Read the following passage and construct a flow chart by matching the following events with their proper sequence. Physical exer

blsea [12.9K]

Answer:

Person starts to exercise.

Skeletal muscle oxygen demand increase

Skeletal muscle metabolism increases

.Blood delivery to the skeletal muscle increases is order to provide more oxygen

Oxygen sensors cause local blood cell vessels to dilate

.

This steps briefly describe the physiology of exercise.

At the onset of exercise, skeletal muscles cells were sustained with available oxygen from the Myoglobin. Myoglobin is oxygen binding and storage protein found in cardiac and skeletal muscles cells. it has high storing capacity for oxygen.

However as the exercise becomes intense ATPs supply drops, oxygen demand increases,cellular metabolisms demand also increase to supply glucose and ATP to the cells.

The liver mediates Gluconeogenesis. Fatty acid is broken down to glucose for cellular respiration with' ketone bodies build up..Exercise also stimulates the breakdown of muscle glycogen to glucose, Therefore, cellular respiration takes place to break down the glucose to C02, H20 and energy with rise in temperature.

However, oxygen concentration is low, therefore muscles cells undergo anaerobic respiration with lactic acid pathway. Lactic acid build up in muscles cells.The muscles cells under go oxygen debt to break down lactic acid to glucose in muscle.

Therefore to adjust the mechanism oxygen homeostatic sensors increases hyperventilation to increase oxygen intake through the lungs, and vasodilation. so that maximum volume of blood containing oxygen is transported to muscles cells; to sustain the intense activity

Explanation:

7 0

4 years ago

Anna is reading her psychology text. the activation of receptors in her retina by a source of physical energy is called _____.

Ghella [55]

sensation 2 - hope this helps!!

7 0

3 years ago

Lymphocytes are a component of which type of defense mechanism

MatroZZZ [7]

Lymphocytes or natural killer is one of the component of innate immune system where it acts as defense mechanism of the body that are always present to mobilize and fight bacteria, viruses and microbes at the site of infection.

Moreover, innate immune system also refers to non-specific recognition of certain molecular shapes on pathogens. Other components of innate immune system includes physical epithelial barriers, phagocytic leukocytes, dendritic cells, and circulating plasma proteins.

3 0

3 years ago