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Romashka [77]
3 years ago
13

Write a paragraph about cell structure

Biology
1 answer:
loris [4]3 years ago
3 0

Answer:All living things are made of the same basic building blocks, cells. A human is made of 65 trillion cells. Cells are everywhere, on you skin, in your blood, and even on your tongue. In fact, your blood is clear but red blood cells are what make your blood red. Most living things are made up of many cells but some are made of only one cell, like amebas, paramecium, fungi, protists, monerans, and bacteria.

            There are two basic types of cells, animal cells and plant cells. They have some common parts found in both and other parts that are unique to each. A cell membrane is found in both plant and animal cells. It is the structure that surrounds the cell and protects it. Plant cells have a cell wall, a rigid structure surrounding the cell membrane. Animal cells do not have a cell wall. Cytoplasm is the thick, jelly-like substance that makes up most of the cell. Vacuoles are fluid filled sacs in the cell. The vacuoles contain stored water or food that will be used by the cell. Cells also contain other "small organs" called organelles that carryout various cell functions. And then there is the control center of the cell, the nucleus, surrounded by a protective outer covering call the nuclear membrane. The nucleus contains the DNA, or chromosomes, that carries all the instructions on how a cell will function, live, and reproduce.

            Every cell needs to energy to live and reproduce. Plant and animal cells obtain energy in different ways. Animals can not make their own food. They obtain energy by taking in food, water, and oxygen and converting it to sugar. Sugar is the only food a cell can eat. Plant cells can make their own food from water and sunlight. This process is called photosynthesis. Both plant and animal cells use energy from the food they obtain to reproduce.

            All living things produce more living things. Cell reproduction is called mitosis.

Explanation:

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Air resistance is negligible.
Dahasolnce [82]

Answer:

The correct answer will be- false (only in vaccum condition is negligibe)

Explanation:

Air resistance is the force applied by the air on the moving object in the atmosphere which opposes the motion of the object. Since it opposes the motion of the object therefore, it slows down the object.

In atmospheric conditions, the air resists the acceleration and changes the speed of the object but in vacuum conditions, since it has no air, the air resistance is considered negligible.

Thus, false (only in vacuum condition is negligible) is the correct answer.

7 0
3 years ago
What happens to warm air when it cools?
Juli2301 [7.4K]

Answer:

the temp lowers

Explanation:

7 0
3 years ago
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A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to _______. A. respond to circulat
Leona [35]

A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to interact with a class II MHC-antigen complex

Importance of Class II MHC-Antigen complex

  • CD4+ T cell-dependent immunological responses need antigen presentation restricted to MHC class II.

Professional antigen-presenting cells (APCs) perform a range of functions that are essential for the generation of an effective and specific immune response.

  • Dendritic cells (DCs) investigate their surroundings and gather foreign antigens, such as those derived from bacteria or viruses, before activating CD4+ and CD8+ T cells to initiate adaptive immune responses against these antigens.
  • The thymus' DCs and epithelial cells express (and also capture) a diverse set of self-proteins that contribute to both central and peripheral tolerance.

Recognizing the processes involved in the creation (and stability) of peptide-MHC class II complexes in APCs provides crucial information about T cellular metabolism including both normal and pathological settings.

Hence, the correct answer is option D

Learn more about APC here,

brainly.com/question/13588471

# SPJ4

7 0
2 years ago
Which would be an adaptation for living in the tundra
Slav-nsk [51]

Answer:

b. hibernation to lower metabolism in the winter

Explanation:

Tundra, besides the one I live in apparently, are very, very dry because of the cold. This means that it may be helpful to hibernate for the part of the year where it is even too cold for plants and other animals.

6 0
3 years ago
If you had the job of DNA polymerase, you'd need to create a new strand to attach this one. What would the order of the letters
JulijaS [17]

T T T A A A G G G C C C T A G

6 0
4 years ago
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