Answers
Answer:
Animal Cell Structure
Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall. This feature was lost in the distant past by the single-celled organisms that gave rise to the kingdom Animalia. Most cells, both animal and plant, range in size between 1 and 100 micrometers and are thus visible only with the aid of a microscope.
Anatomy of the Animal Cell
The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. Specialized cells that formed nerves and muscles—tissues impossible for plants to evolve—gave these organisms mobility. The ability to move about by the use of specialized muscle tissues is a hallmark of the animal world, though a few animals, primarily sponges, do not possess differentiated tissues. Notably, protozoans locomote, but it is only via nonmuscular means, in effect, using cilia, flagella, and pseudopodia.
The animal kingdom is unique among eukaryotic organisms because most animal tissues are bound together in an extracellular matrix by a triple helix of protein known as collagen. Plant and fungal cells are bound together in tissues or aggregations by other molecules, such as pectin. The fact that no other organisms utilize collagen in this manner is one of the indications that all animals arose from a common unicellular ancestor. Bones, shells, spicules, and other hardened structures are formed when the collagen-containing extracellular matrix between animal cells becomes calcified.
Animals are a large and incredibly diverse group of organisms. Making up about three-quarters of the species on Earth, they run the gamut from corals and jellyfish to ants, whales, elephants, and, of course, humans. Being mobile has given animals, which are capable of sensing and responding to their environment, the flexibility to adopt many different modes of feeding, defense, and reproduction. Unlike plants, however, animals are unable to manufacture their own food, and therefore, are always directly or indirectly dependent on plant life.
Most animal cells are diploid, meaning that their chromosomes exist in homologous pairs. Different chromosomal ploidies are also, however, known to occasionally occur. The proliferation of animal cells occurs in a variety of ways. In instances of sexual reproduction, the cellular process of meiosis is first necessary so that haploid daughter cells, or gametes, can be produced. Two haploid cells then fuse to form a diploid zygote, which develops into a new organism as its cells divide and multiply.
The earliest fossil evidence of animals dates from the Vendian Period (650 to 544 million years ago), with coelenterate-type creatures that left traces of their soft bodies in shallow-water sediments. The first mass extinction ended that period, but during the Cambrian Period which followed, an explosion of new forms began the evolutionary radiation that produced most of the major groups, or phyla, known today. Vertebrates (animals with backbones) are not known to have occurred until the early Ordovician Period (505 to 438 million years ago).
Fluorescence Microscopy of Cells in Culture
Cells were discovered in 1665 by British scientist Robert Hooke who first observed them in his crude (by today's standards) seventeenth century optical microscope. In fact, Hooke coined the term "cell", in a biological context, when he described the microscopic structure of cork like a tiny, bare room or monk's cell. Illustrated in Figure 2 are a pair of fibroblast deer skin cells that have been labeled with fluorescent probes and photographed in the microscope to reveal their internal structure. The nuclei are stained with a red probe, while the Golgi apparatus and microfilament actin network are stained green and blue, respectively. The microscope has been a fundamental tool in the field of cell biology and is often used to observe living cells in culture. Use the links below to obtain more detailed information about the various components that are found in animal cells.
Related Questions
what makes you living
Answers
plant stems that we eat 3 examples
Answers
Answer:
Here are some of the most common vegetable stems that we eat.
Asparagus.Celery.Rhubarb.Broccoli.Cauliflower.Bamboo shoots.Brussels sprouts.Kohlrabi.which activity produces an action potential in nerve cells
Answers
Answer:
The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential.
Explanation:
what would happen if cell in human recepter is absent
Answers
Answer:
if cell in human receptor is absent then it can't detect the signal and send them to the Brain in the form of electrical signal due to it will not detect the input leading to harm our body in dangerous situation
A person lives on the Tropic of Capricorn. What is the altitude of Polaris?
O 23 1/2"
O 90°
O 66° 33"
O 15°
O 30°
O 45°
Answers
The correct answer as to what the altitude of Polaris would be for a person that lives on the Tropic of Capricon is 23° 1/2".
Polaris is a star and the altitude of any star is its height above the horizonThe Polaris is otherwise known as the North star as an indication that it is directly located overhead the north pole. Thus, it may not be visible once one moves South of the equator. The tropic of Capricon is located approximately 23° 1/2" South of the equator. In other words, the latitude of the Tropic of cancer is approximately 23° 1/2".Hence, the altitude of the Polaris at an altitude of 23° 1/2" will also be 23° 1/2", although it will most likely remain invisible.A person that lives on the Tropic of Capricon is approximately on latitude 23° 1/2". Since the altitude of a star is its height above the horizon, the altitude of Polaris from the Tropic of Capricon would, therefore, be 23° 1/2"
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What are 3 Characteristics of Life?
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How many germ surfaces do people on average touch in one minute
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Answer:
Infectious particles have been detected on both surfaces for up to 72 hours. Because virus numbers can't increase on surfaces, every hour that passes between the virus landing on a surface and you touching it decreases the chance of you getting sick.
Explanation:
hope it is helpful for you Thank youPLEASE ANSWER AS A QUESTION (UNDER THE QUESTION) I ALREADY USED ALL MY ANSWERS TODAY AND NOW BRAINLY DONT WANNA LOAD THE VIDS) So far in this activity, you have covered some of the ways that science influences outside factors and some of the ways that science is influenced by outside factors. Which of the following ways is science influenced by outside factors?
A. political campaigns.
B. the space race.
C. diet drinks.
Answers
what ia dark matter
Answers
Answer:
he quotient has a remainder of 4.
The quotient has a remainder of 14.
The quotient has no remainder.
The quotient has a remainder of 12.
Explanation:
Whet is the average speed of a boy who welis 12km in 4 hours
Answers
Answer:
3km per hour
12 ÷ 4 = 3
divide the speed by the hours and get your answer
what are the two effects of climate change on the environment
Answers
Answer:
The sea level is increasing becaise of melting Glaciers
The amount of carbon dioxide in the atmosphere has rose
Answer:
melting glaciers and warming oceans are the two effects of climate change on the environment.
Which of the following lists best illustrates the idea of increasing levels of complexity?1) Cells, tissues, organelles, organs, systems.2) Tissues, cells, organs, organelles, systems.3) Organs, organelles, systems, cells, tissues.4) Organelles, cells, tissues, organs, systems.
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There exist different levels of organization in nature, which go from the smallest things like atoms, to the most complex systems like ecosystems. In the exposed situation, the correct increasing order is Organelles, cells, tissues, organs, systems.
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According to the composing elements, we can find many different organization levels in nature.
Organelles: These are molecular subcellular structures that carry out one or more specific functions in the cell. Cell: Molecules get grouped in living cellular units that have auto replication capabilities. It is the smallest structural unit capable of functioning by itself. A cell is capable of communicating with other cells. When they receive signals from the exterior, they respond in varying ways. Their membranes delimitate them and protect them, constituting a selectively permeable barrier. Cells There are different cells with different sizes, shapes, and forms.Tissue: A tissue is the organization and association of the same type of cells. Each tissue performs different functions. These tissues can be epithelial, adipose, nervous, muscular, and etcetera. Organ: An organ is composed of different tissues that work together in a more complex function. Tissues form structures such as the heart, lung, kidney, brain, and etcetera. Each organ has its function. Systems: When different units -organs or individuals- get associated and work together, they become a system. By working together stably, these associated units maintain homeostasis.-----------------------------------------
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Which are types of bonds which hold atoms together? (Choose all that apply)
1) Iconic
2) Ionic
3) Convenient
4) Covalent
5) Nitrogen bond
6) Hydrogen bond
Answers
Answer: The bonds that hold atoms together to form molecules are called covalent bonds. They are pretty tough and not easily made or broken apart. It takes energy to make the bonds and energy is released when the bonds are broken.
Answer is (4), (2)
Explanation: did research
hope this helped if not so sorry
Oxygen is a survival need. Why is it so important?
Answers
Answer:
oxygen
Explanation:
oxygen is an essential nutrient which the body needs especially during respiration.
it help the blood cells do provide energy.
without oxygen, there is no gaseous exchange
Answer:
Because it's the only gas that can support life and without it o no human or animal can survive
The flow of genetic information in molecular biology follows the following path, A) DNA is translated into protein B) DNA is transcribed into RNA which is translated into protein C) DNA is translated into RNA which is transcribed into protein D) RNA is transcribed into protein
Answers
Answer:
The Correct answer is DNA is transcribed into RNA which is translated into protein
Explanation:
The genetic information is unidirectional, from DNA to proteins. First, DNA is transcribed into an intermediary RNA molecule is known as transcription (TC), a further messenger RNA molecule (mRNA) is translated into a corresponding sequence of amino acids (translation). This concept of information flow is known as the central dogma of molecular biology.
Learn more about the flow of genetic information in molecular biology here:
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can someone please help me
Answers
Answer:
F
Explanation:
The moon always starts off as nkt a moon. Then the first quarter, half and 3 quarters and then full moon.
Select the correct answer.
Imagine visiting a foreign nation and having to resolve a minor issue with your passport and travel plans. If someone told you that you had to travel five hours to the national capital to work with the central government, which type of government would this nation most likely have?
A.
confederal
B.
unitary
C.
federal
D.
dictatorship
Answers
the federal government
which organelle is Covered with ribosomes and surrounding the nucleus.
Answers
I hope that RNA is the organelle that is covered with ribosomes and surrounding the nucleus.
Hope it helps you...
is energy lost by catabolism or anabolism?
Answers
Explanation:
Anabolism requires energy to grow and build. Catabolism uses energy to break down. These metabolic processes work together in all living organisms to do things like produce energy and repair cells.
Catabolic reactions release energy, while anabolic reactions use up energy.
The best way to get started is to quit talking and begin doing
what is the concept that organisms can only come from other organism called
Answers
The concept that organisms can only come from other organisms is called biogenesis.
The concept of biogenesis has to do with the belief that organisms cannot just arise spontaneously from non-living objects or sources, but can only arise from another living organism through the process of reproduction.
Biogenesis is as opposed to abiogenesis. The latter is a concept that opines that organisms can arise spontaneously from non-living sources without any reproduction.
More on biogenesis can be found here: https://brainly.com/question/20893589
Please help me please find the answer
Answers
Answer:
Explanation:
atom>molecule>cell organalles>cell>tissue>organ system>organism>population>community
Identify the type of chromosomal disorder described below.
is known as trisomy 21 and impacts brain and body development.
predominantly affects males and their fertility.
predominantly affects females and can impact their growth.
Answers
Answer:
Identify the type of chromosomal disorder described below.
Down syndrome
is known as trisomy 21 and impacts brain and body development.
Klinefelter syndrome
predominantly affects males and their fertility.
Turner syndrome
predominantly affects females and can impact their growth.
Explanation:
Using the periodic table, fill in the following table with the number of electrons in each energy level of the element given.
n = 1 level n = 2 level n = 3 level n = 4 level
Element (maximum 2) (maximum 8) (maximum 18)
Carbon
Answers
Answer:
n(1)= 2 n(2) = 4 n(3) = 0 n(4)= 0
What are two ways the tragedy of the commons can be prevented? Explain.
Answers
Answer:
Garret Hardin, when he coined the phrase 'Tragedy of the Commons', proposed two ways to avoid the tragedy: (1) assign ownership of the resource system (e.g., aquifer) to the state (as state or government property); or (2) divide the resource system into parcels (e.g., as volumetric extraction entitlements) as assign
Explanation:
Explain the difference between asexual and sexual reproduction
Answers
Answer:
Asexual reproduction is when a living thing reproduces with only a single parent. Sexual reproduction involves two parents and chromosome change.
Explanation:
Ex of Asexual reproduction: Ferns, bacteria, animals, etc.
Ex of Sexual reproduction: Animals, some plants, etc.
1) Can anyone say any sources of Natural fibres
2) What are some uses of Natural fibres
Answers
Answer:
1) Natural fibers come from many sources. These sources can include plants, animals, and minerals. We are probably most familiar with plant and animal fibers from a consumer standpoint. Common natural fibers sourced from the plant kingdom include cotton, flax, hemp, bamboo, sisal, and jute
2) Benefits of a high-fiber diet
Normalizes bowel movements. Dietary fiber increases the weight and size of your stool and softens it. ...
Helps maintain bowel health. ...
Lowers cholesterol levels. ...
Helps control blood sugar levels. ...
Aids in achieving healthy weight. ...
Helps you live longer.
hey there !
here's ur answer ⤵️
Explanation:
The sources of natural fibres are plants and animals. Cotton, coir, flax, jute, rami etc.. are examples of natural fibres.
uses of natural fibres:
• These fibres are used for durable yarn,fabric,packaging and paper.
Hope it helps ✌
were do blood pump into the heart
Answers
Answer:
The right ventricle do blood pump into the heart .
Have a nice day!!Which tiny cells support the neuron with nourishment, waste elimination, and insulation for many axons?
Answers
These tiny cells are called Glial cells.
The neurons are the basic structural unit of the nervous system.
Neurons are highly specialized for transmitting electric impulses.
Each neuron is composed of the same basic parts:
a cell bodydendronsaxonin order to maintain the basic function of the neurons, there is a non-neuronal cell in the central nervous system know as the Glial cell.
Their function to the neurons include:
maintain homeostasis ( waste elimination). form myelin in the peripheral nervous system (nourishment), and provide support and protection for neurons (insulation).Learn more here:
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any two features of plants grown in hot and moist places
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Answer:
KINDLY SEE ATTACHED
Explanation:
hope it help goodluck:)
explain why air exhaled during exercise contains more carbon dioxide than exhaled at rest
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Answer:
In addition, the blood contains some carbon dioxide (a waste product) that is transferred to the air in the lungs, which is then exhaled. The result is that the exhaled air contains less oxygen and more carbon dioxide than the inhaled air.
You will exhale more CO₂ during exercise because the body consumes more glucose and oxygen during exercise than when at rest.
During exercise the body require a lot of energy than usual hence more calories( glucose ) are burnt with oxygen to provide such energy therefore releasing more CO₂ as waste product , therefore you will exhale more CO₂ while exercising.
Hence we conclude that it is because the body consumes more glucose and oxygen during exercise than at rest.
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