Answer:
idekoifoiwhwoifh
Explanation:
Question 2 of 25
Which best describes the scientists who contributed to our current body of
knowledge?
A. Scientists from all areas of the world
B. Scientists from the United States
C. Scientists from the Middle East
D. Scientists from Europe
Answer:
(a) because everyone is dmsrtll
Where does the energy come from to power passive and active transport?
Answer:
To move substances against a concentration or an electrochemical gradient, the cell must use energy. This energy is harvested from ATP that is generated through cellular metabolism. Active transport mechanisms, collectively called pumps or carrier proteins, work against electrochemical gradients.
Explanation:
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9. What keeps the tendons around the wrist from popping out?
Answer:
Soft tissue or subsheath keeps the tendon in place at the wrist. A sudden forced rotation or hyperextension can cause this subsheath to tear and allow the ecu to move out of its natural groove.
Explanation:
Will mark brainliest for the answer
The iron nail produces electric current that attracts the pieces of iron is the right one.
in the article, which technologies have been developed to enhance space exploration? choose all that apply
Answer:
Hahahah
Explanation:
You have recently identified a new toxin. It is produced by a gram-negative bacterium. It is composed mostly of protein, has high toxicity, and is not heat stable. You also discover that it targets liver cells. Based on these characteristics, how would you classify this toxin
Based on the characteristics above, this toxin can be categorized as EXOTOXIN. These toxins (exotoxins) are produced by different types of bacteria.
Exotoxins are a broad category of proteins produced by bacteria that enter host cells in order to alter their physiological properties.
These toxins (exotoxins) can be secreted by Gram-negative bacteria and Gram-positive bacteria.
Examples of exotoxins include botulinum toxin secreted by Clostridium botulinum bacteria, tetanospasmin toxin secreted by Clostridium tetani bacteria, etc.
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How do prions make more of themselves?
What biomolecule is a cell with a lot of ribosomes attached to its rough endoplasmic reticulum probably specialized to manufacture?
Answer:Ribosomes are the cellular structures responsible for protein synthesis. When viewed through an electron microscope, ribosomes appear either as clusters (polyribosomes) or single, tiny dots that float freely in the cytoplasm. They may be attached to the cytoplasmic side of the plasma membrane or the cytoplasmic side of the endoplasmic reticulum and the outer membrane of the nuclear envelope. Electron microscopy has shown us that ribosomes, which are large complexes of protein and RNA, consist of two subunits, aptly called large and small (Figure 1). Ribosomes receive their “orders” for protein synthesis from the nucleus where the DNA is transcribed into messenger RNA (mRNA). The mRNA travels to the ribosomes, which translate the code provided by the sequence of the nitrogenous bases in the mRNA into a specific order of amino acids in a protein. Amino acids are the building blocks of proteins.
Because proteins synthesis is an essential function of all cells, ribosomes are found in practically every cell. Ribosomes are particularly abundant in cells that synthesize large amounts of protein. For example, the pancreas is responsible for creating several digestive enzymes and the cells that produce these enzymes contain many ribosomes. Thus, we see another example of form following function.
Mitochondria
Mitochondria (singular = mitochondrion) are often called the “powerhouses” or “energy factories” of a cell because they are responsible for making adenosine triphosphate (ATP), the cell’s main energy-carrying molecule. ATP represents the short-term stored energy of the cell. Cellular respiration is the process of making ATP using the chemical energy found in glucose and other nutrients. In mitochondria, this process uses oxygen and produces carbon dioxide as a waste product. In fact, the carbon dioxide that you exhale with every breath comes from the cellular reactions that produce carbon dioxide as a byproduct.
In keeping with our theme of form following function, it is important to point out that muscle cells have a very high concentration of mitochondria that produce ATP. Your muscle cells need a lot of energy to keep your body moving. When your cells don’t get enough oxygen, they do not make a lot of ATP. Instead, the small amount of ATP they make in the absence of oxygen is accompanied by the production of lactic acid.
This transmission electron micrograph of a mitochondrion shows an oval outer membrane and an inner membrane with many folds called cristae. Inside the inner membrane is a space called the mitochondrial matrix.
Figure 2. This electron micrograph shows a mitochondrion as viewed with a transmission electron microscope. This organelle has an outer membrane and an inner membrane. The inner membrane contains folds, called cristae, which increase its surface area. The space between the two membranes is called the intermembrane space, and the space inside the inner membrane is called the mitochondrial matrix. ATP synthesis takes place on the inner membrane. (credit: modification of work by Matthew Britton; scale-bar data from Matt Russell)
Mitochondria are oval-shaped, double membrane organelles (Figure 2) that have their own DNA and ribosomes (we’ll talk about these later!). Each membrane is a phospholipid bilayer embedded with proteins. The inner layer has folds called cristae. The area surrounded by the folds is called the mitochondrial matrix. The cristae and the matrix have different roles in cellular respiration.
Peroxisomes
Peroxisomes are small, round organelles enclosed by single membranes. They carry out oxidation reactions that break down fatty acids and amino acids. They also detoxify many poisons that may enter the body. Many of these oxidation reactions release hydrogen peroxide, H2O2, which would be damaging to cells; however, when these reactions are confined to peroxisomes, enzymes safely break down the H2O2 into oxygen and water. For example, alcohol is detoxified by peroxisomes in liver cells. Glyoxysomes, which are specialized peroxisomes in plants, are responsible for converting stored fats into sugars.
Explanation:
what physical feature of dna is affected by the pairing of purines with pyrimidines?
Answer:
Its width.
Explanation:
The size of pyrimidines and purine is different because each group has a different structure (1 or two rings). Therefore, the width of DNA is "constant".
If we would pair two pyrimidines or two purines, the width of DNA would be different in both cases.
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A team of deep-sea divers and biologists is exploring the open ocean. As team members dive downward from the surface, they observe significant changes to the ocean community at a depth of about 200 meters. What is the main cause of the changes at this depth?
A. loss of brightness of the water
B. increasing salinity of the water
C. increasing temperature of the water
D. decreased oxygen concentration of water
Answer:
A
Explanation:
sunlight is the main change. sun light cannot penetrate into the deep layers of the ocean and availability of oxygen is also low there. this causes the considerable amount of organisms to live in the upper layers of the ocean and we can only observe decomposing organisms in the deeper layers!
using the chart at the beginning of the animation and your knowledge of cells, what stage of the cell cycle do most cells spend the majority of their lives?
what is the main function of the reticular activating system?
The reticular activating system's main function is regulating transition between arousal and sleep−wakeness.
what is reticular activating system?The reticular activating system (RAS) is a bundle of nerves located in the brain and it is responsible for regulating wakefulness and sleep-wake transitions.
It is also involve in filtration of noise with processing of messages or make it slower during sleep, it alters the brain's electrical activity, electrical voltage of brain waves and the speed.
The primary function of RAS is higher at brain centres when important messages are received and filter the important messages, for example The eye sends messages to the brain through the optic nerve.
If the RAS system is damaged, it can cause sleep problems, lethargy, or coma, also play a role in narcolepsy and degenerative brain disorders like Parkinson's disease and supranuclear palsy
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What type of diffusion is aided with a transport protein?
a. Osmosis
b. Permeated diffusion
c. Facilitated diffusion
d. Osmotic diffusion
Which of the following is NOT a type of transport protein?
Answer:
b permeated diffusion ...........
in a species of mice, short hair is dominant to long hair. if a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that
Answer:
the long haired trait was the dominant trait and the short haired one was the recessive trait
Explanation:
in a species of mice, short hair is dominant to long hair. if a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that the long haired trait was the dominant trait and the short haired one was the recessive trait
Define the term peristalsis and explain why is it so important
Answer:
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. ... There, the food is churned into a liquid mixture called chyme that moves into the small intestine where peristalsis continues. Stretching out a piece of intestine will make it easier to see the wave-like motion
Can someone pls help me with this 2 questions!!
Answer:
water contracts and ice sinks
Answer:
For #2, water expands when it freezes, therefore it floats!
Explanation:
Water first condenses when it freezes until it reaches about 4 degrees Celsius, where it then slowly expands by about 9%. It also floats! You can observe this yourself by placing ice into a glass full of water.
Ice floats because it is less dense than the water below.
Explain why roots are not needed in marine algae?
Because they lack vascular system !
cells that can differentiate into any cell type in an organism are referred to as ______ cells.
Cells that can differentiate into any cell type in an organism are referred to as pluripotent cells.
What is Pluripotent stem cells?
Pluripotent stem cells are cells that have the ability to self-renew by splitting and growing into the three immediate germ cell layers of the earlier embryo.
Hence into all cells of the grown-up body, but not extra-embryonic tissues such as the placenta.
Thus, pluripotent cells are Cells that can differentiate into any cell type in an organism.
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the hazard communication standard is also known as
Answer:
OSHA's Hazard Communication standard, also known as the “Right to Know Law,” is designed to ensure that vital information about chemical hazards and protective measures is passed along to workers who may come in contact with or handle these types of chemicals.
Explanation:
The Hazard Communication Standard (HCS) is also known as the "Right-to-Know" standard because the standard gives workers the right to know about hazardous chemicals.
What is the Hazard Communication Standard?The HCS was created by the Occupational Safety and Health Administration for workers so that they are informed about the hazards of the chemicals they work with and to reduce the incidence of injuries, and the standard requires chemical manufacturers, importers, and employers to communicate information about hazardous chemicals to workers through a variety of means. Employers must inform workers about the identity and hazards of any chemicals they work with, and HCS applies to all hazardous chemicals used in the workplace, including chemicals used in manufacturing and construction.
Hence, the Hazard Communication Standard (HCS) is also known as the "right-to-know" standard.
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After the enzyme releases a molecule of carbonic acid, what MOST LIKELY will occur next?
Answer:
After the enzyme releases a molecule of carbonic acid what most likely will occur next? the Enzyme will repeat its function of binding reactants and releasing carbonic acid. Carbonic anhydrase is found in the bloodstream of the human body
Which statement is false?
One chromosome can contain thousands of genes.
Chromosomes are located in the nucleus of eukaryotic cells.
Chromosomes contain the genetic code of an organism.
Chromosomes contain RNA only
Answer:
chromosomes contain RNA only, they contain DNA as well, please make me brainliest
Answer:
i got you cuz :)
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Explanation:
The flow of carbon from one carbon source to another is considered a carbon ___.
A. sink
B. flux
C.store
D. site
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Answer:
C.store of manila philippines is most beautiful in the earth
Explanation:
I think that is the true answer in this question please hearts me in brainly and give me a star ⭐
The answer is A.
The carbon flow is from the source cells such as leaf to the sink cells such as fruits.
Why are non-native, invasive species sometimes problematic for ecosystem stability?
Answer:
The bring problems with them.
Explanation:
For example if you bring a insect from over seas and it gets releast into a farm land it could kill off all the crops.
a culture medium consisting of agar, peptone, and beef heart is a:
which type of cell produces new bone tissue by secreting matrix?
Answer:
Osteoblast
Explanation:
Which sport, which spread to the region from Europe, is the most popular in North Africa?
A football (soccer)
В. baseball
С. cricket
D basketball
Answer:
A.Football
Explanation:
Correct me if im wrong.
Answer:
cricket
Explanation:
cricket is the answer
How are all living cells organized?
Answer:
TaxonomyExplanation:
The cell is the most basic unit of life. Similar cells together form tissues. Similar tissues together form organs. Organs work together in organ systems. Organ systems form complex organisms. Because living things are diverse, taxonomy was created to group organisms into categories and to understand their evolutionary relationships.
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Answer:The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
Explanation:Cells are divided into several compartments, each with a characteristic structure, biochemical composition, and function.
These compartments are called organelles. They are delimited by membranes composed of phospholipid bilayers and a number of proteins specialized for each type of organelle.
All eukaryotic cells have a nucleus surrounded by a nuclear envelope, and a plasma membrane that borders the whole cell.
Most eukaryotic cells also have endoplasmic reticulum, a Golgi apparatus, lysosomes, mitochondria, and peroxisomes.
4 difference between Filametous and colonial
The Differences are:
1. Colonial organisms appear as a sphere while Filametous organisms appear as a thread.
2. Colonial organisms is a group of individual organism with a close dependent relationship with other organisms while Filametous organisms form a filametous growth.
3. Colonial organisms form a spherical mass of cells while Filametous organisms form an array of cells with an end to end arrangement
4. Filametous organisms are either sessile or floating while Colonial organisms are generally sessile.
How do cells make energy?
Through photosynthesis.
Through the breakdown of macromolecules.
Through exercise.
Through the production of methane.
Answer:
through the break down of macromolecules
need help on #3: number the following structures in the oder in which blood passes through them - start with the valve through which blood exits from the right atrium.
The order is tricuspid valve, right ventricle, p. valve, p. artery, lungs, left atrium, mitral valve, left ventricle, aortic valve, aorta, tissues and vena cava.
What is blood passage?The blood passage refers to the passage of blood cells in the bloodstream of the circulatory system.
The tricuspid valve acts to avoid the regurgitation of the blood cells in the circulatory system.The pulmonary valve is a channel located between the right ventricle and the pulmonary artery.In conclusion, the order is tricuspid valve, right ventricle, p. valve, p. artery, lungs, left atrium, mitral valve, left ventricle, aortic valve, aorta, tissues and vena cava.
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