Answer:
(C).The R group gives the amino acid unique characteristics.
Explanation:
Amino acids can be defined as compounds, having carbon, nitrogen, oxygen, and hydrogen atoms. Ech amino acid is made up of a carboxylic group, an amino group, a side R chain, and a hydrogen atom.
The R group provides specific characteristics to the amino acids and amino acids are classified into three categories, on the basis of their side chain or R group:
-Amino acids having non-polar R group (such as alanine and valine)
-Amino acids having uncharged, polar R group (such as tyrosine and serine)
-Amino acids having charged, polar r group (such as lysine and glutamate).
Thus, the correct answer is option (C).
A scientist is comparing the outer layer of an onion cell to the outer layer of a human skin cell. What is unique about the outer layer of the onion cell compared to the skin cell?
It contains proteins.
It contains cellulose.
It contains carbohydrates.
It is selectively permeable.
The outer layer of the onion cell, which is a plant cell, contains cellulose, however, the human skin cell (which is an animal cell) does not contain cellulose in it. The plant cells have a rigid cell wall present around the cell membrane, which protects the cell from the outer environment and keeps it rigid. This cell wall of the plant cells is composed of the cellulose. The animal cells have no cell wall present around them, and thus, contain no cellulose.
Hence, the correct answer is 'it contains cellulose'.
The unique characteristic of the outer layer of the onion cell compared to the skin cell is that it contains cellulose.
What is cellulose?Cellulose is a complex carbohydrate that forms the cell wall of plant cells, providing rigidity and structural support. In contrast, the outer layer of a human skin cell does not contain cellulose but is composed of keratin, a protein that gives skin its strength and durability.
While proteins, carbohydrates, and selective permeability are all important components of cellular membranes, the presence of cellulose specifically distinguishes the outer layer of the onion cell. Cellulose is a major component of plant cell walls and is responsible for their characteristic shape and structure. It provides a protective barrier and contributes to the overall integrity of the cell.
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"describe how prolonged immobilization results in muscle injury"
Prolonged immobilization causes muscle atrophy, which leads to muscle weakening and reduced function due to the muscles not receiving regular stimulation. Improper immobilization of fractures can cause misalignment during healing, further injuring muscles. Exercise and rest are crucial for preventing and recovering from muscle injuries, while improper technique can lead to overuse injuries.
Prolonged immobilization can have detrimental effects on muscle tissue, leading to muscle atrophy and injury. When muscles are not subjected to regular activity or strain, such as in cases where individuals experience extended bed rest, spaceflight, or being immobilized due to injury, they begin to weaken and decrease in size.
The muscle fibers become smaller, resulting in overall muscle weakening, which, in turn, diminishes strength and function. This process occurs because the muscles are deprived of the regular stimulation needed for maintaining muscle mass and protein content.
Additionally, immobilization can lead to the damage of syndesmotic joints and the associated muscles. If a fracture is not properly immobilized, the muscles that are still trying to contract can cause misalignment during the healing process, exacerbating the injury and leading to prolonged recovery times.
Furthermore, when muscles have undergone significant damage, their capacity to produce power is compromised due to the loss in muscle fiber quantity and quality. Regular exercise and stretching are essential to prevent muscle injury and to encourage recovery and strength-building following an injury.
However, it is critical to balance exercise with adequate rest, as overuse injuries can occur from activities such as resistance training without proper rest and recovery time. These injuries may include damage to muscle fibers, tendons, or bones, and they highlight the need for careful alignment and technique during exercises to prevent further harm to the muscles.
Compare two ways that the binding of a signal molecule to a receptor protein causes a change in the activity of the receiving cell
A ball-and-socket joint is capable of a complex movement that involves flexion, extension, adduction, and abduction performed in rapid succession called __________.
All animals are eukaryotes. In a sentence or two, explain what this means.
Answer:
All animals are eukaryotes means they all have a well-defined nucleus and other organelles.
Explanation:
Eukaryotic organisms mean true nucleus. The organism has a nucleus are eukaryotes. certain exclusive characteristics:
They contain a nucleus. They have other organelles such as mitochondria, endoplasmic reticulum, Golgi body, etc.All animals have a well-defined nucleus and other organelles.
Hence from the above discussion, we can say that All animals are eukaryotes means they all have a well-defined nucleus and other organelles.
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selective breeding is the only method to change life forms characteristics true or false
The assertion that selective breeding is the only way to alter the characteristics of life forms is false because other methods like genetic engineering and natural selection also play a role. Selective breeding, or artificial selection, has been used for millennia but is limited by the genetic variability of complex organisms and can result in unintended trait changes.
The statement that selective breeding is the only method to change life forms' characteristics is false. There are other processes such as genetic engineering and natural selection that also result in changes to an organism's traits. Selective breeding, also known as artificial selection, is a method where humans breed plants or animals with desirable traits to produce offspring that express those traits more strongly. This process has been used for thousands of years, notably in the domestication of various plant and animal species.
However, selective breeding is not without its limitations, especially concerning complex organisms. Such organisms often experience unintentional changes in other characteristics when selectively bred for a particular trait, which could be detrimental. Furthermore, in complex organisms like humans, a very small fraction of genetic variation between individuals limits the range of characteristics that can be selected for at any given time. On the other hand, genetic engineering allows for direct manipulation of DNA to achieve desired traits, and natural selection involves the differential survival and reproduction of individuals due to differences in phenotype.
Therefore, while selective breeding can induce change in an organism's traits, it is by no means the sole method available for such modification.
_____ is considered a pioneer in the area of suicide study.
In humans, oxygen is effectively delivered to the tissues because of the presence of several allosteric modulators. name three of these modulators and explain how their presence allows oxygen to be delivered to the tissues.
Where else is amylase secreted in the digestive system?
The tharsis bulge on mars is most likely the result of
The laboratory report of a client reveals that the platelet count is 60,000/µl (60 x 10 9/l). which integumentary changes can be anticipated in this client? cyanosis petechiae varicosity ecchymosis hematoma
Why is taking vitamin c ineffective at enhancing iron absorption from standard iron supplements?
When two average-height parents give birth to a child exhibiting achondroplasia, it is most likely due to a new mutation. this is because __________?
How does a eukaryotic plant cell store and remove waste materials?
The cell theory was constructed by _____. Robert Hook Schleiden and Schwann Carolus Linnaeus
Answer:
Schleiden and Schwann
Explanation:
The cell theory is the now universally believed theory that all living being are formed by cells, and the first cell theory was proposed by Theodor Shchwann and Mathias Jakob Schleiden, back in 1830, the first cell was ever observed in a microscope by Robert Hook in the 16th century but it wouldn´t be untill 2 centuries later that the cell theory started to take form.
20 POINTS FOR FIRST PART AND 20 POINTS FOR THE SECOND PART
Identify the first step of the Calvin cycle and DESCRIBE what happens?
Final answer:
The initial step of the Calvin cycle is carbon fixation, where CO₂ is attached to RuBP to form a six-carbon compound that splits into two molecules of 3-PGA, catalyzed by the enzyme rubisco, setting the stage for the subsequent sugar production using ATP and NADPH.
Explanation:
The first step of the Calvin cycle is known as carbon fixation. During this phase, CO₂ from the atmosphere is attached to a five-carbon molecule called ribulose-1,5-bisphosphate (RuBP). This reaction is catalyzed by the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase, commonly known as rubisco. The result is a six-carbon compound that immediately splits into two three-carbon molecules of 3-phosphoglycerate (3-PGA). This is how CO₂ is 'fixed' from its inorganic form into an organic molecule, which can then be further transformed through the Calvin cycle with the help of energy carriers ATP and NADPH generated during the light reactions of photosynthesis. These energy carriers provide the necessary energy to eventually transform the 3-PGA molecules into glucose.
How we to prevent disease from spreading when travel?
The examination of urine to determine the presence of abnormal elements is known as .
a collection of specialized cells and cell products that perform a specific function
A collection of specialized cells and cell products that perform a specific function is called "tissue".
How many types of muscle tissues are found?There are three different forms of muscle tissue: skeletal muscle tissue. tissue of smooth muscles. Heart muscle tissue type of tissue is in the muscular system.
Animals with muscular tissue have a specific tissue that uses contraction to apply forces to various bodily components. Muscle fibers are long, slender cells that make up this structure. It manages an organism's mobility skeletal muscle.
Sarcoplasm is the name for the cytoplasm found inside muscle fibers. The sarcoplasmic reticulum, a network of membranes, is present there. The term "sarcolemma" refers to the membrane that encloses the muscle fibers.
A type of connective tissue that is not a connective tissue proper is Cartilage. A connective tissue is a type of tissue in the body of mammals that is used to connect or join all the other tissues in the body system. Some types of connective tissues include the dense irregular connective tissue and loose connective tissue.
Therefore, A collection of specialized cells and cell products that perform a specific function is called "tissue".
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Which of the following energy sources is expected to have the least growth in the next 20 years?
a. hydroelectricity
b. coal
c. natural gas
d. nonhydro renewables
How do industrial melanism, insecticide resistance, and antibiotic resistance all support the idea of evolution and natural selection?
Individual water molecules are held to one another by relatively weak ________ bonds.
Individual water molecules are held together by relatively weak hydrogen bonds, which are stronger than other dipole-dipole forces but weaker than covalent or ionic bonds. These bonds contribute to the unique properties of water, extending its liquid state at room temperature and raising its boiling point.
Individual water molecules are held to one another by relatively weak hydrogen bonds. Hydrogen bonds occur when the negative region of one water molecule is attracted to the positive region of another molecule. Even though hydrogen bonds are stronger than other dipole-dipole forces, they are still much weaker than covalent and ionic bonds that hold the atoms within an individual molecule together. It's the collective strength of these hydrogen bonds that helps water remain liquid at room temperature, unlike other similar molecular weight substances like methane or carbon dioxide, which are gases under the same conditions.
In liquid water, there are enormous numbers of hydrogen bonds which collectively endow water with unique properties. For instance, these intermolecular interactions allow water to have a higher boiling point. The hydrogen bonds are indicated with a dotted line in scientific illustrations to reflect their relative weakness compared to the solid lines used for stronger covalent bonds.
Identify the incorrect pair. identify the incorrect pair. synarthrosis; immovable joint amphiarthrosis; slightly movable joint chondrosis; freely moving joint gomphosis; articulation between tooth and bone they are all correct; there is no incorrect pair.
An example in which a species is no longer found anywhere on earth is
For the d3s1358 str locus, which allele arrangement (genotype) was suspect a?
After leaving the stomach, chyme passes into the first segment of the small intestine called the ________
After leaving the stomach, chyme passes into the first segment of the small intestine called as the duodenum. Most of the food is absorbed in this region of small intestine of the digestive system.
What is Digestion?
Digestion is the process of breakdown of the large insoluble food molecules into small water-soluble molecules which helps in absorbing the food particles into watery blood plasma. In some organisms, the smaller water-soluble substances are absorbed through the small intestine into the blood stream directly.
The small intestine makes all the digestive juices which mixes with the bile and pancreatic juice to complete breakdown of complex compounds such as proteins, carbohydrates, and fats. Bacteria present in the small intestine make some of the enzymes required in the digestion of carbohydrates.
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How does incomplete dominance differ from a dominant recessive pair of alleles?
Which organisms are both secondary and tertiary consumers in this food web?
-Chemosynthetic bacteria and amphipods
-Zooplankton and mussels
-Ratfish and octopuses
-Galatheid crabs and zoarcid fish
Which of the following is most likely to cause the greatest disruption to an ecosystem?
Emptying an aquarium containing non-native species into a local waterway
Cutting down a small cedar tree to make holiday decorations
Cleaning the windshield of a car with an alcohol-based glass cleaner
Mowing the lawn in a city park
During ecological succession, how does the growth of young hardwoods affect the organisms living in an ecosystem?
Grasses and low shrubs are unable to obtain the amount of light they need to survive, so there are small numbers of them.
The trees provide shelter and food for a variety of mammals, insects, and birds.
In autumn, falling leaves provide a source of energy for decomposers such as fungi.
All of the above
The organisms that are both secondary and tertiary consumers in this food web, Ratfish, and octopuses. This is because if Galatheid crabs and Zoarcid fish are removed, they become secondary consumers, but now they are tertiary consumers.
What do you mean by Tertiary consumers?Tertiary consumers may be defined as a carnivore at the topmost rank in a food chain that forages on other carnivores.
The statement that most likely causes the greatest disruption to an ecosystem is, cutting down a small cedar tree to make holiday decorations.
During ecological succession, the growth of young hardwoods affects the organisms living in an ecosystem by all of the statements given above.
Therefore, each of the above questions may be described briefly.
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Minnesota department of natural resaws says has introduced regulations that require the use of approved firewood in State parks state florists and wildlife management area is there a specific approval firewood for each area which can’t be used in other protected areas what is the most likely reason for these restrictions
Answer:
B: To avoid the introduction or spread of insects or disease that damage native trees.
What do holes in volcanic rock illustrate about the condition in which it was formed? Wright a short summery paragraph.