Firstly, why does yellowing of leaf tissue occurs? It occurs because of lack of chlorophyll. These phenomenon is called chlorosis. The reason for chlorosis can be many like poor drainage, damaged roots, compacted roots, high alkalinity, and nutrient deficiencies in the plant.
The condition described here indicates presence of certain minerals like calcium, zinc, manganese, phosphorus, or copper in high amounts in the soil which tie up with iron making it unavailable to plant. Iron is necessary for the formation of chlorophyll (which gives green color) and is also necessary for many enzymes involved in plant metabolism. Chlorosis is mostly associated with lack of iron.
Final answer:
The excess mineral causing impacts on the plants is most likely metals such as lead, cadmium, and chromium, which enter the environment through industrial activities like mining and metallurgy. These toxic metals can contaminate the soil and water, making them acidic and affecting the plants.
Explanation:
The excess mineral that is causing impacts on the plants in the area is most likely metals, such as lead, cadmium, and chromium, which can enter the environment through industrial activities like mining and metallurgy.
These toxic metals, when present in excess amounts in the nearby river, can contaminate the soil and water, making them acidic. The acidic soil and water then affect the plants, causing yellowing of leaves, frequent leaf abscission, and fading of the plants.
This is similar to the effect of acid rain on plants and the environment, where the acid rain makes the soil and water acidic, leading to damage to plants, aquatic life, and structures.
What would be the ploidy of the viable gametes produced by a tetraploid individual if nondisjunction of all chromosomes occurred in meiosis I?
a. Diploid
b. Tetraploid
c. Haploid
d. Triploidraploid individual and a diploid individual produces biologically fit offspring.
A. Diploid
During meiosis, the number of chromosomes is reduced by half. Since a tetraploid cell has four copies of each chromosomes, gametes produced from that cell would be diploid, having only two copies of each chromosome.
Final answer:
Viable gametes produced by a tetraploid individual with nondisjunction of all chromosomes in meiosis I would be diploid, containing two sets of chromosomes. The correct answer is c. Haploid.
Explanation:
The ploidy of the viable gametes produced by a tetraploid individual if nondisjunction of all chromosomes occurred in meiosis I would be diploid. Nondisjunction during meiosis I results in gametes that contain two sets of chromosomes instead of the normal one set (haploid). In the case of a tetraploid organism, which has four sets of chromosomes (4n), nondisjunction would result in gametes with two sets of chromosomes (2n), hence, those gametes are diploid.
Which process in the carbon cycle takes the longest to complete? A. formation of fossil fuels B. respiration in animals C. photosynthesis in plants D. emission of waste
ANSWER:- option A formation of fossil fuels.
Explanation:-
So, the formation of fossil fuels is the phenomena which takes the longest time in the carbon cycle.
Formation of fossil fuels is a process in the carbon cycle that takes the longest time to complete.
How much time taken by fossil fuel formation?Fossils are the remains of organisms that died more than 10,000 years ago so this means that 10,000 years are required for the formation of fossil fuel.
So we can conclude that formation of fossil fuels is a process in the carbon cycle that takes the longest time to complete.
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Earth's initial atmosphere probably contained higher levels of water vapor than today's atmosphere. Most of the water vapor left the atmosphere due to the _____ of Earth.
A. cooling
B. rotation
C. warming
D. revolution
The best answer i see is A)- Cooling
i hope this is right and it helps you
Answer:
Earth's initial atmosphere probably contained higher levels of water vapor than today's atmosphere. Most of the water vapor left the atmosphere due to the a) cooling of the earth.
Explanation:
To understand this answer we need to understand the characteristics of cold and hot air. First of all, hot air or in this case water vapor due to physics tends to go up, while cold air or vapor tends to go down. This can be observed in the process of raining. Vapor always goes up and comes down to earth in the form of water, mist or snow. However, in that time the vapor didn't come down and kept going up because the atmosphere was not developed and the earth's cooling was responsible for that. Because it didn't have the pressure and gravity it has today.
Which statement is best supported by this table?
A. The polar bear faced a long-term change.
B. The tree frog faced a short term change.
C. The dodo bird and tree frog faced long-term changes.
D. The armadillo and dodo bird faced short-term changes.
The table shows four species that have had to make changes due to an environmental change.
I think the answer is C
The correct answer is option C, The dodo bird and tree frog faced long-term changes
In the table the Dodo bird became extinct which means it will never be seen again in future. Since it is a change which will continue forever in the coming future , it can be stated as a long term change
Also the tree frog adapted something and this will also continue for a long period of time until unless some other evolutionary change is introduced. Thus it is also a long term change.
A population with a higher death rate than birth rate may still have positive growth. This statement is
Answer:
True
Explanation:
Although overall, birth rate and death rate play a major role in determining the population of an area however there are many other factors too which influence the population of an area. These factors are :
ImmigrationEmigrationImmigration means the number of people from an other area coming to another area whose population is under study. For example: We are talking about a country Antarctica where population has a higher death rate than birth rate. However, every year millions immigrants come there to spend the life. therefore, even if death rate is higher than birth rate, the overall growth of the population can be positive.Emigration means the number of people leaving an area of whose population is studied. So if emigration rate of such a population is very low and immigration rate is very high, then even if death rate is higher than birth rate, the overall growth of the population can be positive.Hope it help!
Nutrients that become part of the body tissue but are needed in only small amounts to help the body work properly are ?
the answer is minerals are nutrients that become part of the body tissue and are needed that help the body work properly.
Jason, a dog breeder, decides to mate a poodle with a golden Labrador Retriever. He wants to get puppies with the curly hair of the poodle and the color of the Labrador. What concept is shown in this example?
Question 6 options:
Artificial Selection
Adaptation
Evolution
Natural Selection
The correct answer is Artificial Selection
Artificial Selection is a selection process of desired characters in plants and animals through breeding. in In the process of Artificial Selection the offspring with desired characters is actively selected. Artificial selection is carried by selective breeding. This practice is very old and started before Darwin's theory of evolution and the discovery of genetics. Farmers chose with beneficial traits which could be heritable. Beneficial traits are studied and spend a lot of time calculating how heritable these traits can be.
Final answer:
The example of breeding a poodle with a golden Labrador Retriever for specific traits such as curly hair and color represents Artificial Selection, where humans selectively breed for desired characteristics.
Explanation:
The concept shown in the example where Jason decides to mate a poodle with a golden Labrador Retriever in order to get puppies with the curly hair of the poodle and the color of the Labrador is Artificial Selection. This method involves human intervention to select traits that are desired, such as fur type or color, in order to breed offspring with those specific characteristics. Artificial selection is different from natural selection, as it relies on human choice rather than environmental pressures. The breeding of Labradors, where fur color is controlled by the alleles E and B, with the presence of epistasis influencing the coat color, is also an example of artificial selection being applied.
How do doctors detect abnormalities in patients with the help of an EKG?
A.
by determining changes in the heartbeat
B.
by determining changes in blood pressure
C.
by determining changes in blood components
D.
by determining changes in arterial blood flow
B) by determining changes in blood pressure
it could be A as well but B is more likely....
For example, if you have high blood pressure, the EKG may show that your heart has become enlarged due to the extra work of pumping blood under higher pressure
Answer:
the answer is B
Explanation:
Which of the following could you treat with an antibiotic?
A Mumpls, measles
B german measles
C Staphylococcus and Streptococcus bacterial infection
D HIV, genital herpes
E common cold, influenza
Skeletal muscle cells are usually attached to bone by
A. fascicles.
B. ligaments.
C. tendons.
D. flexors.
C. Tendons
Tendons are connective tissues that are able to attach muscles to bones. They are found through out the body especially at the end of each muscle. Including the human eyeball where tendons are used to connect muscles to other parts.
• Fascicles are fibers which cannot be attach skeletal muscles to the bone.
• Ligaments are connective tissues which connect bones to joints.
• Flexors are muscles that are able to stretch a body part.
Skeletal muscle cells are attached to bones by tendons, which are tough connective tissues that enable the movement of bones at joints when muscles contract.
Explanation:Skeletal muscle cells are usually attached to bone by tendons. Tendons are tough connective tissues that connect skeletal muscles to the skeleton, allowing for the movement of bones at a joint. When muscles contract, the tension is transmitted through these tendons which in turn pull on the bones, facilitating movement.
Tendons are composed of dense, regular connective tissue and are integral for the interaction of skeletal muscles in the body. This connection to bones is crucial for muscles to perform functions like maintaining posture, stabilizing bones and joints, controlling internal movement, and generating heat.
If your skin is punctured, it will protect your body from infection by A) becoming immune. B) producing a fever. C) becoming inflamed. D) producing antibodies.
Final answer:
When the skin is punctured, the body responds by becoming inflamed to protect against infection, involving immune responses such as blood vessel dilation and white blood cell activation.
Explanation:
If your skin is punctured, it will protect your body from infection by C) becoming inflamed. Inflammation is the body's response to injury or infection, and it entails a series of immune activities designed to contain and eliminate the invading pathogens. This response includes the dilation of blood vessels, which leads to the affected area becoming red and warm. In addition, it involves the attraction and migration of white blood cells, known as neutrophils, to the wound, where they contribute to the defense against infection.
PLEASE HELP! 20 POINTS! This is an Anatomy question.
At a myoneural junction, what is the function of the motor end plate?
To release neurotransmitters that travel toward the axon terminal
To bind neurotransmitters and generate an action potential in the sarcolemma
To release sodium and potassium that travel toward the axon terminal
To bind sodium and potassium and generate an action potential in the sarcolemma
Answer:
To bind neurotransmitters and generate an action potential in the sarcolemma
Explanation:
A Myoneural junction is also known as A neuromuscular junction that basically is a chemical synapse which is created when a motor neuron contacts a muscle fiber. This synapse made between a spinal motor neuron and skeletal muscle cell has a specific structure due to which it is called the motor endplate.
Now what is the function of this motor endplate?
We already know that in response to a stimuli a series of events start in nervous system which lead to the production of a response. For example, when we touch a hot object a signal travels through Central nervous system and the response occurs when we move our hands away from the hot object.
Now, taking this same example, what happens is that when a response has to be produced , for example muscle contraction, the neurons which act there are called motor neurons. When the motor nerve is stimulated due to arrival of a nerve impulse in the motor nerve terminals, the first response occurs with the help of motor endplate.
The arrival of motor neuron causes an action potential at presynaptic neuron terminal that opens up calcium channels and Ca2+ ions into the presynaptic neuron's cytosol causing several neurotransmitter molecules to fuse with the presynaptic neuron's cell membrane
Here, the neurotranmsitters like acetylcholine binds with the receptors present in the motor end plate. As soon as they bind with the receptors on motor end plate, an influx of Na+ ions occurs that triggers an action potential. When action potential is triggered it travels along the sarcolemma and into the muscle fiber which initiate the muscle contraction. This muscle contraction is the response to a certain stimuli and in the example we discussed it will be bringing our hand away from the hot object.
This is a long and complex mechanism which i tried to summarize, You can get a better idea by looking at the diagram attached.
Gene therapy is a way doctors can treat a disease by inserting a healthy gene into a patient's cells, instead of using drugs or surgery. The new version of the gene helps the patient's body fight the disease. Gene therapy is A) considered a very safe technique. B) still being researched and is not used on humans. C) still being tested and is used for diseases that have no cure. D) used frequently today to prevent many common childhood diseases.
The answer is; C
Gene therapy is still not considered safe and has not been approved for humans, especially due to errors in inserting of DNA at the target site and also random relapse of the DNA from its inserted site. Gene therapy, however, can be sanctioned when its benefits outweigh its risks such as in terminally ill patients - with the approval of the patient and local relevant policies/authorities. Gene therapy, today, is being tested with innovative tools called CRISPR/Cas9.
Answer: C) still being tested and is used for diseases that have no cure.
Explanation: It is considered as risky and is only used for diseases with no cures. It's not used for those diseases with many cures and it is not safe.
What is the reason that linked genes are inherited together?
A.
They are located close together on the same chromosom
B.
The number of genes in a cell is greater than the number of chromosomes.
C.
Chromosomes are unbreakable.
D.
Alleles are paired together during meiosis.
E.
Genes align that way during metaphase I of meiosis.
Answer:
[tex]\boxed{\bf~A.}[/tex]
A little basic info:
Chromosomes are molecules of DNA that carry groups of genetic information. Some genes group up in the same chromosome, and this it what we'll see below.
Why are linked genes inherited together? What are they?
This question is more simple than it looks, since there's really little to explain. Linked genes, are genes inherited through the same chromosome:
→ When 2 genes tend to group-up on the same chromosome, they tend to be inherited together, but still, this doesn't happen always and the probablity of this happening is just slightly above 50%.
Remember:
Only genes that sit close together on a chromosome are likely to be inherited together, because if they're to far apart in the chromosome, the process of (homologous) recombination might separate them.
→ To make things simple, homologous recombination is when similar DNA moleculas are moved and recombined in a different way.
Hope it helped,
BioTeacher101
The reason that linked genes are inherited together is Linked genes are inherited together because they are located close to each other on the same chromosome.
The correct answer is A.
During the process of meiosis, which is responsible for the formation of gametes (sperm and eggs), homologous chromosomes pair up and can exchange segments of genetic material through a process called recombination or crossing over. However, when genes are located very close together on the same chromosome, the likelihood of recombination between them is reduced. As a result, these genes tend to be inherited together as a unit, maintaining the linkage between them.
The phenomenon of linked genes was first described by Thomas Hunt Morgan in his studies on fruit flies, where he observed that certain traits were consistently inherited together due to their close proximity on the same chromosome.
Hence , A is the correct option
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