A 100% efficient light bulb is the one that converts all the electricity to light without producing any heat. which of that following methods is the most economical way of increasing the light output from a lamp ?
a) Replace the light with a new one
b) Clean the light surface
c) Switch of the bulb
d) None of the above
Answer:
d
Explanation:
Buying a new light bulb will cost money so it is economically inefficient. Cleaning the light surface doesn't increase the light output from the lamp and switching off the bulb means no light at all, therfore the answer is none of the above.
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five impacts of human activity in natural resources
A de-shelled egg is placed in tap water. The egg grows in size.
What is the best explanation for this change in size?
Water moved into the cell by osmosis because the solute concentration was higher inside the cell than outside the cell.
Water moved out of the cell by osmosis because the solute concentration was higher outside the cell than inside the cell.
Ions in the water moved into the cell through diffusion because there were more ions outside the cell than inside the cell.
Water moved into the cell by diffusion because there is more water inside the cell than outside the cell.
Answer:
Water moved into the cell by diffusion because there is more water inside the cell than outside the cell.
Explanation:
The de-shelled egg when placed in water swells because the concentration of water molecules outside the egg is much higher than the concentration of water molecules inside the egg, as a result of which endosmosis takes place and water from the beaker enters into the egg.
How do cells use energy
Answer:
Cell use energy in various ways like during cell division energy is consumed in replication of DNA , also to facilitate transport of certain ions which are not permeable to our cell membrane , also to carry out various bio-chemical reactions and many more.
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Atrazine is an herbicide that prevents plant growth by inhibiting photosynthesis. Atrazine works by binding to proteins in the electron transport chain of photosystem II. Once atrazine binds to the proteins, electrons can no longer travel down the chain to reach photosystem I.
Based on this information, how does atrazine stop plant growth?
A.
It prevents the formation of ATP and NADPH, which are needed by the light-independent reactions to make sugars.
B.
It prevents the formation of NADH and FADH2, which are needed by the light-independent reactions to fix carbon.
C.
It prevents chlorophyll from creating electrons, which are needed by the light-dependent reactions to make sugars.
D.
It prevents water from releasing oxygen, which is needed by the light-dependent reactions to fix carbon.
Answer:
C.
It prevents chlorophyll from creating electrons, which are needed by the light-dependent reactions to make sugars.
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What is gene therapy? Why does it not work well in the real world (research)?
Answer:
What is gene therapy?
Gene therapy is a medical field which focuses on the genetic modification of cells to produce a therapeutic effect or the treatment of disease by repairing or reconstructing defective genetic material.
Why does it not work well in the real world?
A gene can't easily be inserted directly into your cells.
Answer:
Gene therapy has some potential risks. A gene can't easily be inserted directly into your cells. Rather, it usually has to be delivered using a carrier, called a vector. The most common gene therapy vectors are viruses because they can recognize certain cells and carry genetic material into the cells' genes.
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Which molecules make up carbohydrates?
1.nucleotides
2.nucleic acids
3.monosaccharides
4.O amino acids
Answer:
b
Explanation:
Answer: monosaccharides
Explanation:
Outline the fate of food after absorption.
Answer:
The small intestine absorbs most digested food molecules, as well as water and minerals, and passes them on to other parts of the body for storage or further chemical change. Specialized cells help absorbed materials cross the intestinal lining into the bloodstream.
Which statement about chromosomes is correct?
1.A gene is made up of one allele on a single chromosome. A person’s sex cells contain that single allele.
2.A gene is made up of two alleles on the same chromosome. A person’s sex cells contain one of the alleles.
3.A gene is made up of one allele spread over two chromosomes. A person’s sex cells contain that single allele.
4.A gene is made up of two alleles on separate chromosomes. A person’s sex cells carry one allele for each gene.
Answer:
4 option is correct
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which element must your food contain so that your body can make new nucleic acids?
Answer:
A or C i put my bets on A
Explanation:
Answer:
D
Explanation:
D
explain the flow of the blood in and out of the heart.
Answer:
The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.
What is the difference between a nocturnal and a diurnal animal?
Answer:
They make animals survive hence developing different mechanisms in order for them to survive at a different biological clock. The main difference between nocturnal and diurnal animals is that nocturnal animals are the animals that are most active during the night time while diurnal animals are animals that are most active during the daytime.
Explanation:
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A community needs more electrical energy. The community is located in an area with the following characteristics : Average wind speed of 15 to 20 mph . One small river with slow currents Rainy conditions most of the year No coal or oil deposits Based on this information, which alternative energy source should the community consider investing in?
A Biopower
B hydropower
C Solar energy
D Wind energy
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The leaves of a plant are dotted with openings known as stomata when open stomach allow the plant to exchange to games and allow moisture to evaporate helping to draw water from the roots up into the plant these activities help the plant to
Why does fast moving or falling water turn white?
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Answer:
When water is moving fast, it bounces with other particles of water and it jumps and comes back to its normal place, while it jumps, there are tiny air bubbles of water that get between the two layers of water. And when this happens in a very great amount, then the water turns white.
Explanation:
When fast moving water is there, then the water particles bump on to each other, what happens is that as you know, when something bumps to another thing, it bumps and goes away, so same does the water, the water goes away, and then it comes back. but in the between time, tiny air particles and tiny airbubbles become trapped in the middle. When they get trapped, they make a white color.
So that was why, fast moving water turns white.
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Why would the energy industry be interested in developing technologies to transform the kinetic energy in ocean waves to electrical energy?
Answer:
Ocean waves contain huge energy potential. Wave power gadgets extricate energy straightforwardly from the surface movement of ocean waves. In numerous spaces of the world, the breeze blows with sufficient consistency and power to give ceaseless waves along the coastline.
Explanation
:
In simpler words it’s a great power source to use to get electrical energy for starters it’s completely pollution-free and a renewable energy source.
It’s completely pollution-free and a renewable energy source.
What is a renewable source of energy?Renewable energy is created from naturally replenishing and endless sources, such as the sun and wind. Transportation, space and water heating and cooling, and electricity generation are all possible with renewable energy.Non-renewable energy is derived from limited resources that may run out, such as fossil fuels like coal and oil. Numerous benefits of renewable energy exist and have an impact on the national economy, the environment, national security, and public health. Enhanced national power grid resilience, security, and reliability. The generation of jobs across all sectors utilizing renewable energy reduced air pollution and carbon emissions from energy generation.More affordable since various forms of renewable energy can compete on price with conventional energy sources. Increased access to renewable energy for distant, coastal, or island communities without grid connections.To learn more about renewable energy, refer to
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Why is heart disease so prevalent in the United States?
Answer:
High blood pressure, cigarette smoking, and high blood cholesterol are still major contributors to the national epidemic of cardiovascular disease. High blood pressure affects approximately 1 in 3 adults in the United States,3 and only about half of them have it under control.
Explanation:
Compared to a natural forest, the wheat field of a farmer lacks
Which of the following is true about respiration in plants?
Plants do not respire.
Plants respire at night.
Plants respire all the time.
Whereas animals produce carbon dioxide, plants produce oxygen at the end of
respiration.
Answer: Plants respire at night.
Explanation:
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In Plants photosynthesis can only take place in the presence of sunlight during the day, respiration happens all day long, hence option c is correct.
What is respiration in plants?Plants' respiration is visible at night and day, plants consume oxygen during respiration while also releasing carbon dioxide. Both photosynthesis and respiration take place during the day.
However, only respiration takes place at night, which uses oxygen. A sequence of chemical processes known as cellular respiration converts glucose into ATP, which may then be utilized as energy for a variety of bodily functions.
Glycolysis, citric acid cycle, and oxidative phosphorylation are the three basic processes that take place during cellular respiration.
Therefore photosynthesis takes place during the day but plants respire all the time, hence option c is correct.
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When were the first pictures of the Milky Way taken?
Answer:
The first pictures of the Milky Way were taken on May 20, 1990.
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Some jellyfish are transparent, how will this affect their ability to survive?
So predators cannot see it as well
Explanation:
It will affect their ability to survive because...since Jellyfish bodies are transparent, that means they are less visible to predators or threats. Which will affect their way to survive because since they are less visible to predators, it gives them a better chance for survival since their predators can't see them very well. It also gives them a better chance for survival because hunters won't be able to see them well enough to catch them because they blend in with the water, which is called transparent.
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A drug that is meant to reduce blood pressure would have which of the following effects?
Increase kidney reabsorption
Decrease resting heart rate
Dilate the blood vessels
Constrict the blood vessels
Answer:
Dilate the blood vessels
Explanation:
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Blood arteries would be dilated by a medication intended to lower blood pressure. So, the correct option is C.
What is Medication?A substance used to treat, diagnose, or prevent disease is known as a medication. A significant area of medicine is drug therapy, which depends on the growth of pharmacology science and the administration of pharmacy. There are many different categories for drugs.
A dose form including one or even more active chemicals as well as potential inactive ones. The dosage forms of medications include tablets, capsules, liquids, lotions, and patches, among others. Moreover, they can be administered in a variety of methods, including orally, intravenously, or as drops in the ear or eye. A drug intended to reduce blood pressure, for instance, would dilate blood vessels.
Therefore, the correct option is C.
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which activities of the body are controlled by the autonomic nervous system?
Explanation:
The autonomic nervous system controls internal body processes such as the following:
Blood pressure
Heart and breathing rates
Body temperature
Digestion
Metabolism (thus affecting body weight)
The balance of water and electrolytes (such as sodium and calcium)
The production of body fluids (saliva, sweat, and tears)
Urination
Defecation
Sexual response
Which element is most likely to replace hydrogen in a displacement reaction?
(1 point)
O lithium (Li)
O helium (He)
O bromine (Br)
O oxygen (O)
Answer: The correct option is (D) lithium (Li).
Explanation: Hydrogen is the element which belong to period 1. The atomic number of hydrogen is, 1
The electronic configuration of hydrogen is,
The number of valence electrons present in hydrogen is, 1.
(A) Helium is the element which belong to period 1. The atomic number of helium is, 2
The electronic configuration of helium is,
The number of valence electrons present in helium is, 2.
(B) Oxygen is the element which belong to period 2. The atomic number of oxygen is, 8
The electronic configuration of oxygen is,
The number of valence electrons present in oxygen is, 6.
(C) Nitrogen is the element which belong to period 2. The atomic number of nitrogen is, 7
The electronic configuration of nitrogen is,
The number of valence electrons present in nitrogen is, 5.
(D) Lithium is the element which belong to period 2. The atomic number of lithium is, 3
The electronic configuration of lithium is,
The number of valence electrons present in lithium is, 1.
From this we conclude that the lithium element has the same number of valence electrons as hydrogen.
Hence, the correct option is (D) lithium (Li).
The element that can be considered as a replacement for hydrogen in displacement reaction is lithium (Li)
Displacement reaction can be regarded as type of reaction whereby atom is been displaced by another atom in a molecule. Hydrogen has one valence electrons which is the same as the valence electrons in Lithium, and this implies that it can replace Hydrogen in a displacement reaction.Therefore, option A is correct.
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Which of the following muscles does NOT originate on the scapula?
Answer:
d. Pectoralis major
Explanation: does NOT
building units of DNA
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what is the transfer of genes from one population to another called ?
Answer:
Gene flow
Explanation:
Answer:
Gene flow is the movement of genes into or out of a population. Such movement may be due to migration of individual organisms that reproduce in their new populations, or to the movement of gametes (e.g., as a consequence of pollen transfer among plants).
Select the correct answer.
The image shows EKGs of a person with normal heart waves and of a person having tachycardia. Based on this image, what kind of condition
is tachycardia?
The correct answer based on the question made in the picture is A. the heart beats abnormlly fast.
What kind of condition is tachycardia?Tachycardia is a heart condition in which the heart rate increases over 100 beats per minute. This occurs when cardiac impulses do not work properly and this in the long term can cause severe problems.
There are several types of tachycardia, It is not always a problem, sometimes It can be in response to exercise or stress.
In the types of tachycardia we can find: atrial fibrillation, ventricular tachycardia, atrial flutter, supraventricular tachycardia, ventricular fibrillation.
Therefore, we can confirm that the correct answer based on the question made in the picture is A. the heart beats abnormlly fast.
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What type of animal symmetry also includes the formation of a head? What is this process called?
Those with radial symmetry display cephalization.
Those with radial symmetry have an oral side.
Those with asymmetry display cephalization.
Those with bilateral symmetry display cephalization.
Answer:
Bilateral symmetry display cephalization
Explanation:
