Answer:
An enzyme is a substance that speeds up a chemical reaction without being used up in the reaction.
Answer:
Catalyst
Explanation:
One example of a catalyst is yeast, it helps speed up the process of bread becoming fluffy, for example
Water enters a cell when there is more salt IN the cell than the extracellular environment. This is an example
of
a. equilibrium
b. hypotonic
c. isotonic
d. hypertonic
Answer:
it would be b. hypotonic
I heard that Bloodtype O is strong to the malaria virus. Can someone tell me why is that? I need direct sources for the information. Thank you.
Answer:
With neither A or B antigens, this blood group has different receptors on its red blood cells, and these are not as easily taken over by malaria. "Hence, rosettes formed in blood group O [red blood cells] tend to be smaller, weaker and more unstable," the authors write in the new review
Explanation:
in order to perform, a chemist needs an element that has similar properties to potassium (K) but has a lower atomic mass. which element should the chemist select for the experiment?
A. Robidium (Rb)
B. Sodium(Na)
C. Magnesium(Mg)
D. Calcium(Ca)
The element needed by the chemist to perform the experiment with similar properties to that of potassium, while having lower atomic mass is option B. Sodium.
If we take a look at the periodic table, we can see all the elements that share properties with potassium are located within the same column. Some examples are :
SodiumRubidiumCesium LithiumOf the elements listed, only two are found within the options for this question, which means that we can discard option C and D.
We can then proceed to analyze the atomic mass of each element in an attempt to choose the option with a lower atomic mass than Potassium. Option A, Rubidium, has an atomic mass that is much higher than the 39 of potassium, which means we can discard option A. The correct choice is option B, Sodium , since it shares similar properties and has an atomic mass of 22.
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What was a positve aspect of interaction between French settlers and American Indians?
1: American Indians gained access to manufactured goods.
PLEASE HELP ME Are humans predators in their ecosystem? Explain in at least 5 sentences.
Their new study shows that humans are strange predators. Unlike other animals, we target adult prey in large numbers. That is a practice that can push populations of those prey into decline, the researchers warn. People mainly target — at least among wild mammals and fishes — prey that are old enough to reproduce.
Humans are considered to be apex predators in their ecosystems due to their ability to manipulate and dominate other species through hunting, agriculture and urbanization.
Why are human predators?Humans are considered to be apex predators in their ecosystem due to their ability to manipulate and change their environment to suit their needs. Humans have the ability to hunt and consume a wide variety of other organisms, including other predators. Humans also have a significant impact on the environment through activities such as deforestation, pollution, and hunting.
However, humans are also capable of acting as stewards of the environment and preserving biodiversity through conservation efforts. The relationship between humans and their ecosystem is complex and multifaceted.
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during diffusion,how do the molecules physically get from one place to the other?(spaceship tractor beam? wiged monkeys?)
Which of the following is an example of maintaining homeostasis?
Answer:
Explanation:
Humans' internal body temperature is a great example of homeostasis. ... That's an example of homeostasis being maintained. When you get shivery in the cold, or sweat in the summer, that's your body trying to maintain homeostasis. Glucose is the most basic form of sugar, and the only type the body can use directly.
Answer:
c
Explanation:
it saws that warming up and cooling down is a part of homeostasis.
Part D
Follow these steps and study the table to answer the question,
1. Go to the Weekly US Map: Influenza Summary Update e. At the top of the map, click the back arrow
several times until the map no longer changes. If the current season is shorter than 6 months, view
the previous season with the drop down box. Note how the trends change over time.
2. Review the following data table, which represents the estimated number of deaths, medical visits,
illnesses, and hospitalizations averted by the flu vaccine during several flu seasons.
Averted Deaths
Averted Averted Averted
illnesses Medical Visits Hospitalizations
Pneumonia and Respiratory and
Influenza Circulatory
Deaths Deaths
Fraction
Number Number Number prevented Number Number
(%)
2010-2011 5,039,277 2,514,353 70,821 20.8
3,434
9,880
2011-2012 1,981,571 968,312 39,301
2012-2013 5,628,332 2,701,875 61,522 11.1
1,823
5,280
2013-2014 6,683,929 3,080,284 86,730 21.5
3,840
2014-2015 1,606,813 792,958 47,449
1,419
2015-2016 5,083,498 2,504,323 71,479 18.9
2,882
Season
22.7
1,227
3,618
9,172
7.5
Using the data you just reviewed, create a scientific argument of one to two paragraphs that support or
oppose the current flu vaccine recommendations.
Answer:
Flu vaccinations are fundamental as they reduce the risk of flu illness by over 50%.
Explanation:
Flu vaccinations reduce the risk of flu illness by over 50%. This makes this process extremely important and fundamental for all human beings as they not only protect the person who gets the vaccine, but it also contributes to the prevention of spreading to other people, especially children and older adults who possess a greater risk of developing flu complications.
The antibodies that are produced by the vaccine prevent the flu virus from attaching to a healthy cell. However, if a person has not been vaccinated, the virus will attack the healthy cells because there is an absence of antibodies that prevent this process.
Molecules that contain carbon and make up livin things
PPPLLLEEEAAASSSEEE HHEELP!!!
Answer:
it is a bit con fusing can you turn it to text
What features do we find only in the cells of bacteria?
What features do we find only in the cells of animals?
What features do we find only in the cells of plants?
Answer:
In bacteria cells, you would find pili (only found in bacteria and archaea) and DNA not contained in a nuclear envelope/nucleus. These are, for the majority, exclusively found in bacteria cells.
In animal cells, you would find lysosomes and centrosomes. These organelles are exclusively found in animal cells.
In plant cells, you would find plastids, such as chloroplasts or amyloplasts. More specifically, chloroplasts are exclusively found in plant cells as they are necessary for photosynthesis to occur.
Explain the process of DNA isolation.
Answer:
Lysis, precipitation and purification
Explanation:
DNA isolation is a molecular biology technique based on the extraction of DNA and subsequent purification to remove inhibitors that may hamper the process of amplification. DNA isolation consists of three steps:
1- Lysis: it consists of the mechanical disruption of the cell, where the nucleus is broken to release DNA. During this process, it is required to use enzymes and detergents such as Proteinase K
2- Precipitation: during this process, the DNA is precipitated by using alcohol and salt.
3- Purification: this process removes the impurities from DNA. Extraction is carried out by washing DNA with ethanol and water.
6.) A dog named Rascal leaves his home and travels a short distance and
then returns home. The graph shows his position as a function of time.
How does his velocity on his return trip compare to his velocity for the
first 5 seconds?
Answer:
If your on USA testprep then the correct answer is D !
Explanation:
Answer:
THE CORRECT ANSWER IS: His velocity on the return trip was twice as fast when compared to the first 5 seconds.
Explanation:
Gim kit
What is density of a liquid with mass of 17.4 and a volume of 20 mL ? Would this liquid float or sink at room temperature based on its density and the known density of water?
Answer: The density of the liquid is 0.9 g/mL
. Hope this helps but I can not answer the second part. Hope that it is beneficial to you anyway! :)
(Edit) This might help you figure it out: The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.
Explanation:
Answer:
i think it would float tbh
Explanation:
sorry if it isnt correct i am just trying to help
According to Darwin, evolution
takes place by a process called
random choice.
True or false
Answer:
True
Explanation:
Natural selection
I need help please !
Answer:
14. f. diffusion
15. a. excreting waste
16. b. exocytosis
17. a, endocytosis
Explanation:
14. The movement of molecules from a high concentration to a low concentration is diffusion. Active transport uses energy to move molecules against their concentration gradient (from low to high). Osmosis specifically refers to water molecules. Endocytosis is the movement of molecules inside the cells via the cell membrane engulfing it.
15. The membrane controls the substances that enter and exit the cell, therefore it is involved in excreting waste products from inside the cell.
16/17 Endocytosis is engulfing substances to bring them inside the cell. Exocytosis is the reverse process, where substances exit the cell by fusing with the cell membrane. The movement of molecules from a high concentration to a low concentration is diffusion. Osmosis specifically refers to water molecules.
Which of the following is false
1. Cells form tissues
2. Tissues for organ systems
3. Organs form organ systems
Answer:
2 is false
Explanation:
tissues don't form organ systems
If convection cells in the asthenosphere are the mechanism behind plate tectonic movement, what powers the convection cells?
a) energy from the sun
b) energy from the earth's core
c) air pressure changes
d) energy from magma
The energy that powers the convection cells is ENERGY from the earth's core (Option B).
Convection currents, also known as convection cells, are caused by density differences within a body of liquid or gas. Convection cells inside of the Earth form as material near the Earth's core heats up.The asthenosphere refers to the upper mantle layer beneath the lithospheric mantle which is involved in plate tectonic movement.The heat inside the Earth's core heats the asthenosphere, which is associated with the movement or 'motion' of convection cells.In conclusion, the energy that powers the convection cells is ENERGY from the earth's core (Option B is correct).
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In eukaryotic organisms, genes usually consist of two alleles. The two alleles are often on different parts of the same chromosome.
These sentences contain incorrect information. Which option describes the mistake?
Answer:
what are the options? need more info
5. A system of membranes and tubes that create
passages through which materials can pass? |
Answer:
paper or glass
Explanation:
for they use needles to get and they transfer it to paper for studying
Answer: paper
Explanation:
1. Quasars are extremely distant celestial bodies. Investigators
using a special telescope determined that a certain quasar
was emitting waves with a frequency of 1.41 x 10° Hz. An
electromagnetic spectrum is shown.
gamma rays
visible light
Radio
waves
Electromagnetic Spectrum
Infrared Visible Ultraviolet
rays light waves
microwaves
Microwaves
Gamma
rays
X-rays
102
102
10-30
10-12
10-5
5 x 10 10
Wavelength (m)
d
X-rays
www
CLEAR ALL
10*
10
10
1020
102
101 10'
Frequency (Hz)
C
The investigators were most likely using a telescope that
detects-
Answer: microwaves
Explanation:
The investigators were most likely using a Telescope that detects ; ( C ) microwaves
From the electromagnetic spectrum provided the wavelength of a microwave is 10⁻² and the frequency of the microwave is about 10⁸ Hz which is closest to 10⁹ Hz. Given that the frequency detected with the use of the spatial telescope was 1.4 * 10⁹ Hz.
The most likely wave that this telescope would detect is Microwave because its frequency falls within the closest frequency range of the telescope.
Hence we can conclude that The investigators were most likely using a Telescope that detects ; ( C ) microwaves
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The human body is composed of cells, organs, organ systems, and tissues. How are these organized?
A) Groups of cells form tissues.
B) Groups of organs form tissues.
C) Groups of organ systems form tissues.
D) Groups of tissues form organ systems.
PLZ HELP
Answer:
C) Groups of organ systems form tissues.
Explanation:
Is this right? NEED HELP ASAP
Answer:
They all seem to be correct, good job!
Answer:
Correct
Explanation:
Choose all the answers that apply.
Muscles in the small intestine are _____.
smooth
striated
involuntary
voluntary
cardiac
Pls pick multiple
Answer:
smooth and involuntary
Two layers of smooth muscle form the small intestine. The outermost layer is the thin, longitudinal muscle that contracts, relaxes, shortens, and lengthens the gut allowing food to move in one direction. The innermost layer is a thicker, circular muscle.
Also smooth muscle is not under our control so is called involuntary
Which of the following is NOT a source of nitrogen that is available to plants?
Answer:
I CANT SEE THE FOLLOWING BUT I WILL EXPLAIN.
Explanation:
Plants usually absorb nitrogen from NO3- and NH4+
Nitrogen oxides released into the atmosphere by burning fossil fuels and organic matter is not a source of nitrogen which is available to plants. Thus, the correct option is D.
How does plants take nitrogen?Plants require nitrogen as it is a macronutrient. The deficiency of this nutrient can cause many diseases. However, plants cannot themselves obtain the nitrogen from air but they rely mainly on the supply of combined nitrogen atom in the form of ammonia molecule, or nitrate molecule, resulting from the nitrogen fixation through free-living bacteria in the soil or the bacteria living symbiotically in the nodules on roots of legumes.
Plants can take nitrogen through absorbing the soil by their roots. Plants cannot get this nitrogen directly from the air. Although, the nitrogen element is abundantly available in air. Nitrogen is unreactive atom, and it cannot be used by the green plants to make proteins. Nitrogen gas needs to be converted into nitrate compounds in the soil through nitrogen-fixing bacteria in soil, root nodules or lightning. Every nitrogen atom is triple-bonded to another nitrogen atom to form the molecular nitrogen, N₂.
Therefore, the correct option is D.
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Your question is incomplete, most probably the complete question:
Which of the following is NOT a source of nitrogen that is available to plants?
A - Decaying plant matter
B - Animal waste products
C - Synthetic nitrogen containing fertilizers
D - Nitrogen oxides released into the atmosphere by burning fossil fuels and organic matter
Which of the following is the distinguishing feature of prokaryotic cells?
Prokaryotic cells have a nucleus.
Prokaryotic cells do not have a cell wall.
Prokaryotic cells do not have a nucleus.
Prokaryotic cells have mitochondria.
Answer: The answer is C
A prokaryotic cell usually lack a well defined nucleus. The correct option is C.
What is a prokaryotic cell?A prokaryotic cell is one that lacks a true nucleus and membrane-bound organelles.
The prokaryotic cell is the foundation of organisms in the domains Bacteria and Archaea.
Thus, the correct option is C.
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Which scientist discovered the electron?
Answer:
J.J. Thomson
Explanation:
He was the first one to discover the electron
Answer:
Thomson
Experiments with beams of negative particles were performed in Britain by Joseph John ("J.J.") Thomson, and led to his conclusion in 1897 that they consisted of lightweight particles with a negative electric charge, nowadays known as electrons. Thomson was awarded the 1906 Nobel Prize
Name all four of the macromolecules. Identify the monomer (building block) for each macromolecule.
Answer:
Lipids - polymers called diglycerides, triglycerides; monomers are glycerol and fatty acids
Proteins - polymers are known as polypeptides; monomers are amino acids
Nucleic Acids - polymers are DNA and RNA; monomers are nucleotides, which are in turn consist of a nitrogenous base, pentose sugar, and phosphate group
Carbohydrates - polymers are polysaccharides and disaccharides*; monomers are monosaccharides (simple sugars)
PLZ BRAINLIEST
Use humus in a sentence.
Answer:
Explanation:
1.It is covered with a thick sheet of black earth, a kind of loess, that is mixed with humus.
2.The nitrogen in decaying roots, in the dead stems. and leaves of plants, and in humus generally is sooner or later changed into a nitrate, the change being effected by bacteria.
Is mass conserved in chemical reactions?
Answer:
Mass is not conserved in chemical reactions. ... This means that the total mass and energy before a reaction in a closed system equals the total mass and energy after the reaction. According to Einstein's famous equation, E = mc2, mass can be transformed into energy and energy can be transformed into mass.
Explanation:
Answer:
Mass is not conserved in chemical reactions. The fundamental conservation law of the universe is the conservation of mass-energy. This means that the total mass and energy before a reaction in a closed system equals the total mass and energy after the reaction. According to Einstein's famous equation, E = mc2, mass can be transformed into energy and energy can be transformed into mass. This is not some exotic process, but in fact happens every time there is a reaction. Mass is therefore never conserved because a little of it turns into energy (or a little energy turns into mass) in every reaction.