Answer:
Polar and charged amino acid residues (the remainder after peptide bond formation) are more likely to be found on the surface of soluble proteins where they can interact with water, and nonpolar (e.g., amino acid side chains) are more likely to be found in the interior where they are sequestered from water.
Explanation:
The amino acids with POLAR and CHARGED side chains are expected to be observed on the membrane surface, whereas amino acids with NON-POLAR and HYDROPHOBIC side chains are expected to be found inside the lipid bilayer.
The lipidic bilayer is mainly composed of phospholipids.Phospholipids have hydrophilic, polar phosphate heads facing out on each surface to interact with water and hydrophobic fatty acid tails facing each other inside the lipid bilayer.The polar and charged side chains of amino acids are expected to be observed on the surface of membrane proteins because they can interact with water (H2O) molecules.On the other hand, nonpolar side chains of specific amino acids are expected to be observed inside the lipid bilayer to interact with the hydrophobic fatty acid tails of phospholipids.The polar amino acids include glutamine, glutamic acid, arginine, asparagine, aspartic acid, histidine, lysine, serine, and threonine.Moreover, amino acids with hydrophobic side chains include leucine, isoleucine, glycine, alanine, valine and proline.In conclusion, amino acid residues with POLAR and CHARGED side chains are expected to be observed on the membrane surface, whereas amino acids with NON-POLAR and HYDROPHOBIC chains are expected to be found inside the lipid bilayer.
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I need help can someone help me please?
Answer:
The answer is A
Explanation:
What is exocytosis?
The process by which a cell engulfs a large particle or another cell, eating it
Pressure that a fluid exerts against a structure that contains it
The process by which a cell takes in a small amount of extracellular fluid and its contents by the ballooning inward of the plasma membrane
The process by which a cell expels the contents of an internal vesicle to the extracellular fluid
There is a healthy bacterial culture growing in the exponential phase . A technician wants to make a growth curve by making cell counts over the day . She plans to take the samples every 30 minutes during the day , hold the samples at room temperature , and then process all samples together at the end of the day .
A) what is the problem with her plan?
B)can she do anything to improve the accuracy of her results ?
A) WHAT IS THE PROBLEM WITH HER PLAN?
Binary fission is one of the asexual process by which most bacteria reproduce, the binary fission brings about a doubling of the number in bacterial cells that are viable.
Generation time is that time that it will require for a cell population to divide and double, it is also known as doubling time. This Generation time varies among distinct organisms and also varies among culture conditions.
Take for instance,a fast growing bacterium that is under an ideal culture conditions has a doubling time of 20minutes and for the bacteria that is grown in a condition that is not so ideal,may have a doubling time of hours.
The major challenge/ problem with her plan is that as she takes the bacterial sample every 30minutes, and then hold the sample till the last sampling is done in the day,those bacterial cells that are collected in the initial intervals will then get divided and further gives a result that is false.
However,if those bacteria that are collected aren't stored in a culture environment that is standard,the bacterial cells may die off and thus will further bring about a false result.
2) CAN SHE DO ANYTHING TO IMPROVE THE ACCURACY OF HER RESULT?
Solution for rectifying the error in her plan;
She can go ahead and add 50-100 μl of formaldehyde to all the culture suspensions that she has and has taken every 30minutes.
As the formaldehyde will fix the bacterial cells,The optical density present in all those aliquots can then be retrieved/taken at the end of the day.
Looking at it alternatively, aliquot 1ml of the culture suspension at an interval of every 30 minutes,and then take the optical density that is OD at a wavelength of 600nm making use of spectrophotometer until the reason you get becomes static.
In facilitated diffusion, do molecules move down their concentration gradient? Explain.
Answer:
Molecules move up the concentration gradient in facilitated diffusion, which requires ATP to be used as molecules naturally move from high to low concentration
Explanation:
: )
Molecules move down their concentration gradient in facilitated diffusion through channels of proteins.
For most molecules, movement through the membrane, with a significant rate, is only possible by the presence of transporter proteins (integral membrane proteins, which recognize substances with a high specificity, accelerating their translocation) or channels of proteins.
Transport proteins allow the facilitated diffusion of molecules, moving them along the free energy gradient (concentration gradient, charge gradient, or both), in the direction of thermodynamic equilibrium.
When a carrier protein binds to a solute, the protein changes shape in such a way that it carries the solute to the other side of the membrane.
Facilitated diffusion is similar to simple diffusion, since the molecules move from a region of higher to a lower concentration of solutes.
For example, by facilitated diffusion, chlorine ions move down their concentration gradient into the cell through chlorine channels.
Therefore, we can conclude that many molecules are assisted by transporter proteins for their diffusion through the plasma membrane, a process known as facilitated diffusion, where the molecules descend through their concentration gradient.
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The reaction shown below is known as what type of reaction?
Reactants → Products + Heat
А. activation
B. endothermic
c. enzymes
D. exothermic
a metacentric chromosome is one that has a centrally located centomere and chromosome arms with approximately equal length. which of the human chromosomesare metacentric
Answer:
Human chromosomes 1 and 3
Explanation:
There are four types of chromosomes classified based on the position of their centromere. These chromosomes are metacentric, submetacentric, acrocentric and telocentric. As rightly stated in this question, metacentric chromosome is the chromosome that has a centrally located centomere making the chromosome arms to be approximately of equal length.
The metacentric type of chromosomes are present in humans as viewed using KARYOTYPE (a pictorial display of chromosome arrangement). Based on karyotyping, chromosomes 1 and 3 are METACENTRIC.
What effect does development, through erecting buildings and concrete pavement, have on the recharge of aquifers and the quality of the water?
Answer:
Infiltrate rate decreases and also water quality.
Explanation:
There is adverse effect of erecting buildings and concrete pavement on the recharge of aquifers and the quality of the water because the water is unable to infiltrate inside the soil due to concrete floor and the recharging of aquifers is not possible. These buildings and concrete pavements also reduces the quality of water due to degradation of sediments present in the building with the passage of time.
PLEASE HELP ME WITH THIS QUESTION
How can we conserve energy and instead of wasting energy?
Answer:
Adjust your day-to-day behaviors.
Replace your light bulbs.
Use smart power strips.
Install a programmable or smart thermostat.
Purchase energy efficient appliances.
Which is greater 1,000 ml or 1,000 cm?
Answer:
Neither, they are equal.
1,000 cm3 = 1000 mL
What conditions must be ideal for an enzyme to function?
The conditions for an enzyme to work properly would be around a specific temperature & pH ranges.
Higher temperatures (heat) would speed up the functioning of the enzyme while lower temperatures (cold) would do the opposite..
How many cycles of β oxidation are required for the complete oxidation of activated oleic acid, 18:1(9)?
Answer:
The answer is "8 beta-oxidation cycles".
Explanation:
Please find the complete question in the attached file.
In this complete oxidation of active oleic acid 18:1(Δ9), 8 beta-oxidation cycles are required. Oleic acid is saturated fat, 9 to 10-carbohydrate fatty acid. Its double bonding is cis-focused. Its cycles for beta-oxidation required to oxidize an active oleic acid fully are 8.
It's initial two fatty acids are removed by oxidation in β - oxidation from the initial two carbon atoms. The recently formed carbon units are made up of creating temporary A molecules (acetyl- CoA). That cycle for oxidative begins with both the coffee grounds terminals of the fat lactone chain.
What would be the best control group for global warming? Select one: (A)laboratory simulation,(B )a computer simulation or (C) another identical earth that has not seen increases in greenhouse gases (even though this is not possible)
Answer:
C. another identical earth that has not seen increases in greenhouse gases
The best control group for global warming would be another identical earth that has not seen increases in greenhouse gases.
What do you mean by Global warming?Global warming may be defined as the gradual increase in the Earth's average temperature due to the trapping of greenhouse gases by the atmosphere.
The excessive release of greenhouse gases like methane, Carbon dioxide, nitrous oxide, and ozone are responsible for global warming. These gases are released by automobiles, industrial smoke, etc.
Deforestation is also considered the cause of global warming. Trees help in the reduction of carbon dioxide from the atmosphere and convert it into oxygen.
Therefore, the best control group for global warming would be another identical earth that has not seen increases in greenhouse gases.
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9. A pattern of stars that has been named is called a constellation. One winter evening, Jason
found the star called Sirius in the constellation called Canis Major.
Canis Major
Sirius
Muliphen.
Murzim
Wezen
Aludra
Adara
If Jason came outside again a few hours later, what would the stars in Canis Major look like?
A. The pattern of stars would appear to be in the same place in the sky.
B. The pattern would change because each star would have moved in a different direction.
C. The pattern of stars would appear to have moved together across the sky.
D. The pattern would be smaller because the stars moved closer together.
Answer
i think its C.
One of the key elements in creating a green economy is the construction of ________________.
a.
green buildings
c.
solar panels
b.
a new tax system
d.
a new workforce
Answer:
A One of the key elements in creating a green economy is the construction of green buildings.
Explanation:
Any economy relies on businesses and buildings, so a green economy is going to need green buildings to support a green economy as well.
A depiction of the MAPK/ERK signaling pathway that leads to cell growth is shown in the image.
What would be observed if a carcinogenic compound in coal tar activated step 3 of the pathway, even in the absence of the signaling molecule?
A) The transduction molecules in step 5 would always be active.
B) Step 2, the step linking the receptor to transduction, would always be active.
C) Step 4, a transduction step, would be prevented from activating the target protein.
D) The transcription factor in step 6 would be prevented from transcribing the target genes.
Answer:
a
Explanation:
I am pretty sure its a
Which two pieces of equipment did the geologist most likely use to determine the density of the copper nuggets?
The most important structure in the lower respiratory tract is the alveolus.
O True
O False
Answer:
true
Explanation:
the lower respiratory tract contains:- trachea, bronchial tree, and lungs.
Which sentences describe the differences between photosynthesis and cellular respiration? Check all that apply. Cellular respiration uses oxygen as a reactant and photosynthesis does not
Answer:
Cellular respiration uses oxygen as a reactant and photosynthesis does not
Explanation:
Autotrophs use CO2 to make energy while heterotrophs use Oxygen.
Check all that apply?You only gave one option so that's as far as I can get, sorry!
2. Running water can be used as an energy
source to produce _____
power.
running water can be used as an energy source to produce hydroelectric power.
pls helppppoooopppppoppppp
Answer:
direct observation
Explanation:
NEED HELP RLLY BAD
where are excessive ketones normally seen in a test?
1. blood
2. urine
3. saliva
10.
_________produces pollens and______
develops into the fruit.
Answer:
stamen produces pollen ovules develops into fruit
Explanation:
You and your friends go to the beach for vacation. You all walk down to the beach to go swimming. When you get there, you see the water is murky and green, and there are algae blooms floating on top. If it is excess nutrients which are feeding the algae blooms and lowering the oxygen content in the water, that process is called:_______.a. nutrient cycling.
b. nitrification.
c. eutrophication.
d. hypoxia.
Answer: The process is called EUTROPHICATION. The correct option is C.
Explanation:
Eutrophication is a type of environmental pollution where by there is an increase in nutrient salts of a water body which can lead to structural changes in the affected aquatic ecosystem. These changes includes:
--> Increase in production of algae: this effect causes algae blooms which makes the water murky, greenish and unpleasant for certain activities such as swimming.
--> Decrease in aquatic life: the presence of excessive growth of algae which are often degraded by microorganisms. When the rate of degradation of the algae by microorganisms is greater than that of oxygen regeneration a hypoxic state occurs which is harmful to aquatic life example fishes.
Which organelle makes energy for the animal cell?
A. mitochondria
B. chloroplasts
C. chromatin
D. golgi apparatus
Answer:
A. mitochondria
Explanation:
The mitochondria makes energy for the animal cell. The mitochondria organelle is known as the "power house of all cells". It makes energy for the cell.
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Explain one way the water cyce affects weather.
Answer:Consequently, the temperature will fall. Rainfall and snow are results of water cycle and can lead to severe weather conditions. Excessive rainfall due to water cycle can cause floods. Extremely low rainfall, lack of adequate water sources can lead to draught in a given region.
Explanation:
the diagram below is a model that shows structural organization within a multicellular organisms. why is "tissue" listed between cell and organ?
Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago?
Answer:
The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).
Explanation:
Which type of mining is likely the least harmful to the environment?
a. surface mining
b. placer mining
c. subsurface mining
d. none of the above
Answer:
Placer mining
Explanation:
Placer mining can be less damaging to the environment than surface mines, as the sediment is returned to the water after the minerals have been extracted.
The mining that is likely the least harmful to the environment is the placer mining that is present in Option B, water is used in placer mining to separate mineral particles from soil.
What is placer mining?Placer mining involves the extraction of minerals from riverbeds, streambeds, and other bodies of water, and this method involves the use of water to separate mineral particles from soil, while placer mining is generally considered to be less harmful to the environment compared to surface and subsurface mining, but it can still have negative impacts if not properly managed. For example, the use of mercury in the gold extraction process can lead to water pollution and harm to aquatic life.
Hence, the mining that is likely the least harmful to the environment is the placer mining that is present in Option B.
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Red blood cells are able to maintain homeostasis because they are bathed in blood, which is to the fluid in the cells themselves.
Answer:
this is not a question it is a statement
Explanation: