Calculate Density: Mass = 79.4g
Volume = 29.8 cm
Density = ?
Answer:
2.66 g/cm
Explanation:
Mass=100g
Volume=100mL
[tex]\\ \rm\longmapsto Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \rm\longmapsto Density=\dfrac{79.4}{29.8}[/tex]
[tex]\\ \rm\longmapsto Density=2.66g/mL[/tex]
A small generic section of the primary structure of an alpha helix is given below
-amino acid1-amino acid2-amino acid3-amino acid4-amino acid5-amino acid-6-amino acid7-
A) Which amino acid residue's backbone forms a hydrogen bond with the backbone of the seventh(7th) residue?
B) which of the following peptide segments is most likely to be part of a stable alpha helix at physiological pH?
A) -Lys-Lys-Ala-Arg-Ser-
B) -Gly-Arg-Lys-His-Gly-
C) -Pro-Leu-Thr-Pro-Trp-
D) -Gly-Gly-Gly-Ala-Gly-
E) -Glu-Glu-Glu-Glu-Glu-
F) -Glu-Leu-Ala-Lys-Phe-
G) -Tyr-Trp-Phe-Val-IIe-
Answer:
The correct answers are "amino acid3" and option F) "-Glu-Leu-Ala-Lys-Phe-"
Explanation:
The alpha helix is one the most common secondary structures of proteins, characterized by seven residue repeating units that alternate hydrophobic and hydrophilic residues. This sequence match with the peptide segment "-Glu-Leu-Ala-Lys-Phe-", where glutamic acid (Glu) is hydrophilic, leucine (Leu) is hydrophobic; and it does not contain amino acids that disrupt alpha helix such as proline and glycine. The alpha helix structure is stabilized by hydrogen bonds within the residue's backbone, one of them stablished between the third and the seventh amino acid residues.
Which three of the statements are true? Amphipathic (amphiphilic) lipids are the structural basis of biological bilayer membranes. The tendency of water to minimize its contact with nonpolar substances is called the hydrophobic effect. Hydrophobic molecules do not readily dissolve in water in part because water molecules involved in hydration cannot participate in normal hydrogen bonding with one another. Hydrophobic molecules are individually hydrated in water, increasing the entropy of the system. Nonpolar molecules are capable of forming micelles.
Answer:
- Amphipathic (amphiphilic) lipids are the structural basis of biological bilayer membranes.
- The tendency of water to minimize its contact with nonpolar substances is called the hydrophobic effect.
- Hydrophobic molecules do not readily dissolve in water in part because water molecules involved in hydration cannot participate in normal hydrogen bonding with one another.
Explanation:
The cellular membranes consist of amphipathic lipids arranged in a bilayer, which maximizes both hydrophobic and hydrophilic interactions. The hydrophobic effect can be defined as the propensity of non-polar substances to aggregate themselves and thus exclude water molecules in a solution. Thus, water molecules around non-polar residues form an arrangement that reduces the entropy. Non-polar molecules are repelled and do not dissolve in water, thereby maximizing hydrogen bonding between water molecules and minimizing the contact area between water and nonpolar molecules.
Who observed variations in the characteristics A.James Hutton , B.Charles Lyell , C.Charles Darwin, D.Thomas Malthus
Answer:b
Explanation:
The pH of blood is not affected by: ______a. hyperventilation.b. the pKa of acetic acid or acetate. c. consuming large amounts of sodium bicarbonate.d. fasting and starvation.
Answer:
The correct option is the pKa of acetic acid or acetate.
Explanation:
The blood pH is affected by hyperventilation since it triggers hypercapnia, an increase in metabolic acids and therefore a decrease in blood pH.
Excessive consumption of sodium bicarbonate, since this would alkalize the blood, and finally, prolonged fasting or excessive hunger generates the degradation of fat sources, with the consequent formation of ketone bodies as a product, and therefore entering a metabolic acidosis.
Corals form symbiotic relationships with microscopic photosynthetic algae that live in their cells and give the corals their distinct colors. The relationship is an example of mutualism, in which both species benefit. Predict how each organism in this relationship could benefit the other.
Answer and Explanation:
Corals are translucid or white, but they look brightly colored because they host symbionts with colorful photosynthetic pigments . They can host different organisms that live on and among them, giving place to an amazing ecosystem.
One of these organisms is the photosynthetic unicellular microalgae, called zooxanteles, that are colorful and provide nutrients to the coral.
Corals provide shelter and protection to the algae, while algae provide nitrogenated nutrients, sugars, and color to the corals. Algae can store nitrogen in their tissues as nitrogen-rich crystals, which are constantly provided to corals.
This symbiotic relation allows corals to grow in different environments that are poor in nitrogen or other nutrients, such as the tropical clear waters.
When changes in radiation, temperature, or salinity in water occur, corals react to these changes losing these algae and becoming translucid again.
what is the name of a process that produces use to make their own food
Answer:
photosynthesis
Explanation:
I'm not sure you're being clear but I think this is the answer.
Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose.
Question 7
Bacteria are prokaryotes which means they don't have membrane bound organelles or an organized nucleus.
True
False
Answer:
F
Explanation:
T
Answer:
The correct answer is False
Explanation:
What role do white blood cells preform in a human body?
A. Clotting blood
B. Conducting electrical impulses
C. Secreting enzymes
D. Carrying oxygen
Answer:
A-Clotting blood
Explanation:
Which group contains only organs in a human body?
3
heart, brain, skin
skin, blood, neuron
neuron, heart, stomach
stomach, blood, brain
heart, brain, skin are the group contains only organs in a human body. Thus option A is correct.
what is role of heart ?
The major function of heart in our body is to pumping blood from the lungs to different the body parts.
In the initial step the de-oxygenated blood collected in the right atrium and pumped to the lungs via the right ventricle through a valve called tricuspid valve.
After carbon dioxide exhalation, the pure re-oxygenated blood is collected in the left atrium moved to the left ventricle via the mitral valve then transfers to the body parts.
The transportation of blood from the right atrium to the right ventricle occurs via the pulmonary semilunar valve.
Now the pulmonary vein carries the oxygenated blood and reach the left atrium transported to left ventricle followed by aortic semilunar valve transports this blood from the left ventricle to the aorta then to capillaries.
Thus option A is correct.
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In amphibians, air is forced into the lungs, not drawn into the lungs; this is called:___________.
Answer:
The options are
A) negative pressure breathing
B) forced air breathing
C) positive pressure breathing
D) terrestrial breathing
E) none of the above
The answer is C) positive pressure breathing
Explanation:
Mammals such as humans and goats possess diaphragms . The muscles of the diaphragm create a type of pressure which helps in pulling air into the lungs. This process is called Negative pressure breathing.
Amphibians lack diaphragms so they lack pressure to draw air into the lungs , it is forced into the lungs instead in a process known as positive pressure breathing.
3. Los conductos linfáticos, a medida que se alejan de los tejidos corporales:
a- Se hacen más angostos.
b- Se hacen más anchos.
c- Permanecen del mismo tamaño.
d- Se pierden.
Answer:
b- Se hacen más anchos.
Explanation:
Los conductos o vasos linfáticos son tubos que transporta tanto al líquido linfático (linfa) como glóbulos blancos que fluyen a través del sistema linfático. Estos conductos se inician en el intersticio y terminan en conductos de mayor tamaño que desembocan en la base del cuello, entre las venas yugular interna y la subclavia. A medida que va entrando en los tejidos, los conductos linfáticos se van haciendo cada vez más angostos y finos, convirtiéndose finalmente en capilares linfáticos, donde las sustancias que no pueden penetrar los vasos sanguíneos son recogidas por estos capilares.
Which of the following organic molecules is used for chemical digestion?
Answer:
glucose molecules
Explanation:
Beetles come in a wide variety of shapes, feeding habits, and live in a variety of habitats. Classifying beetles can be quite difficult given their sheer numbers. Within the Ground Beetles in Genus Notiophilus alone there are 15 different species. If you were to choose a group of organisms the LEAST related to individuals in this genus, you would look in which of the following taxa? In the same Kingdom, but not the same Phylum In the same Domain, but not the same Kingdom In the same Class, but not the same Order In the same Family, but not the same Genus
Answer:
In the same Domain, but not the same Kingdom
Explanation:
The taxonomic classification is organized in the following taxes, following the order of greatest kinship to the order of lowest biological kinship: species, genus, family, order, class, phylum, kingdom and domain. Therefore, if you want to study organisms that are less genetically similar to the organisms that make up the genus Notiophilus, you should observe the individuals that make up the domain where this genus is inserted, since they have very little genetic and morphological similarities.
create a flowchart of the negative feedback mechanism that controls your body’s temperature
Answer:b) Body temperature is regulated by negative feedback. The stimulus is when the body temperature exceeds 37 degrees Celsius, the sensors are the nerve cells with endings in the skin and brain, the control is the temperature regulatory center in the brain, and the effector is the sweat glands throughout the body.In negative feedback, the body works to correct a deviation from a set point, it tries to get back to normal. ... In positive feedback, the body changes from the normal point and amplifies it. Examples include blood clot formation, lactation, contractions during childbirth, and fever.In positive feedback mechanisms, the response to a stimulus does not stop or reverse it but instead keeps the sequence of events going up. ... A positive feedback mechanism can be harmful, as in case of fever that causes metabolic changes pushing it to be higher.xamples of processes that utilise negative feedback loops include homeostatic systems, such as:
Thermoregulation (if body temperature changes, mechanisms are induced to restore normal levels)
Blood sugar regulation (insulin lowers blood glucose when levels are high ; glucagon raises blood glucose when levels are low)
Explanation:
TRUE OR FALSE
The atmosphere is a relatively thin layer of gases that form Earth’s outermost layer.
Mountains are an example of the biosphere.
The crust is less than 1% of the Earth’s mass.
Ponds are an example of the geosphere.
Earth’s four systems include: geosphere, atmosphere, biosphere, and lithosphere.
Answer:
true, true, false (15%), false, true
Describe how replacing diesel/petrol fueled vehicle to electric-operated vehicles may change the environment
Answer:
By reducing the amount of carbon dioxide emissions contributing to global warming
Explanation:
Global warming is an arising problem caused by the emission of gases called GREENHOUSE GASES into the Earth's atmosphere. The greenhouse gases include Carbon dioxide, methane etc.
Carbon dioxide as the principal cause of global warming is emitted when fossil fuels like petroleum products like diesel or petrol are burned. Therefore, the use of automobiles like cars releases CO2 into the atmosphere. Therefore, replacing diesel/petrol fueled vehicle to electric-operated vehicles may change the environment by reducing the amount of greenhouse gases (CO2) emitted into the atmosphere, ultimately helping to reduce global warming.
According to the excerpt above from a health journal, what decision can an athlete make regarding his diet?
A. His diet should include foods such as eggs, nuts, and fish.
B. He should eat a diet high in carbohydrates to form large muscles.
C. He should increase the amount of time he works out to produce red blood cells.
D. He should get an extra hour of sleep each night to increase protein production.
The correct answer is A. His diet should include foods such as eggs, nuts, and fish.
Explanation:
The excerpt from the journal explains the importance of protein intake for athletes as this contributes to many body functions such as "enzyme production" or "growth and repair of tissues". In this context, athletes will need to have an appropriate protein intake, which is essential to growth muscles or repair them if there is a lesion. Moreover, this can be obtained through the intake of foods such as eggs, nuts, fish, grains, among others. In this context, the best decision is expressed in option A.
Which of the following can digest an enzyme?
a. Proteases
b. Kinases
c. Lipases
d. Endonucleases
Answer:
Endonuclease can digest an enzyme.
Enzymes can be digested by option a. Proteases among the given options as it is an enzyme that can digest proteins and peptides.
Enzymes are proteins that can catalyze biochemical reactions by accelerating the reactions. Proteins are made up of polypeptide chains.
Protease is an enzyme that can cleave or degrade the peptide bonds present in the enzyme that helps in the digestion of the enzymes.Kinases phosphorylate other molecules The endonuclease degrades DNA into fragments. Lipases are the enzyme that that digests the lipid moleculesThus, the correct answer is option a. Proteases.
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What is the cell membrane’s function
Answer:
Perhaps its main task is to regulate the entry and exit of particles into and out of the cell.
Which of the following things is a product of science?
A. Singing
B. Modern bananas
C. Astrology
D. Basket weaving
Answer:
b. modern bananas
Explanation:
Science is a discipline which is based upon the study of the natural world on the basis of the facts and data obtain after the experimental trials and associated observations. Fields of scientific study includes biology, physics and chemistry.
Modern bananas is the product of science as it can be composed or constructed by using the knowledge of science and associated technology.
B. Modern bananas are a product of science.
Are modern bananas man-made?The modern-day, not unusual banana is a person-made hybrid of the wild Musa acuminata and Musa balbisiana banana species. Musa acuminata has a fleshy inside, however, it has a very unsightly flavor. Musa balbisiana has a nice-tasting inside but consists of too many seeds. each banana is naturally crossbred in the forests of South Asia.
Much like human beings, bananas are dealing with a pandemic. Nearly all the bananas bought globally are just one type known as the Cavendish, that's at risk of a deadly fungus called Tropical Race 4, or Panama disease. If not stopped, Tropical Race 4 ought to wipe out the $25 billion banana enterprise.
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Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep constant for each object after the objects collide and bounce apart?
velocity
mass
momentum
direction
Answer:
mass
Explanation:
The law of conservation of momentum states that within an isolated system, one of the quantities must be conserved no matter what happens. In the case of the question above, when two objects collide and separate from each other. Because of the collision and the removal of objects, it is not possible to keep the direction and speed that they assume constant. However, the mass of the bodies will be maintained at all times, before, during and after the collision; steadily.
The only parameter Jerome should keep constant is mass of the object.
Law of conservation of momentumThe law of conservation of momentum states that, the total momentum of an isolated system is always constant.
The formula for law of conservation of momentum is written as;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where;
m is mass u is initial velocityv is final velocityThus, the only parameter Jerome should keep constant is mass of the object.
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An RNA molecule is made up of long chains of nucleotides. An RNA nucleotide consists of a _______________, a
_______________, and a nitrogenous base.
The comparatively brief, single-stranded adenine, cytosine, guanine, and uracil-based mRNA molecules are bound together by a sugar phosphate backbone. Two thirds RNA and one third protein make up the enormous and intricate ribosome.
What are the composition of RNA molecule?Ribonucleic acid is a substance that is present in the majority of living things, including viruses (RNA). The building blocks of DNA are nucleotides, which are ribose sugars bound to nitrogenous bases and phosphate groups.Adenine, guanine, uracil, and cytosine are among the nitrogenous bases.
Similar to our prior findings for bacteria, we discover that each gene typically only has a small number of mRNA molecules present in the cell at any given time.
Therefore, An RNA molecule is made up of long chains of nucleotides. An RNA nucleotide consists of a (five carbon ribose sugar) , a( phosphate molecule ) and a nitrogenous base.
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During the cell cycle, the cell must pass through several checkpoints that confirm that the cell is ready to progress to the next phase of the cycle. If the requirements of one phase have not been met, the cell cannot proceed to the next phase. These checkpoints help control the rate of cell division. If a mutation disables one of these checkpoints, what is most likely to happen
Answer:
The correct answer would be - Cells begin dividing faster, leading to cancer.
Explanation:
In the process of the cell cycle, there are several checkpoints that ensures that the cell is all set to move to next phase, the cell that not match the requirements cell have not move to next phase.
These checkpoints control the rate of cell proliferation or division and if a dividing cell fails to pass through any checkpoints due to the mutation, it is most likely divide uncontrollably and lead to cancerous or tumor cell.
Thus, the correct answer is - Cells begin dividing faster, leading to cancer.
g A graduate student ran a gel filtration column and determined that a specific protein has a molecular mass of 400 kDa. The student then ran an SDS-PAGE gel of the protein under non-reducing conditions and found the presence of three bands: 180, 160, and 60 kDa. The student then ran SDS-PAGE under reducing conditions and still found three bands but the sizes were: 160, 90, and 60 kDa. Explain (1) the subunit composition of the protein, (2) the number of unique and identical polypeptides present in a single protein, (3) and why the discrepancies occur in the molecular weights.
Answer:
1) The protein is a tetramer, i.e., it has 4 subunits
2) The protein has two identical subunits with a molecular weight of 90 kDa
3) Because this protein contains two subunits with identical molecular weight (90 + 90= 180)
Explanation:
160 kDa + 90 kDa + 60 kDa = 310 kDa >>
Subunit X = 400 kDa - 310 kDa = 90 kDa >> Two subunits with a weight of 90 kDa likely linked by disulfide bonds (i.e., non-reducing conditions can break all bonds except sulfide interactions)
A rapid change in temperature with depth is known as a
A. thermocline
B. halocline
C. temperocline
D. pycnocline
is a tank full of gasoline potential or kinetic?
Explain why the tree which does not move away is also considered a living thing
Answer:
Because it grows. Anything having to do with growth is alive.
There is a theory that gravity Eould pull galaxies back together, causing a reverse big bang Which observation makes this theory less likely than the idea that the universe may continue to expand? Background radiation is present, Galaxies exist outside of the Milky Way. The expansion of the universe is accelerating Gas giants form farther from the Sun, where temperatures are cooler.
Answer:
Explanation:
The correct answer is derived from Hubble's observation that galaxies that are further away from the sun are moving away from our sun at a rate that is greater than those that are close by.
This observation suggests that our universe is expanding.
Now which choice best fits this observation? I don't know that this answer is correct, but it might be the closest choice. Galaxies exist outside the Milky Way, but that answer does not take into account their motion which is a necessary part of the theory.
Answer: The expansion of the universe is accelerating
Explanation: Edge test
DOES ANYONE KNOW THE ANSWER??? picture above only if you know it
Answer:
I believe it's the first option
