Explanation:
During photosynthesis, light energy converts carbon dioxide and water (the reactants) into glucose and oxygen (the products).
Some of the smallest cells in the human body are red blood cells. They make up nearly half the volume of blood. A typical red blood cell is 8 µm across. The largest artery that blood flows through is the aorta, which is about 20 mm (2 cm) across. How many red blood cells would fit side-by-side across the aorta? Show your working.
Answer:
[tex]$1.6 \times 10^{-3}$[/tex]
Explanation:
Given data :
Size of a typical red blood cells = 8 µm
= 0.0008 cm
The size of the largest artery through which the blood flows, known as aorta
= 20 mm
= 2 cm
Thus the number of the red blood cells that would fit side by side across the aorta would be = 2 cm x 0.0008 cm
= [tex]$1.6 \times 10^{-3}$[/tex]
ways in which soil organisms such as earth worms improve soil fertility
Answer:
by eating organic matter in the soil and excreting castings that are rich in nitrogen, phosphorus, and potassium which make the soil nourishing.
Which would make for a weak claim?
• a blog cited as the source
• a large sample size
• clear variables and controls
• multiple trials
Answer:
A
Explanation:
Blogs can have a lot of misinformation
Place the steps shown below in the correct order.
2.3.1.5.4
2.1.3.4.5
04.1.3.5.2
1.3.4.5.2
2.4.3.1.5
Answer:
option 2. 2.1.3.4.5
Explanation:
This is the accurate answer... that is the correct steps of mitosis
what are chromosomes
A. strands I'd DNA wrapped around proteins.
B. The alleles that cause certain traits.
C. Any organism that cause contains DNA
D. A form of virus that infects cells.
Answer:
A. strands I'd DNA wrapped around proteins.
Explanation:
DNA is securely packed within the nucleus by chromosomes, which are thread-like structures. Histone proteins offer structural support for DNA by coiling it around them. During cell division, chromosomes assist in the replication and distribution of DNA. Each chromosome has a centromere, which separates the p (short) and q (long) arms. The centromere is found at the constriction point of the chromosome, which may or may not be the center.
OAmalOHopeO
The flash patterns of fireflies attract mates of their own species. What type of reproductive isolation is this an example of?
describe the structure of DNA and how it can be extracted from plant cells?
Explanation:
DNA can be extracted by grinding the tissue in dry ice or liquid nitrogen with the mortar and pestel or a food grinder. the cell membrane must be disrupted,so that the DNA is released into extraction buffer.
Plant cells are eukaryotic cells that make up plant tissues and have three types of DNA: nuclear, mitochondrial and chloroplastic, for their study, nucleic acids must be isolated by physical or chemical methods.
What are plant cells?They are eukaryotic cells that make up many of the tissues of organisms belonging to the Plantae kingdom, have a differentiated nucleus, contain hereditary genetic information (DNA) and can be nuclear, mitochondrial and chloroplastic.
The extraction and purification of nucleic acids constitutes the first stage of plant cells studies, the DNA precipitates in alcohol out of solution, where it can be seen and separates it from other cellular components, which are left in the aqueous solution.
Therefore, we can conclude that plant cells are eukaryotic cells that make up plant tissues and have three types of DNA: nuclear, mitochondrial and chloroplastic, for their study, nucleic acids must be isolated by physical or chemical methods.
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While you and your little cousin are walking through a natural history museum, she points out the skull of an australopithecine with a large crest on the top and asks you what its purpose was. How might you correctly sum up this complicated evolutionary trait for your little cousin
Answer:
The purpose of the crest was to provide a surface for masticatory muscle attachment or insertion.
Explanation:
This crest is called the sagittal crest. It is present in extinct hominids, such as Australopithecus and Paranthropus, and can also be found in living animals such as gorillas or lions and some reptiles.
The sagittal crest is a bony structure that crosses the hominids´ skull longitudinally, and it is so well-developed that it stands out notoriously.
This crest, like others in the skulls, provides an attachment surface for many muscles. In the particular case of the sagittal crest, it is believed to provide an insertion area to mastication muscles.
It seems that Australopithecus had a special diet composed of tough items. The hominid probably needed to strong bite while eating. The strong jow muscles gave them the possibility to bite but needed a wide area for insertion. The sagittal crest provided that wide surface. There was a direct relationship between the size of the crest and the muscle mass. The bigger the crest was, the more developed the muscle was.
It is believed that in living animals, such as gorillas, the development of the crest in males is for sexual selection and reproductive success. The bigger the crest is, the more attractive the male is, and the more chances to be selected by the female to mate it will have. Some hypothesize that the development of the crest in Australopithecus could also be related to sexual selection.
B cells respond to the initial antigen challenge by ________. forming of a large number of B cells and T cells that display surface antibodies different from the original B cell producing progeny cells that include plasma cells and memory cells with surface antibodies different from the original B cell forming of a large number of B cells and T cells that display surface antibodies identical to the original B cell producing pyrogens to initiate fever producing progeny cells that include plasma cells and memory cells with surface antibodies identical to the original B cell
Answer:
Producing progeny cells that include plasma cells and memory cells
Explanation:
B cells are essential cells in the constitution of the body's immunity. These cells are responsible for developing the so-called humoral immunity that is capable of neutralizing and destroying foreign substances that do not belong to the organism, that is, the B cells are capable of destroying antigens. To destroy the antigens, B cells start a production of descendant cells that are made up of plasma cells and memory cells.
Which method gives the actual age of a fossil in years?
Answer:
Radiometric dating methodsExplanation:
Researchers use a clock to estimate the date a rock or fossil was produced in order to ascertain its age. Radiometric dating methods, which are based on the natural radioactive decay of specific elements like potassium and carbon, are widely used by geologists to date ancient events.
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Which is one function of steroids
Steroids have a number of different functions but essentially all act as hormones in the body.
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
The answers are:
carrier proteins → charged amino acid
Carrier proteins are transmembrane proteins for the facilitated diffusion of charged amino acids across plasma membranes.
osmosis → water molecule
A type of passive transport, osmosis is the diffusion of water molecules in and out of cells.
active transport → calcium moves from low concentration to high concentration
This is the movement of substances across membranes against concentration gradient.
simple diffusion → oxygen
Oxygen molecules enter through membrane by simple diffusion from an area of high to low concentration.
exocytosis → proteins from the Golgi apparatus
This process of exocytosis is used by cells to release particles that has been packaged by the golgi bodies.
Explanation: Boom
Carrier Proteins is Charged Amino Acid, Osmosis implies to Water Molecule, Active Transport - Calcium moves from low concentration to high concentration, Simple Diffusion - Oxygen, and Exocytosis - Protein from the Golgi Apparatus.
In assisted diffusion, a type of transport in which charged amino acids or other molecules bind to particular carrier proteins in order to traverse the cell membrane, carrier proteins are involved.
The passage of charged amino acids through the membrane is aided by this mechanism.
Osmosis is the flow of water molecules over a membrane that is selectively permeable, caused by variations in solute concentrations.
The movement of substances against a gradient of concentration, usually from a region of lower concentration to one of greater concentration, is referred to as active transport.
In this instance, calcium ions are actively moved utilising ATP energy from low concentration to high concentration areas.
Simple diffusion is the gradient-driven passive migration of molecules from a region of higher concentration to a region of lower concentration.
Due to their small size and nonpolarity, oxygen molecules can freely diffuse through the cell membrane through simple diffusion.
Exocytosis is the process through which cells discharge big molecules, such proteins, to the exterior of the cell from the Golgi apparatus.
The proteins are contained in vesicles that join the cell membrane and discharge their contents outside of the body.
Thus, charged amino acid transport is facilitated by carrier proteins, water molecules are moved by osmosis, calcium is moved against its concentration gradient by active transport, oxygen is moved along its concentration gradient by simple diffusion, and proteins are released from the Golgi apparatus through exocytosis.
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Osteoporosis is a disease that affects the bones and leads to an increase in bone fractures. Osteoporosis is most likely
to be affected by which cycle?
Answer:
osteoporosis is most likely to be affected by phosphorus.
I hope this helps
What is the Constant of “which bait works best for a fly trap?”
Answer:
Mix scraps of meat (the older, the better) with something sweet. Lots of people swear by using rotten fish or shrimp, which probably work best because they smell so much. Bait for Fruit Flies: Use fruit (the riper, the better), apple cider vinegar, fruit juice, syrup, wine, beer, or any combination
The element with atomic number of 4 is
Answer:
Beryllium is the element with the atomic number 4.
Cross-contamination of food occurs when a. perishable foods are kept at room temperature for more than 2 hours b. a utensil contaminated with a microorganism from a previously handled food contacts a second food c. two or more food handlers work on the same food d. two or more microorganisms grow in the same food
ANSWER: B
explanation: from what I learned in culinary arts, this is kind of a trick question. Its not asking how foods can get contaminated, its asking how CROSS CONTAMINATION can occur. Cross contamination occurs in three ways think of it like this: food-to-food, equipment-to-food, and people-to-food. The answer has to be between B and C. But the answer is B, because the utensil is already contaminated and it is coming in contact with another food. The two or more food handlers working on the same food are not bringing anything contaminated into the situation. Unless they are contaminated (by they I mean their hands lol) then it cross contaminates but that's not it lol im 99% sure the answer Is B.
Cross-contamination of food occurs when two or more foods come into contact with each other, transferring microorganisms from one food to another. This can happen in a number of ways, including direct contact, contact with a contaminated surface or utensil, contact with a contaminated food handler, or contact with airborne microorganisms.
What is the most common type of cross-contamination ?The most common type of cross-contamination is direct contact, which can occur when one food touches another. This is especially true of perishable foods, which should not be kept at room temperature for more than two hours.
If they are kept at room temperature longer than this, bacteria and other microorganisms can quickly multiply, potentially leading to cross-contamination.
Another common way for cross-contamination to occur is through contact with a contaminated surface or utensil. If a utensil that has been used to handle a food contaminated with microorganisms comes into contact with a second food, the microorganisms can transfer to the second food and cause cross-contamination.
Similarly, if two or more food handlers work on the same food, their hands can transfer microorganisms from one food to another, leading to cross-contamination. Finally, if two or more microorganisms grow in the same food, they can interact with each other and potentially cause cross-contamination.
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Passive transport:
requires ATP.
appears to stop when equilibrium is reached.
contains molecules which move up the concentration gradient.
requires protein channels.
Answer:
Passive transport requires protein channels
Explanation:
What is the function of the enzyme RNA polymerase during transcription?
aids in packaging amino acids for use at a later time
aids in destroying the mRNA sequence that was read
helps speed up the process of transcription
helps slow down the process of transcription
Answer:
RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, duyring the process of transcription.
IC What will be the difference in liquid pressure on their bases if bo B are filled with water completely but one of them is kept in Lumbini and another in Pokhara? Why?
Explanation:
Answer: Explanation: A will have more pressure in its base and B will have pressure half of A if they are kept in same place. ... B will have more liquid pressure because the density of the salty water is greater than the water.Oct 13, 2020
Drag each label to the correct location.
Sort the questions based on whether they are testable.
How do customers feel about
the services of airlines?
Do polluta
Answer:
airlines - nontestable
pollutants- Testable
chocolate- Testable
meat- Nontestable
Explanation:
i just took the test nd got it right
how many animals has 8leg
Answer:
It seems arachnids are the only animals with 8 legs. Octopuses may appear to have 8 legs, but 6 of them are actually arms and therefore do not count.
Explanation:
Arthropods include such animals as insects, spiders, ticks, centipedes,millipedes, crayfish, lobsters, mites, and scorpions. One class of arthropodsis the arachnids which include spiders, scorpions, and mites. Spiders have two main body parts and eight legs. Insects make up another class of arthropods.
what is the final product of tranlation
Answer:
polypeptide
Explanation:
The amino acid sequence is the final result of translation, and is known as a polypeptide. Polypeptides can then undergo folding to become functional proteins.
what is pre. existing cell.
Answer:
hey, here is your answer mate..!
Explanation:
All known living things are made up of one or more cells. All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms.
hope it helps mark as brainlist please
Answer:
The third part of the cell theory definition states that all cells come from preexisting cells. This means that cells don't just appear out of thin air (known as “spontaneous generation”). New cells are always made from current cells.
A change in the water availability of an area made it lose certain species, reverting the area to an earlier serial stage. Which of the following is described by this scenario?
Answer:
Ecological succession.
Explanation:
Ecological succession occurs in this scenario because the area is changing again to its original or starting stage due to change in its environmental conditions. Those plants that needs large amount of water will vanished and those plants that needs less water will take the place of that plants. This phenomenon also occur with other animals that living in that ecosystem.
Please help 10 points for answers!!
Answer:
1=65
2=50
3=true
Explanation:
Explain how the changes in the villi of a person with coeliac disease may cause the person to lose weight and have low amounts of vitamins and minerals in their body
Answer:
The changes in the villi of a person with coeliac disease may cause the person to lose weight and have low amounts of vitamins and minerals in their body because Villi absorb vitamins, minerals and other nutrients from the food you eat.A eukaryotic cell carries out phagocytosis and engulfs a gram-negative bacterial cell, which ends up in the resulting food vacuole. Hypothetically, to go from the cytosol of this bacterial cell to outside of the eukaryotic cell that has taken it in, what is the least number of biological membranes that would have to be crossed
Answer: 3
Explanation:
Lysozyme and the food vacuole are both membrane bounded organelles. Then to go out of the eukaryotic cell, it has to pass through the cell membrane
What does the Hardy-Weinberg principle relate to?
Answer:
The Hardy-Weinberg equilibrium is a principle stating that the genetic variation in a population will remain constant from one generation to the next in the absence of disturbing factors.
Explanation:
C What is the important of making prority
Answer:
Priorities will guide you in life's decisions and keep you on track. Most importantly, priorities will give you the confidence to say "no." They help you identify what's truly needed in your life, versus what someone else feels is important.
Answer:
The importance of it are Establishing priorities is necessary in order to complete everything that needs to be done. Prioritization is important because it with allow you to give your attention to tasks that are important and urgent so that you can later focus on lower priority tasks.
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While the average human is able to hold his or her breath for approximately one minute, a whale can dive for over 30 minutes without returning to the surface. Which of the following correctly describes this difference?
Whales need less energy than humans.
Whales gather energy from their environment better than humans.
Whales are more efficient at gas exchange than humans which helps them conserve energy.
Whales have cells that produce energy differently than humans.
