Answer: Both B and C
B) They make internal changes to achieve a set point.
C) They let you know you need to put on a jacket in cold weather.
Explanation:
The true statement about negative feedback mechanisms are:
B) They make internal changes to achieve a set point.
C) They let you know you need to put on a jacket in cold weather.
What is a negative feedback mechanism?A negative feedback mechanism is sometimes referred to as negative feedback homeostasis in biology. It is a pathway that is activated by an output deviation and results in output changes that are opposite to the deviation that caused the pathway to be activated.
Thermoregulation is a type of negative feedback mechanism. When the temperature of the body changes, the mechanics change the blood sugar level.
Thus, the correct options are B. They make internal changes to achieve a set point and C. They let you know you need to put on a jacket in cold weather.
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Which of the following gives water its cohesive properties? And explain why.
b. Water’s polarity makes it attracted to other charged molecules.
c. Ionic bonds hold neighboring water molecules together.
d. The overall negative charge of water molecules prevents attraction to other substances
Answer:
Water is a polar molecule and also acts as a polar solvent. When a chemical species is said to be "polar," this means that the positive and negative electrical charges are unevenly distributed. The positive charge comes from the atomic nucleus, while the electrons supply the negative charge. It's the movement of electrons that determines polarity. Here's how it works for water
Explanation:
The cohesive properties of water are given to it due to - b. Water’s polarity makes it attracted to other charged molecules.
Cohesion property is the property that is the attraction of different molecules of the same kind. Water is highly cohesive as Its molecules show strong attraction forces.
The cohesive property of water is due to the hydrogen bonds in between hydrogen and oxygen molecules of the water molecule.Hydrogen bonding makes slightly positive and negative charges of the hydrogen and oxygen atoms makes water molecules polar.This polarity leads to the attraction of the water molecules known as cohesive property.Thus, the correct answer is - b. Water’s polarity makes it attracted to other charged molecules.
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How is the frequency of a wave measured?
Answer:
Hertz (Hz)
Explanation:
Hertz (Hz): One hertz is equal to one cycle per second. Cycle = One complete wave of alternating current or voltage.
Answer:
Hz
Explanation:
the number of waves that pass a fixed point in a given amount of time.
Which organ helps a child develop immunity?
the thyroid
the thymus
the pancreas
the ovaries
Answer:
Thymus!
Explanation:
what is the role of photosynthesis in the cycling of matter and low of energy within a cell ?
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The process of photosynthesisconverts light energy into stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen.Cellular respiration releases the energy needed to maintain body temperature despite ongoing energy transfer to the surrounding environment.The process of photosynthesis directly involves the cycling of matter as it converts the radiation energy from the sun to stored chemical energy.
What is Photosynthesis?Photosynthesis may be defined as a type of process through which green plants and some photosynthetic algae synthesize their own in the form of glucose food with the help of carbon dioxide and water in the presence of sunlight.
The complete reaction of photosynthesis is as follows:
[tex]6CO_2+12H_2O[/tex] → [tex]C_6H_1_2O_6+6O_2+6H_2O[/tex].Apart from photosynthesis, the mechanism of cellular respiration directly involves the cycling of matter.
This is because the reactants of cellular respiration are the products of photosynthesis and the reactants of photosynthesis are the product of cellular respiration.
The process of cellular respiration involves the derivation of energy from complex food molecules in the presence of oxygen.
Therefore, the process of photosynthesis directly involves the cycling of matter as it converts the radiation energy from the sun to stored chemical energy.
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Which is not an example of a single species on Earth?
A) All the bacteria in a pond
B) All the water lilies in a pond
C) All the bullfrogs in a pond
D) All the small mouth bass in a pond
Answer:
A) All the bacteria in a pond
Explanation:
The bacteria in a pond is not an illustration of a single species on Earth.
What are bacteria?They are the small and single-celled organisms. They are found in almost any part of the Earth and plays an essential part in the ecosystems of the planet. They are ubiquitous, and majority of them are free-living species usually comprising one biological cell.
Within a pond numerous species of bacteria are found. Some of the common bacterial species found in the ponds and the water sources are:
Aeromonas hydrophilaPseudomonas speciesBacillus speciesEnterobacter aerogenesStaphyloccus speciesKlebsiella pneumoniaeThus, the correct answer is option A, that is, in a pond different species of bacteria are found.
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yael made a wood frame. the height of the finished frame was 1.34 m. the frame was supposed to be 1.25 m. what is the percent error?
I need help
Answer:
The percent error between 1.34 and 1.25 is 6.716%
Solution: Given: Accepted Value = 1.34 , Observed Value = 1.25
Percent Error = | (Observed Value − Accepted Value) / Accepted Value | × 100
Substitute values into the formula and solve:
Percent Error = | (1.25 − 1.34) / 1.34 | × 100
= | (-0.09000000000000008) / 1.34 | × 100
= | -0.067 | × 100
= 6.716% (three decimal places)
Percent Error = 6.716%
Explanation:
Lactose molecules are different from maltose molecules in having:
A) only galactose
B)only glucose
C)one glucose and one galactose
Answer:
It is C because lactose has a glucose molecule and a galactose molecule.
Organisms under the taxonomic group Animalia are
A all single-celled autotrouphs
B sometimes mulit-celled autotrophs
C sometimes single-celled heterotrophs
D all multI-celled heterotrophs
Answer:
D all multI-celled heterotrophs
Explanation:
All living with organisms have been classified into kingdoms. One notable kingdom is Kingdom ANIMALIA. Members of kingdom Animalia are characterised by their HETEROTROPHIC nature i.e. they depend on other organisms for energy source.
Animals are all multicellular i.e. more than one cell and eukaryotic (membrane-bound nucleus). They are heterotrophs, which obtain their food either by saprophytism, predation, etc. Hence, according to this question, all members of the taxonomic group Animalia are multI-celled heterotrophs.
Answer:D
Explanation:
:11
8. Every cell contains a lipid bilayer known as the membrane. Cell
membranes are made up of which biomolecule? *
A.carbohydrates
B.nucleic acids
C.lipids
D.proteins
HELP ME!!! please❤️
During osmosis, which of the
following is most likely to pass
through a selectively permeable
membrane?
A. glucose molecules
B. water molecules
C. charged molecules
D. large molecules
Answer:
water molecules
Explanation:
pls mark as brainliest
Geologist want to take core samples from the Pacific Ocean and New Jersey. If they dig deep enough, will geologist eventually find hard, solid rock?
Answer:
C. under 1 and 2. because Earth's entire outer layer is made of hard, solid rock
Explanation:
8. The site of the process is the chloroplast. *
Photosynthesis
Respiration
Both
How does the human body return carbon to the atmosphere in the carbon cycle?
O Formation of glucose O Cellular Respiration O Photosynthesis O Waste products
Answer:
Cellular Respiration.
Explanation:
We breathe out carbon dioxide back into the air which contributes to the carbon cycle.
Hope this helps! :)
The human body returns carbon to the atmosphere in the carbon cycle by cellular respiration, which is present in the second option because the carbon dioxide is released from the human body from various processes.
What role does cellular respiration play in the carbon cycle?The cellular respiration that is carried out by animals and plants releases the carbon dioxide as a biproduct after consuming the oxygen and glucose, and when the carbon dioxide is released into the atmosphere, it is used by the photosynthetic process of the plants. The producer relies on cellular respiration because they use carbon dioxide for photosynthetic reactions, and the carbon cycle continues.
Hence, the human body returns carbon to the atmosphere in the carbon cycle by cellular respiration, which is present in the second option because the carbon dioxide is released from the human body from various processes.
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Parathyroid hormone (PTH) is secreted in response to a drop in calcium levels in the blood. The secretion of PTH is regulated by a negative feedback mechanism. What can you expect to happen to calcium blood levels as increased amounts of PTH are secreted? Why
Answer:
An excess of calcium in the blood produces a disorder called primary hyperparathyroidism.
Explanation:
Calcium is a mineral found mostly in bones, where it builds up and keeps them strong. There is also a small amount of calcium in the muscles and blood cells, where it performs several important functions. When the calcium level is low, the parathyroid glands (four small glands located in the neck) produce a hormone called parathyroid hormone. Its main metabolic function is to maintain the levels of ionic calcium in the blood and phosphate within normal limits. Hyperparathyroidism is a disorder that lies in the parathyroid glands themselves, in such a way that an excessive and autonomous secretion of parathyroid hormone is produced from them, which changes the metabolism of calcium producing hypercalcemia and bone structural alterations. It is usually caused by the presence of autonomous adenomas, which affect a single gland. Excess calcium in the blood can lead to osteoporosis (weakening of the bones) and kidney stones.
Which cell contains membrane bound organelles in addition to a cell wall and chloroplast
Answer:
Eukaryotic cells
Answer:
plant cells and eukaryotic algae
Explanation:
Only plant cells and some algae have chloroplasts.
According to the fluid mosaic model of cell membranes, phospholipids ________.
occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane
have hydrophilic tails in the interior of the membrane
can move laterally along the plane of the membrane
frequently flip-flop from one side of the membrane to the other
Answer:
They frequently flip-flop from one side of the membrane to the other.
According to the fluid mosaic model of cell membranes, phospholipids frequently flip-flop from one side of the membrane to the other.
What do you mean by the Fluid mosaic model?The fluid mosaic model may be defined as the model of the plasma membrane that consists of two-layer of lipids and proteins molecules are embedded among the lipid bilayer.
Phospholipids have a hydrophobic tail which is found in the interior of the membrane, while a hydrophilic head is found on the outer side of the membrane.
These molecules frequently flip-flop from one side of the membrane to the other with the help of flippase, floppase, and scramblase.
Therefore, it is well described above.
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Please help me with this question!
Answer: It’s the third one they have different weights
Explanation: the weight of the second one is what brought it down to the bottom and the first one didn’t have a lot of weight so it just flouted at the top.
Help!!! ( I'm doing a bi weekly and these questions are Hard) Darnel draws a picture of a nitrogen atom. He draws a small circle for the nucleus and draws dots around the circle to represent electrons. How many dots does he draw?
A. 5
B. 7
C. 14
D. 16
Answer:7
Explanation:subtract the number of protons to get 14-7=7
(-1, 4) and (0, -1)
linear equation
Answer:
yes it's linear
Explanation:
PLEASE HELP! DOWNLOAD THE PDF TO SEE THE QUESTIONS!!!
Answer:
it wont let me download pdf or else i would help
Explanation:
What do the sensors in our bodies monitor ?
Answer:
Body sensors rely on identification and quantification of internal or external stimuli like pressure, heat, texture, vibration, and tensile or compressive deformations.
Answer:
Baroreceptors sense blood pressure and then send signals to the heart, the arterioles, the veins, and the kidneys that cause them to make changes that lower or increase blood pressure.
Explanation:
There are sensors in the walls of the arteries and heart that sense blood pressure. These sensors are called baroreceptors.
Which group in an ecosystem performs photosynthesis?
A. Autotrophs
B. Secondary consumers
C. Heterotrophs
D. Primary consumers
Answer:
its A
Explanation:
An autotroph or primary producer is an organism that produces complex organic compounds (such as carbohydrates, fats, and proteins) using carbon from simple substances such as carbon dioxide, generally using energy from light (photosynthesis) or inorganic chemical reactions (chemosynthesis). Autotrophs do not need a living source of carbon or energy and are the producers in a food chain, such as plants on land or algae in water (in contrast to heterotrophs as consumers of autotrophs or other heterotrophs). Autotrophs can reduce carbon dioxide to make organic compounds for biosynthesis and as stored chemical fuel. Most autotrophs use water as the reducing agent, but some can use other hydrogen compounds such as hydrogen sulfide. hope this helps :D
Which two statements did the work of Schleiden and Schwann add to the cell theory?
A. Cells contain genetic material that consists of DNA.
B. All living things are made of one or more cells.
C. All cells come from other living cells. D. The cell is the basic structural and functional unit of life. PREVIOUS NEXT-
Answer:
B and D
Explanation:
Schleiden and Schwann proved that plants and animals have cells like humans do proving that every living thing has cells.
A lot of the solar energy that reaches Earth hits the____________.
A. North Pole
B. South Pole
C. Equator
D. None of the above
Answer:
south pole
Explanation:
a lot of solar energy that reaches earth hits the south pole
molecules move in and out of a cell by diffusion. the picture shows a cell molecules both inside and outside the cell how will the molecules in this illustration move as a result of diffusion
out of the cell
into another cell
to the extern environment
into the cell
Answer: The molecules on the exterior of the cell will move inwards due to the difference in concentration
Explanation:
This happens because of Endosmosis, where the water molecules move from a region of higher concentration to a region of lower concentration through a semi-permeable membrane. Endosmosis is when the cell swells up due to a higher concentration in the exterior of the cell and a lower concentration in the interior of the cell.
Therefore, the water molecules move inside the cell until the concentrations of the exterior and the interior of the cell is balanced
Going by the diagrammatic illustration, the molecules would move into the cell until an equilibrium is reached.
Diffusion generally involves the movement of molecules from the region of higher concentration of a molecule to the region of lower concentration of the same molecule. The net movement will continue until both sides have equal concentrations of the molecule.
Looking at the diagram, there are more of the molecule outside the cell than inside of it. Thus, the molecules will keep moving inside the cell until both the outside and inside have the same concentration.
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Tropisms are _____ caused by a change in a plants growth
Identify the factors that would increase the delivery of oxygen to the tissues.
A high blood volume and high altitude
B low blood volume and high altitude
C high hemoglobin and low altitude
D low hemoglobin and low altitude
Answer:
b i think
Explanation:
look
What is a diploid chromosome?
Answer:
Diploid describes a cell that contain two copies of each chromosome. ... The total number of chromosomes in diploid cells is described as 2n, which is twice the number of chromosomes in a haploid cell
Hope this helps.
How has the development of a pine and then a hardwood forest affected populations of shrubs?
The development of the two types of forests has negatively affected populations of shrubs
Answer:
Yes, shrubs are affected.
Explanation:
The development of a pine and then a hardwood forest affected populations of shrubs because pine and hardwood trees are higher in length than shrubs so the shrubs did not gain sunlight and also all the nutrients present in the soil is extracted by the pine and hardwood trees. The shrubs present below the pine and hardwood trees slowly removes from that environment due to unavailability of sunlight and nutrients.
The nucleus is like the ____________ of the cell.
foot
stomach
hand
brain
The nucleus is like the brain of the cell. This is because the nucleus controls eating, movement, reproduction, etc. hope this helps!