Water freezing is a physical change because it involves a transition in the state of matter, from liquid to solid, without altering the substance's basic nature. Physical changes are typically reversible, as in the case of water changing to ice and then back to water.
Explanation:The freezing of water is called a physical change because it involves a change in the state of matter, from liquid to solid, without altering the fundamental composition or identity of the substance. In a physical change, substances merely change their forms but not their internal structures. Water, for example, may change from a solid (ice) to a liquid (water) or a gas (steam) but it still remains H2O. Physical changes are usually reversible. For instance, frozen water (ice) can revert back to its liquid state when heat is applied.
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Botulinum toxin binds to receptors present at the axon terminal in order to enter the neuron
true or false
The Botulinum toxin is a neurotoxins produced by the Clostridium botulinum. This toxin bind to the neuron presynaptically and by the exocytosis it enters in the neuron. It has a greater affinity to Cholinergic receptors as compared to the acetylcholine. Hence, the toxin causes the decrease in the release of the acetylcholine molecules.
As a result of the decreased in the release of the acetylcholine the neuro-transmission is blocked, and due to this the person dies.
Hence, the given statement is true.
How can disruptions in the cell cycle lead to cancer?
What is the estimated volume of water that covers the Earth?
33 million cubic miles
330 million cubic miles
33 thousand cubic miles
330 thousand cubic miles
The correct answer is - 330 million cubic miles.
The Earth is dominated by water, which surpasses the land area by far. This water also has a great volume, with the estimates being around 330 million cubic miles.
Most of the water is a salt water, with approximately 97.5% of the total volume of the water on the planet, and only 2.5% being fresh water. What's even more interesting is that out of those 2.5% of fresh water, only 0.3% are actually in liquid form, while all the rest is frozen, mostly on and around the poles of the planet.
During a spring tide, which phases could the Moon be in? Select all that apply. A. full B. new C. first quarter D. third quarter
What allows humans to have different traits from each other?
A. They have different numbers of chromosomes.
B. They have different genes.
C. They store DNA in different places.
D. They have different haploid numbers.
B. They have different genes.
Vertebrates that are warm blooded, have feathers and reproduce by laying eggs would be classified as _______
Answer:
Class - Aves, examples birds.
Explanation:
Birds are vertebrates that are included in the class aves. Their body is covered with feathers. Have wings for flying. They are warm blooded (endothermic) animals with thin-walled and hollow bones. These bones are denser, stiffer, and stronger. They high metabolic rate to fulfil high energy requirement. They have beak made of keratin. They are oviparous or egg laying vertebrates.
One student group's data for amount of yeast can be seen here. Describe the students' results. A) The optimum amount of yeast for maximum fermentation is 2 grams. B) There is no correlation between amount of yeast and the rate of fermentation. C) There is a inverse relationship between the rate of fermentation and amount of yeast. D) There is a direct relationship between the amount of yeast and the rate of fermentation.
Answer:
There is a direct relationship between the amount of yeast and the rate of fermentation.
Explanation:
Answer:
Option D, There is a direct relationship between the amount of yeast and the rate of fermentation.
Explanation:
The rate of fermentation increases till the time an optimum stage is not reached . Once the optimum stage is reached , any further increase in yeast concentration do not affect fermentation rate. Thus, it can be said that before reaching optimal value of yeast concentration, the rate of fermentation is directly proportional to the yeast concentration.
Hence, option D is correct.
When new cells are formed through the process of mitosis, the number of chromosomes in the new cells
A)is half of that of the parent cell.
B)decreases every time the cell divides.
C)increases every time the cell divides.
D)remains the same as in the parent cell.
When new cells are formed through the process of mitosis, the number of chromosomes in the new cells remains the same as in the parent cell.
What is chromosome ?A chromosome is defined as a thread-like structure present in the nucleus of cells such as both prokaryotic and eukaryotic cell and it is made of a molecule of DNA (Deoxyribonucleic acid) and histone proteins.
It is composed of three components, DNA, proteins and RNA, amount of the DNA content ranges from 30 to 40 %, the amount of proteins from 50 to 65%, and small amount of RNA from 1 to 10%.
Two types of protein present in DNA such as histone and non-histones proteins, histone constitute large amount (90% of total protein), whereas non-histone is present in small amount (around 10% of total protein).
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explain why the ptolemaic theory seems logical based on daily observations of the rising and setting sun. ...?
The oceans were formed during the original accretion of the Earth
True or False
The answer is false! :) Just took the test. ;D
Which piece of bubble gum blows the biggest bubble?
The average size bubble blown using Dubble Bubble bubble gum was 3.7 inches. Hubba Bubba's average bubble was 3.3 inches, Bazooka's was 3 inches. Bubblicious had an average bubble of 2.7 inches and Bubble Yum was close behind with an average bubble of 2.6 inches.
So if you want to blow a big bubble Dubble Bubble bubble gum is the gum for you
Which law best describes why the planets are pulled toward the Sun and orbit it?
Answer:
The right answer to this question is: Newton's first law, the Law of Motion.
Explanation:
This law describes why the planets are pulled toward the sun in a very simple way. Every body in motion will continue like that, until another one interfers this process.
But in this process, we need to remember that the sun is very big, and bigger the body, bigger the gravity to pull the bodies around it towards it. The sun is very big, and this is how the planets keep moving around it.
A formal tone is most appropriate to use in
The correct answer on edgenuit.y is essays.
(I just took the quiz)
Answer: essay
Explanation:
A formal tone is most appropriate to use in essay
Nucleic acids are biological polymers that are comprised of nucleotide monomers covalently bonded together.
Nucleic acids, encompassing both DNA and RNA, are biomolecules critical for genetic information storage, protein synthesis, and heredity. They are composed of chains of nucleotides with a sugar-phosphate backbone and sequence-specific nitrogenous bases.
Explanation:Nucleic Acids Definition and RoleNucleic acids are essential biopolymers that are critical for storing and expressing genetic information in living organisms. These molecules include two main types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Each nucleic acid strand is composed of monomers called nucleotides, which contain a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleotides connect via phosphate diester linkages, resulting in polynucleotide chains with directionality, indicated by a free 5' phosphate group and a free 3' hydroxyl group.
Specifically, DNA contains two polynucleotide chains forming a double helix, held together by bonds between complementary bases. It is the molecule that holds the genetic blueprint for protein synthesis and inheritance of traits. RNA, on the other hand, usually consists of a single polynucleotide chain and plays a role in protein synthesis as well as in various regulatory and catalytic activities within the cell.
By binding together, nucleotides form the backbone of nucleic acids, which in the case of DNA, creates its characteristic double helix shape. The sequence of nucleotides within nucleic acids encodes the genetic instructions vital for cellular functions such as cell division, protein synthesis, and the transmission of genetic information from one generation to the next.
Why do the atoms in the top rows in the Periodic Table have higher electronegativity than atoms in lower rows?
The electrons of those atoms are farther from the nucleus.
The electrons of those atoms are closer to the nucleus.
The electrons of those atoms are part of the nucleus.
When there is unequal sharing between two atoms of the electrons in a bond, which type of bond is it?
polar covalent
electronegative
ionic
nonpolar covalent
Answer:
For 1: The correct answer is the electrons of those atoms are farther from the nucleus.
For 2: The correct answer is polar covalent.
Explanation:
For 1:Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The size of an atom increases as we move down the group because a new shell is added and electron gets added up.
As, the size of an element increases, the valence electrons gets away from the nucleus. So, the attraction between the nucleus and the shared pair of electrons.
Hence, the correct statement is the electrons of those atoms are farther from the nucleus.
For 2:A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the unequal sharing of electrons between the atoms.
An electronegative atom is the one which attracts the shared pair of electron towards itself.
Ionic bond is formed when there is complete transfer of electron from one atom to another atom.
Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the equal sharing of electrons between the atoms.
Hence, the correct answer is polar covalent.
Where is oxygen content in a river or stream likely to be highest?
Which statement explains why oxygen molecules easily diffuse across a cell membrane while glucose molecules do not?
A. Oxygen is polar.
B. Glucose is too big to pass through.
C. Protein membranes block glucose.
D. Oxygen is a gas.
Answer:
Glucose is too big to pass through
Explanation:
What are the four reasons why cells divide
Cells divide for growth of an organism, repair of damaged tissues, maintenance of healthy tissues, and regulation to prevent the propagation of damaged cells due to accumulated mutations.
Cell division is a critical process in all living organisms, and it occurs for several fundamental reasons that are essential for life. Here are four reasons why cells divide:
Growth: From the development of an embryo to an adult organism, repeated cell division allows for the continuous growth of the organism. A single fertilized egg, or zygote, divides multiple times to produce the vast number of cells required to form a mature multicellular organism.Repair: Cell division is necessary to repair damaged tissues, such as healing a cut on the skin. It allows for the replacement of damaged or worn-out cells, ensuring optimal function of tissues and organs.Maintenance: Even after an organism has fully grown, cell division continues to replace old and worn-out cells to maintain healthy tissue function.Mutation Regulation: Cells are programmed to divide a certain number of times. Accumulation of mutations can damage DNA, and cell division is regulated to prevent propagation of damaged cells.In summary, cell division is a key biological process that allows for growth, repair, maintenance, and the regulation of cell lifecycle, ensuring the health and sustainability of life.
Which statement correctly describes the difference between meiosis I and
meiosis II?
A) Meiosis I brings together sister chromatids, and meiosis II separates them.
B) Meiosis I separates tetrads, and meiosis II separates sister chromatids.
C) Meiosis I separates sister chromatids, and meiosis II separates tetrads.
B) Meiosis I separates tetrads, and meiosis II separates sister chromatids.
Membrane proteins are among the most important proteins biologically because they allow the cells to communicate with their environments. These membrane proteins are responsible for ALL BUT which process?
A) triggering ion channels
B) identifying foreign cells
C) regulating intake of oxygen
D) activating growth hormone reactions
Membrane proteins are the proteins responsible for the interaction with the biological membrane. It is associated with triggering ion channels, identifying foreign cells, and activating growth hormone reactions.
What are the functions of membrane proteins?Membrane proteins have a large number of functions, including the following:
It helps cells to communicate with each other.Maintain the shape of cells.Work according to the changes done by chemical messengers.Transport and share the material through the cell membrane.Activate several reactions.It is not involved in regulating the intake of oxygen.
Thus, the correct option is C.
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cells are alive, but not all living cells are organisms.explain
Which of these is NOT on the electromagnetic spectrum?
A. radio waves
B. visible light
C. sound waves
Final answer:
Radio waves and visible light are both on the electromagnetic spectrum, but C. sound waves are not. Sound waves are mechanical waves, unlike radio and visible light, which are categories of electromagnetic radiation.
Explanation:
The electromagnetic spectrum comprises a range of electromagnetic radiation types, each categorized by their wavelength or frequency. Among these, radio waves and visible light are two different categories. Radio waves fall on the low-frequency side of the electromagnetic spectrum, having much longer wavelengths than visible light. In contrast, visible light falls within the narrow violet-to-red range of the spectrum that we can see with our na_ked eyes and is used in a variety of applications, from photosynthesis to detecting the vibrant colors of sea life.
However, sound waves are not a type of electromagnetic radiation; they are mechanical waves that require a medium to travel through, such as air or water. Thus, the correct answer to the question 'Which of these is NOT on the electromagnetic spectrum?' is C. sound waves.
Mitosis produces which cell type?haploiddiploidchromosomegamete
Mitosis produces diploid cells, which are identical to the parent cell. These cells are crucial for growth, repair of tissues, and asexual reproduction. In contrast, meiosis creates haploid cells or gametes needed for sexual reproduction.
Mitosis is a process of cell division that produces two identical daughter cells from a single cell, each maintaining the diploid state of the parent cell. In other words, through mitosis, a cell divides into two cells, each with the same number of chromosomes as the original cell. This process allows for growth, repair of tissues, and asexual reproduction in organisms.
On the contrary, meiosis is a type of cell division that results in four daughter cells, each with half the number of chromosomes of the original cell. These are known as haploid cells which are often referred to as gametes or sex cells. These cells are essential for sexual reproduction because when two gametes combine during fertilization, they restore the diploid state.
Summing up, mitosis produces diploid cells whereas meiosis generates haploid cells.
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Which of the following is a likely reason for the decrease in stability for societies that rely on external control?
A. Societies that rely on external control are less likely to maintain sustainable practices, due to their larger size.
B. Societies that rely on external control are more likely to be self-regulating.
C. Societies that rely on external control are less likely to have low unemployment rates.
D. Societies that rely on external control are more likely to be independent of water and biomass resources.
Answer: A. Societies that rely on external control are less likely to maintain sustainable practices, due to their larger size.
Societies that rely on external control are less likely to maintain sustainable practices, due to their larger size is the likely reason for the decrease in the stability for the society that rely on the external control because the maintenance and control of the natural resources should be done willingly at the individual level this indicates that how aware the society is in sustainably using the resources. The external influence imposed by the society in conservation and sustainability shows the instability.
This is the circulation of water between land, air and surface.
what A hypothesis that two organisms from different species are related to each other is best supported by?
The relationship between different species can be supported by their similar DNA sequences and homologous structures, following the principle of maximum parsimony. These genetic and morphologic evidences are crucial in modern taxonomy for determining evolutionary relationships.
Explanation:A hypothesis that two organisms from different species are related to each other is best supported by evidence that their DNA sequences are highly homologous. This means that the genetic material of the two species has many similarities, indicating a close evolutionary relationship.
Additionally, scientists look at homologous structures, which are physical features that are similar due to evolutionary origin, rather than analogous structures, which may look similar but are not derived from a common ancestor. The concept of maximum parsimony also plays a role, suggesting that organisms with more homologous structures are more closely related evolutionarily. In modern taxonomy, scientists often refer to the "tree of life" to explain phylogeny or the evolutionary relationships among species. All branches on this tree originate from a single trunk, which represents the common ancestor of all life forms.
Which vegetable is in chicken divan: asparagus or corn or broccoli?
Bryophytes are also called
How is the size of a planet related to the thickness of its atmosphere
The bigger the planet the bigger the gravitational pull of the planet , which is also stipulated in Newton Law of gravity. The bigger the planet, therefore, the bigger the atmosphere it would have. This is because its gravity is able to overcome the kinetic energy of the gas molecules (especially when heated by rays from a star they are orbiting) that would allow the gas atoms/molecules to escape into space. This is also why the large planets are all gas giants such as Jupiter.
The ____________ is part of the appendicular skeleton, while the ________ is part of the axial skeleton
Answer:
Scapula and sternum.
Explanation:
The scapula is also known as shoulder bone, blade bone, shoulder blade or wing bone, is the bone which connects the upper arm bone with the collar bone. Scapulae are in pair they are connected with each other and they are mirror image of each other. Therefore it is the part of appendicular skeleton.
The sternum or breastbone is located in the chest central part and it is a long flat bone. It connects with the ribs through cartilage and it forms the front of rib cage, which help in protecting lungs, heart and blood vessels from the injuries. And it is a part of the axial skeleton.
The correct answer is: "The femur is part of the appendicular skeleton, while the vertebra is part of the axial skeleton."
The human skeleton is divided into two main parts: the axial skeleton and the appendicular skeleton. The axial skeleton includes the bones that form the axis of the body and consists of the skull, vertebral column, ribs, and sternum. The appendicular skeleton, on the other hand, is made up of the bones of the upper and lower limbs as well as the girdles that attach the limbs to the axial skeleton.
The femur, which is the thigh bone, is the longest and strongest bone in the human body and is part of the lower limb of the appendicular skeleton. It articulates with the hip bone proximally and the tibia and patella distally, providing support and mobility for walking, running, and jumping.
The vertebra, which is a single bone of the vertebral column, is part of the axial skeleton. The vertebral column, also known as the spine or backbone, is composed of a series of vertebrae stacked one upon the other, separated by intervertebral discs, and held together by ligaments. It houses and protects the spinal cord, supports the weight of the body, and provides flexibility to the torso.
Therefore, when filling in the blanks, the femur represents a bone of the appendicular skeleton, while the vertebra represents a bone of the axial skeleton.