What makes science different from other ways of study? A. Only science has theories B. Science is based on evidence 3. Science is based on art D. Only science studies only supernatural events
Final answer:
Science is different from other ways of study because it is based on evidence and is limited to what can be observed and measured. It involves testing new ideas with experiments and observations, making its conclusions reliable and factual. So the correct option is B.
Explanation:
Science is different from other ways of study because it is based on evidence and logic. Science distinguishes itself by its systematic approach to gaining knowledge about the natural world through the use of observations, reasoning, and repeated testing. This process starts with a question, which scientists attempt to answer with empirical evidence and sound reasoning.
Unlike other fields of inquiry, science deals only with things that can be observed and measured. Phenomena such as supernatural beings or events are beyond the scope of science because they cannot be observed or tested with current scientific methods. Furthermore, science is continually evolving, as its ideas are open to revision and must withstand rigorous scrutiny and experimental verification.
In contrast to other disciplines that might rely on subjective interpretation or untestable beliefs, science requires that any new ideas be testable by experiments or observations. This makes its conclusions reliable and objective. As such, areas of knowledge like morality, aesthetics, or spirituality are considered beyond the realm of scientific inquiry. They are part of what is often termed 'nonscientific' or 'metaphysical' realms.
Birds have hollow bones. explain how this is adaptive.
Which of the following describe(s) the role of cytotoxic T cells in the specific immune response?
I. They kill cancer cells.
II. They kill cells infected by viruses.
III. They interact with MHC-I molecules
A.II only
B.II and III only
C.I and II only
D.I and III only
E.I, II, and III
Answer: Option E is the correct answer
Explanation:
T cells are part of the adaptive immune system and have a large repertoire of receptors that allow their activation or inhibition. T lymphocytes or T cells have the ability to recognize and lyse (kill) infected or transformed cells; these transform cells could include cancer or tumor cells. This recognition is due to the contact of the T cell receptors (principally the T cell receptor) with the Major Histocompatibility Complex molecule I (also known as MHC I). When cells are infected or are transformed, the expression of these MHC I molecules are altered, and therefore it is detected by T cells as something “abnormal” and therefore release molecules that cause cell death, such as perforin, granzymes, IFN-γ and the Tumor Necrosis Factor-α. Therefore, T cells can kill cancer or infected cells and interact with MHC-I molecules.
Food chains and webs not only describe the order organisms are eaten, but they also describe the _____.
a. flow of energy in an ecosystem.
b. importance of the ecosystem.
c. health of the ecosystem.
d. animals that are all related.
The transmission electron microscope is most useful for
1. looking at the surface features of a virus
2. seeing animal tissue that is visible to the naked eye
3. studying the structures of a live paramecium
4. viewing a cell’s mitochondria in detail ...?
1. looking at the surface features of a virus
Explanation;Electron microscopes are types of microscopes that uses a beam of electrons instead of light to magnify objects up to 500,000 times the actual size. These microscopes have a higher resolving power than the light microscopes since they use electrons.There are two types of electron microscopes ; that is Scanning Electron Microscope and Transmission Electron Microscope. Transmission electron microscope are used for studying internal structures of cells. In these microscopes electromagnets are used to magnify the image by passing a beam of electrons through a thin specimen.Answer:
A looking at the surface features of a virus.
Explanation:
The plasma membrane, according to the fluid-mosaic model is composed mainly of What and Proteins
Which of the following two cycles are the most closely related in their role in sustaining life?
a.
carbon and nitrogen
b.
water and nitrogen
c.
carbon and oxygen
d.
nitrogen and phosphorus
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.
During the cell cycle,
A) DNA is replicated once before mitosis and again before cytokinesis.
B) DNA is replicated during mitosis.
C) DNA is replicated before mitosis begins.
D) DNA is replicated directly after the completion of mitosis.
Answer:
dna is replicated before mitosis begins
Explanation:
DNA replication occurs during the S phase of interphase, prior to the onset of mitosis, to ensure each daughter cell has an identical set of genetic information. So the correct option is C.
Explanation:During the cell cycle, DNA is replicated before mitosis begins. This critical process of replication occurs in the Synthesis phase, or S phase, of the cell cycle, during interphase. The purpose of this replication is to ensure that each daughter cell produced after cell division will have an identical copy of the DNA, preserving the cell's genetic information.
Observations through autoradiographs indicate that none of the cells in mitosis were radioactively labeled, confirming that DNA replication does not occur during mitosis but rather beforehand. It's essential for DNA to be copied during interphase so that, during the mitotic phase, which includes mitosis and cytokinesis, each resulting daughter cell contains the same genetic content as the parent cell.
Therefore, the correct answer to the question of when DNA is replicated during the cell cycle is:
C) DNA is replicated before mitosis begins.
Where is oxygen content in a river or stream likely to be highest?
what part of a phospholipids is charged or polar
The diagram shows the stages of the eukaryotic cell cycle.
Which stage is labeled E in the diagram?
mitosis
interphase
S phase
G0 phase
The right answer is interphase.
In both eukaryotic and prokaryotic cells, the interphase is the period of the cell cycle that is characterized by an increase in cell volume, the cell transcribes its genes and the chromosomes are duplicated. It can be subdivided into several phases:
* phase G1 (growth or gap), during which the cell grows and performs the functions for which it is programmed genetically: biosynthesis of proteins, etc. It is during this phase that the young, freshly divided daughter cells grow to their final size.
* phase S (of the English synthesis, because of the synthesis of new DNA molecules), during which the chromosomal material is doubled by DNA replication. This is called chromosome duplication.
* phase G2, where the cell prepares to divide into two daughter cells. At the end of this phase, each chromosome is perfectly identical to its homolog in terms of morphology and from the point of view of the genes present, but each gene is not necessarily identical to its homologue, since generally several alleles exist.
** There is also the G0 phase, which is one of reproductive senescence. It is a possible exit from the control point at the end of G1, an alternative to the continuation of the G1 phase and the transition to the S phase. The G0 phase can be temporary or permanent and it is often induced by unfavorable conditions.
Answer:
The correct answer would be interphase.
The cell cycle is mainly divided into two phases: mitosis (M) and interphase.
Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.
It can be sub-divided into three stages:
Gap 1 (G₁) phase which is represented by letter A in the given diagram. Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram. Gap 2 (G₂) phase which is represented by letter C in the given diagram.Letter D represents mitosis (M) phase in which the actual division of the cell takes place.
Which of the following rocks forms from shells and calcium carbonate?
limestone
halite
mudstone
coal
Answer:
limestone
Explanation:
in human excess blood glucose is stored in the liver and in muscle tissues in form of glycogen.glycogen is a long chain of glucose molecules bonded together.because of this glycogen is called a
The correct answer is that because of this glycogen is called a polysaccharide.
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Which of these would BEST describe what would happen to a cell in a time of low nutrient supply?
a. The cell's growth would speed up significantly, leading to longer periods of time between cell division.
b. The cell's growth would slow down significantly, leading to longer periods of time between cell division. Eliminate
c. The cell's growth would speed up significantly, leading to shorter periods of time between cell division.
d. The cell's growth would slow down significantly, leading to shorter periods of time between cell division.
Which statement about the cell membrane is true?
A.It contains cellulose and sugars that are involved in communication.
B.It is present in animal cells only.
C.It is rigid and elastic for supporting the cell’s shape.
D.It prevents harmful substances from entering a cell.
Answer:
Option D
Explanation:
All cells including that of plants, animals, microorganisms such as bacteria, fungi, algae etc. consists of cell membrane. In-fact some of the internal cell organelles are also bound by membrane.
Cell membrane is made up of phospholipid bi-layers which consist of two essential components – a) proteins and b) Phospholipids.
This membrane is semi –permeable which means they can allow few substances to pass through it while restricts the passage of others.
Hence, it protects the cell from harmful substance in its surrounding.
Thus, option D is correct.
Thus, option D is correct.
Which of the following best describes how crossing over occurs during meiosis?
A. During prophase I, homologous chromosomes are lined up and pulled apart to opposite poles.
B. During prophase I, segments of chromatids are exchanged between homologous chromosomes.
C. During prophase II, chromosomes overlap and sections of each chromosome switch places.
D. During prophase II, sister chromatids trade places with each other before metaphase begins.
Crossing over occurs during the Prophase I stage of meiosis, where segments of chromatids are exchanged between homologous chromosomes, generating genetic diversity. The correct option is option b.
The process of crossing over occurs during meiosis, specifically in Prophase I.
This stage is crucial for creating genetic diversity. Option 'B' captures this best: During prophase I, segments of chromatids are exchanged between homologous chromosomes.
During this exchange, similar sections of DNA on these chromosomes swap places,
leading to the creation of new gene combinations which ultimately increase genetic diversity in offspring.
Learn more about Crossing Over here:
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Which physical factors MOST influence a marine biome?
A) tides, oxygen, costal hotel development
B) sunlight, fishing boats, whale population
C) wave motion, salinity, atmospheric pressure
D) plankton, water temperature, sand composition
Where does aerobic respiration take place in prokaryotes?
Aerobic respiration in prokaryotes occurs in the cell membrane, as they lack mitochondria. Not all prokaryotes use aerobic respiration; some are anaerobic or facultatively anaerobic, adjusting their metabolic process according to the presence of oxygen.
Aerobic respiration in prokaryotes, which includes bacteria and archaea, takes place in the cell membrane as they lack the organelles found in eukaryotes. Unlike eukaryotes, where aerobic respiration occurs in the mitochondria, prokaryotes carry out this process on their cell membrane since they do not possess membrane-bound organelles. It's important to note that not all prokaryotes are capable of aerobic respiration; some are strictly anaerobic or can switch between aerobic and anaerobic metabolism (facultative anaerobes). However, for those prokaryotes that do engage in aerobic respiration, the cell membrane is the site where the electron transport chain is located, and where ATP is generated by oxidizing nutrients using oxygen as the final electron acceptor.
when a person loses consciousness due to head injury what keeps the body functioning
Answer:
Autonomous nervous system
Explanation:
When a person is unconscious due to head injury, but the autonomous nervous system of the body keeps the body function normal by ensuring the flow of information between the brain and the rest of the body part.
The autonomous nervous system is the part of the nervous system of the body that is not controlled by our will but it works in the background in order to make sure that the body functions normally during an emergency.
Proteins serve a variety of functions in living organisms. Which of the following protein-containing substances plays a role in defense?
choices:
muscles
hair
antibodies
hormones
Answer:
hair
Explanation:
Answer:
A. Muscles
I've got it right on Study Island.
Explanation:
Prokaryotes and eukaryotes are similar in all of these aspects except
Answer:
the answer is The way in which the genetic material is found.
Explanation:
The main difference between prokaryotic and eukaryotic cells is that in prokaryotic cells, the genetic material is not separated from the cytoplasm since they lack a defined nucleus, so the genetic material is dispersed in its cytoplasm, while the eukaryotes present the genetic material organized in chromosomes surrounded by a membrane that separates them from the cytoplasm.
The average corn yield per acre has _______ during the last forty years.
The average corn yield per acre has doubled during the last forty years.
corn yields are coming in anywhere from 130 bushels per acre (bu/acre) to 260 bu/acre, as an stadistic data.
What is an organism’s niche?
Answer:
Part of a animals adaption to help it survive
Explanation:
During diffusion molecules move in what type of motion
it moves from higher to lower concentration
Population growth is limited by density-dependent factors such as _____.
predation and disease
volcanoes and earthquakes
droughts and floods
biotic and abiotic factors
The correct answer is predation and disease.
Density dependent factors are those factors, which are directly influenced by the density of a population. These factors directly influence the size and the growth of the population.
The predation and the disease are density dependent factors, as predation of a small density population would cause a significant decrease in number, so, predation is the limiting factor for the growth of the population. Same for diseases, the disease can affect most of the members of the population, and limiting its growth.
The changes in the environment and the natural calamities are density independent factor.
Deep-ocean lantern fish have special organs that use chemical energy to produce light. However, the light can only travel a certain distance through the water before it is no longer visible. How does this phenomenon validate the Law of Conservation of Energy?
The fish is a closed system, so energy is allowed to exit the system.
The Law of Conservation of Energy applies to biological, not physical, systems.
The light energy travels through the water until it is reflected or absorbed.
The light is not carried by matter and contains no energy.
Answer:
The correct answer is that the light energy travels through the water until it is reflected or absorbed.
Explanation:
The law of conservation of energy is illustrated as the form of energy that cannot be destroyed or produced, however, it gets transformed from one form to another. In case of Deep Ocean lantern fish that generates light in water, which travels along certain distance and then moves back, that is, in the reverse direction. This happens as the light travels in waves and when it comes in contact with the waves, it either gets absorbed or is reflected back.
A membrane which limits the type of molecules which will pass through it is called .
A membrane which limits the type of molecules which will pass through it is called a semi permeable membrane.
A semipermeable membrane is a membrane which can be biological or artificial, that will allow the movement of certain molecules through them by diffusion. Several factors such as pressure, concentration, temperature of the molecules on each side, and also the permeability of the membrane to each solute determine the rate of passage of the molecules.
As blood is filtered in the excretory system, which of the following functions like a recycling center?
A.the bladder
B.Bowman's capsule
C.tubules in the kidney
D.ureters between the kidney and the bladder
Answer: C. tubules in the kidney
The chief function of kidney is the production of urine. Kidney is the excretory system of the body. The blood being filtered by the glomerulus of the nephron reaches to the renal tubule in order to reabsorb water, glucose, nutrients and ions such as sodium. All these components are reabsorbed back into the blood. Therefore, tubules in the kidney functions like a recycling center as they allow the reabsorption and reuse of valuable components before they are excreted out along with urine.
DNA is spread out in the nucleus of a cell of non-dividing cells it is called ___________