Scientists use observations and data to form and test
Scientists use observations and data to form and test hypotheses. They observe a phenomenon, form a hypothesis about why it occurs, and use data to test its validity through experiments, making observations and data the backbone of the scientific method.
Explanation:Scientists use observations and data to form and test hypotheses. These hypotheses are proposed explanations for specific phenomena that have been observed. A scientist makes an observation, forms a hypothesis about why that phenomenon occurs, and then uses data to test the validity of the hypothesis.
For example, a scientist may observe that certain plants grow better in certain types of soil. They might form a hypothesis that the nutrients in the soil are causing this difference. To test this hypothesis, they would conduct an experiment comparing plant growth in different types of soil, carefully recording and analyzing the data from this experiment.
In this way, observations and data form the backbone of the scientific method, which is a systematic and logical approach to discovering how things in the universe work.
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The explanation which Isaac Newton gave for the equal and opposite reaction to every applied force is summarized in:
A.1st Law
B.2nd Law
C.3rd Law
D.Universal Gravitation
The fluid mosaic model describes the structure of the plasma membrane. Embedded within the plasma membrane are proteins and carbohydrates that contribute to the term mosaic. Glycolipids and glycoproteins are examples of carbohydrates from on the surface of red blood cells that determine ABO blood type. These glycoproteins and glycolipids are important for
A. Cell to cell identification
B. Active Transport
C. Diffusion
A. Cell to cell identification
When astronauts brought back rock samples from the Moon, the minerals present were mostly the same as those found on Earth. Can you think of reasons why this might be so? Would you expect minerals on Mars or Venus to be the same, or at least very similar, to those on Earth?
The minerals present in moon rock samples are mostly the same as those found on Earth because the Moon and Earth share a common history, believed to have been formed out of the debris from a massive collision with Earth around 4.5 billion years ago. For this reason, we can expect some similarities in mineral composition. For Mars and Venus, similarities to Earth's minerals may exist, but there could also be significant differences due to the unique geological history and environmental conditions of each planet.
The mineral compositions of celestial bodies are determined by their formation processes and the conditions they have been subjected to over time. The reason the Moon's minerals are similar to Earth's is that it likely originated from Earth's material. This common origin would naturally lead to similar minerals forming on both bodies. Mars and Venus, however, formed independently and have different environmental conditions and geological histories. Mars, for example, has a different atmosphere and has been exposed to different conditions than Earth, which would influence its mineralogy. Similarly, Venus's extreme temperatures and atmospheric pressure would also likely result in a different set of minerals. Nevertheless, all rocky planets in our solar system formed from the same protoplanetary disk, which means there are certainly materials and minerals that they have in common.
what are some important reasons for studying biology
Which statement is the best example of pseudoscience?
Scientists have observed many constellations in our universe.
Mary thinks her astrological sign, Leo, is a perfect fit for her personality.
Satellites found in space record images of events that take place on the Earth.
The employees at the observatory use telescopes to study the stars.
Answer:
B
Explanation:
Mary thinks her astrological sign, Leo, is a perfect fit for her personality.
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A group of students has performed an experiment to study the ideal temperature for the maximum activity of biological enzymes. Enzymes are specific to their environment; in other words, they work best at a specific pH and specific temperature. Which graph represents optimum enzyme activity at approximately 37 degrees Celsius?
Please refer to figures below.
Answer;
The first graph represents such an enzyme.
Explanation;
This is because the enzyme demonstrates greatest activity at approximately 37 °C but then the activity starts to decrease due to the denaturing of the enzyme.
As the temperature increases, so does the rate of reaction. But very high temperatures denature enzymes. The graph shows the typical change in an enzyme's activity with increasing temperature. The enzyme activity gradually increases with temperature up to around 37 ºC, or body temperature. Then the activity decreases above 37 ºC, because above this temperature the enzymes will denatured.
Suppose that Louisa is cut by broken glass during a lab accident. Which is the proper place to dispose of the paper towels that are used to clean up the blood?
broken glass container
hazardous waste container
spilled chemicals container
classroom waste container
Answer: hazardous waste container
Explanation:
A hazardous waste container is the container where hazardous waste which have been used in clinical trials, hospital use, nuclear power plants, hazardous chemicals from the laboratory can be stored, treated and transported.
Biohazardous waste, is the infectious waste which can be grown over the biological material like tissues, body organs, blood, urine, blood transfusion tube and others.
The paper towel will contain blood which is subjected to the growth of the pathogens and can cause huge infection hence, it is the example of material which should be disposed off in the hazardous waste container.
An increase in the concentration of ATP in a muscle cell is a direct result of which life function? ...?
Final answer:
The increase in ATP concentration in muscle cells is primarily associated with muscle contraction, powered by mitochondria within the cells. During intense exercise, ATP can also be produced anaerobically, resulting in lactic acid as a byproduct.
Explanation:
An increase in the concentration of ATP in a muscle cell is a direct result of the life function known as muscle contraction. ATP, or adenosine triphosphate, is the primary energy currency of the cell and facilitates various bodily functions including muscle contractions, nerve signal transmission, and the absorption of nutrients in the gastrointestinal tract.
Muscle cells are equipped with a high concentration of mitochondria to produce ATP, ensuring that the demand for energy during muscle activity can be met. During intense exercise, when there is not enough oxygen for aerobic respiration, muscle cells produce ATP anaerobically, leading to the production of lactic acid alongside the ATP.
Scientists believe plant life moved from water to land and that plants evolved from multicellular _____.
plankton
green algae
protists
protozoa
Because cosmologists can't go out into space and test all of their theories, they must depend on the cosmological principle. This principle assumes that _____.
Answer:
Answered
Explanation:
Because cosmologists can't go out into space and test all of their theories, they must depend on the cosmological principle. This principle assumes that
The laws of physics remain steady and same through out the entire universe. This is why they test all of their theory on Earth. The do believe on cosmological principles. The Principles remain the same in the entire universe.
When a species is made up of different smaller groups, each of those smaller groups is known as a _____.
Acupuncture is an alternative medicine that uses wire-thin needles inserted by a trained practitioner into specific points in the body. This ancient form of pain relief and stimulation is said to benefit patients by blocking channels which practitioners claim allow pain to travel within the body. This practice became more widely recognized and used after a New York Times reporter wrote in 1971 of a positive experience with it after surgery.
Those who doubt the effectiveness of this treatment for pain attribute the pain relief to a placebo effect: if a patient believes something will reduce their pain, they will experience some relief. The National Institutes of Health says that acupuncture relieves pain and reduces nausea and vomiting, although it is unclear how it works. The few adverse effects reported are due to improperly sterilized needles or improper delivery, making this still a fairly low risk option. For anyone considering acupuncture, they should first research its effectiveness for their specific condition.
Summary of statements published by the National Institutes of Health
Which statement best explains the scientific claim about how acupuncture treatment reduces pain?
a) Acupuncture is an alternative medicine that uses wire-thin needles inserted by a trained practitioner into specific points in the body.
b) Those who doubt the effectiveness of this treatment for pain attribute the pain relief to a placebo effect: if a patient believes something will reduce their pain, they will experience some relief.
c) This ancient form of pain relief and stimulation is said to benefit patients by blocking channels which practitioners claim allow pain to travel within the body.
d)For anyone considering acupuncture treatment, they should first research its effectiveness for their specific condition.
Too much logging in the Oyamel fir forests could lead to the eastern monarch butterfly going extinct because _______. a. the entire population of the species spends winter in Oyamel c. the winters are too cold in Oyamel b. the butterflies breed in the Oyamel fir trees d. the butterflies feed on the Oyamel fir tree
Answer: a. the entire population of the species spends winter in Oyamel.
Monarch butterfly cannot survive in extreme climatic conditions. These butterflies spend winter months in Oyamel fir forest of Mexico. Oyamel forest situated in mountain hills provides an ideal climate for their survival. Here, the temperature ranges from 0 to 15 degree Celsius. If the temperature is low, the monarch butterflies uses their fat reserves. The dense canopy of trees in Oyamel fir forest drives heat from the ground at night and protect these butterflies from rain, wind and snow. The supply of excess of water as in the case of water logging condition can make trees susceptible to diseases and pests. In winter majority of monarch butterfly concentrate over the same region of Oyamel fir forest. Such water logging conditions will make the forest unsuitable for survival and further may lead to extinction of these butterflies.
Answer:
A
Explanation:
what process is shown? A. endocytosis B. phagocytosis C. pinocytosis D. exocytosis
Endocyotosis was incorrect.
Answer:
D. exocytosis
A certain cell can no longer package and release materials out of the cell. which of the cells organelles is not working?
Answer:
golgi apparatus
Explanation:
The physical need to eat food is called A. hunger B. appetite C. Psycological desire. D. nutritional value A?
The physical need to eat food is referred to as hunger. Appetite, psychological desire, and nutritional value are separate aspects related to food consumption. Hunger is a body's physical demand for energy.
Explanation:The physical need to eat food is primarily driven by a body's demand for energy and is known as hunger. This is different from appetite, which is the desire to eat food often prompted by external factors such as sight, smell, or thought of food, not necessarily due to physical need. Psychological desire could be a craving to eat a specific kind of food and nutritional value refers to the benefits we get from the food we eat.
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which three elements do all four biomolecules have in common
The three elements that are common in all four organic molecules are carbon, hydrogen, and oxygen.
The three forms of almost all chemical structures needed for life, including carbohydrates, lipids, and proteins.
The four main classes of organic compounds are - carbohydrates, lipids, proteins, and nucleic acids that are essential to the proper functioning of all living things are known as polymers or macromolecules.All of these compounds are built primarily of carbon, hydrogen, and oxygen but in different ratios. They are produced by cells and living organisms.Biomolecules contain various elements like carbon, nitrogen, hydrogen, oxygen, sulfur, and phosphorus.Among all these elements, carbon, oxygen and hydrogen are commonly found in all biomolecules.Thus, The three forms of almost all chemical structures needed for life, including carbohydrates, lipids, and proteins.
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which of the following does not show the law of conservation of mass?
A. 24g of Mg burn in 32g O2 to produce 56g of MgO
B. 24mL of Mg burn in 32mL O2 to produce 56mL of MgO
C. 2 atoms of Mg react with 1 molecule of O2 to produce 2 units of MgO
D. 1 atom of Mg reacts with 1 atom of O to produce a unit of MgO that contains 2 atoms
Answer:1. B
2. D
,3. A
4. B
5. A
6. B
7. D
8. B
9. B
10. A
11. D
12. B
13. D
14. C
15. B
Explanation:
Carbon dioxide is released when which of the following phenomena occur? nitrogen fixation decomposition photosynthesis burning fossil fuels
During which three phases of mitosis are individual chromosomes no longer visible?
For the DNA base sequence GGG what is the mRNA codon? What is the tRNA codon that binds to the mRNA codon and what is the correct amino acid that is coded by the base sequence? ...?
In DNA molecules nucleotides bond together according to the nitrogenous bases. Which of the following correctly describes how nitrogenous bases bond together?
A). Purines bond to other purines
B). Purines bond to pyrimidines
C). Purines and pyrimidines can bond with themselves and each other
D). Pyrimidines bond to pyrimidines
Final answer:
OPTION B.
In DNA, purines (adenine and guanine) bond to pyrimidines (cytosine and thymine), which maintain the uniform structure of the DNA double helix.
Explanation:
In DNA molecules, nucleotides bond together according to the nitrogenous bases. The correct description of how nitrogenous bases bond together is that purines bond to pyrimidines. This means that the two purines, adenine (A) and guanine (G), with a double-ring structure, will bond with the pyrimidines, cytosine (C) and thymine (T), which have a single-ring structure. Specifically, adenine pairs with thymine, and cytosine pairs with guanine. This bonding maintains the uniform shape of the DNA double helix by keeping the distance between the two DNA chains constant.
A scientist is studying the action of RNA polymerase during transcription. He wants to know what type of bases are added to the growing mRNA by RNA polymerase.
A:bases complementaryto the template DNA
B:bases the same as those in the template
C:bases similar to the template DNA
Unicellular prokaryotes,called___________, are adapted to living in a remarkable number of different places. ...?
Describe two themes that connect all the information in biology. use an example to help explain the theme
Answer:
Two themes that connect all the information in biology are structure and function.
Explanation:
In word Biology, bio means life and logy means study. The study of life is Biology. The study involves structure and function features of living things. The structure and function tells us about the interaction of living organisms with the environment. For example, the large organisms have small surface area and small organisms have large surface area. This helps in heat lost or conservation.
An example of parallel choices in a key is _____.
A. flower color is red; AA. flower color is blue
A. object can fly; AA. object is black
A. animal has 4 legs; AA. animal has 4 teeth
Answer;
A. flower color is red; AA. flower color is blue
An example of parallel choices in a key is, A. flower color is red; AA. flower color is blue.
Explanation;
-Dichotomous key allow the user to determine the identity of items using a sequence of alternative choices. Dichotomous keys always give two, mutually exclusive choices in parallel statements. The pair of statements is referred to as a couplet and each 1/2 of a couplet is a lead. At each couplet of a dichotomous key the user is presented with two choices about a specific character present in the group of organisms, a specific character state is described for each lead.
-Sometimes the characters are quantitative (i.e., measurements) and sometimes the characters are qualitative (e.g., texture). As the user makes a choice about a particular characteristic of an organism s/he is led to a new branch or couplet of the key. Each couplet provides characteristics that become progressively more specific until the final step is reached and identification is made.
What processes can transform metamorphic rock into sediment?
A.
weathering and erosion
B.
heat and pressure
C.
compaction and cementation
D.
crystallization and solidification
What processes can transform metamorphic rock into sediment?
A.
weathering and erosion
What is the source of a stream called?
A. Reservoir
B. Creek
C. Floodplain
D. Headwaters
Headwaters is the source of a stream.
What is Headwaters?A stream or river's headwaters are its starting point. They are situated at the farthest point from the water body's outlet or point of confluence. These mountainous and often forested regions are where two thirds of California's surface water supply is produced.
Although the physical, biological, and chemical characteristics of a river's headwaters can have a significant impact on its downstream flows, the size and strength of a river's flow are not always controlled by its origin.
All along the length of the body of water, there are creatures, sediments, minerals, pollutants, and other compounds that have either been added by runoff or are naturally present in these river sources.
Therefore, Headwaters is the source of a stream.
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What is the energy conversion that occurs in cellular respiration?
Chemical energy in glucose is converted to light energy.
Light energy is converted to chemical energy in glucose.
Energy in glucose is converted to packets of stored energy in the organism.
Packets of stored energy are converted to chemical energy in glucose.