Answer:
c
Explanation:
pure substances
Pure Aluminum foil, distilled water, NaCl (table salt), and Gold Bar (pure Au) All of these may be classified as pure substances. Therefore, option C is correct.
What are pure substances?Pure substances are substances that are made up of only one type of particle, either atoms or molecules and have a constant composition throughout.
They cannot be broken down into simpler substances by physical means, such as filtering or distillation. Examples of pure substances include elements, which are composed of only one type of atom, and compounds, which are composed of two or more different types of atoms chemically combined in a fixed ratio.
Pure substances have well-defined physical and chemical properties, such as melting and boiling points, that can be used to identify them. Thus, option C is correct.
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What would happen to your weight on the moon?
How does a good experimental conclusion differ from an inference?
Hunter-gatherer societies had the benefit of _____.
A. knowledge of the environment
B. sophisticated tools
C. good farming techniques
D. their understanding of germs
Answer: A
Hunter gatherer societies had the benefit of knowledge about the environment. This society includes the obtaining food from collecting wild plants and wild animals. They follow the wild animals for meat. They do not have knowledge of agricultural practices. They do not rely on agricultural societies. They do not have any understanding about germs.
which of these descriptions correctly defines the term dna
Which of these things is the most contaminated with bacteria?
Toilet seat.
Kitchen sink.
The most bacteria is present in kitchen sink.
Explanation:In the place of kitchen sink there is an amount of around 100,000 times more bacteria as in comparison with the toilet seat. You should wash away the sink from hot water use for killing away the bacteria.
unlike prokaryotic cells, ukaryotic cells have the capacity to
According to the textbook, what role does the stomach play in feelings of hunger?
a. pressure receptors in the stomach walls signal fullness or emptiness.
b. fullness receptors and stomach contractions both play a role.
c. stomach contractions signal the brain that it is time to eat again.
d. pleasure receptors within the lower intestine, not the stomach walls, signal fullness or emptiness.
The stomach contributes to feelings of hunger through both fullness receptors and stomach contractions. When these receptors are not activated, due to an empty stomach, the feeling of hunger is experienced. However, pleasurable receptors in the lower intestine do not contribute to the signal of hunger, rather they signal satisfaction after eating.
Explanation:According to textbooks, the stomach plays a key role in the feelings of hunger via both fullness receptors and stomach contractions. When the stomach is empty, fullness receptors are not activated, which allows for the sensation of hunger. This is statement 'b' in your provided options. Additionally, physical stomach contractions also signal the brain that it's time to eat again, which can intensify feelings of hunger. The lower intestine does contain pleasurable receptors, but their role is mainly to signal satisfaction after eating, not hunger itself.
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Earthquakes and volcanic eruptions are examples of rapid events that are caused by the movement of Earth's _______. Mountain building is a much more slow process, which is caused by the movement of Earth's _______.
Answer:
Crustal plates; crustal plates
Explanation:
Geology considers that the mountains are recent formations, so they did not suffer as much wear and tear through exogenous relief modification agents as the action of winds and rains. The mountains are commonly formed by the action of crustal plates (or tectonic plates), which collide and generate folds or uplifts on the surface.
Most volcanic eruptions and earthquakes are the result of tectonic plate movement. When they recede or collide, magma tends to rise in the case of volcanoes, or the earth tends to tremble in the case of earthquakes. Depending on the force of the pressure exerted, the volcano is "uncapped" and erupts.
Structurally, vertebrae form __________ joints connected by intervertebral discs.
Larry has an extremely stressful job and comes home every day with an upset stomach and a headache. he says he'll just have to deal with it for now, so he takes aspirin and stomach acid reducers on a daily basis. larry is in the ___________ stage of the general adaptation syndrome (gas).
Answer:
resistance stage
Explanation:
The water lost during transpiration is a side effect of the plant's exchange of gases. however, the plant derives some benefit from this water loss in the form of question 7 options:
a.mineral transport
b.evaporative cooling
c.evaporative cooling and mineral transport
d.increased turgor save
*For animal anatomy* The diaphragm is ______ to the stomach. a) dorsal b) rostral c) ventral d) cranial
The correct anatomical term for the position of the diaphragm in relation to the stomach is dorsal, meaning it is nearer to the back or spine side of the body.
Explanation:In terms of animal anatomy, the correct positional term for the relationship between the diaphragm and the stomach would be dorsal. The diaphragm is dorsal to the stomach. This means that the diaphragm is toward the back, or spine side of the body when compared to the position of the stomach. Other options like rostral, ventral and cranial don't correctly describe this anatomical relationship. Rostral refers to the towards the head end, ventral indicates towards the belly side and cranial refers to towards the skull or head.
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Sienna decides to study movement in plants. Identify the correct sequence of the scientific steps, and place the steps in order. She developed a hypothesis that plants move toward light.Over six weeks, both plants grew toward their available light source. She put one plant near the window and another in a dark room with a small opening that let light come through.Every few days she checked the plants and recorded the direction of their growth.
Why are scientists most likely working on developing cleaner-burning fuel for cars?
The part of the brain that is known as the interpreter is the ________ hemisphere because it ________.
The answer is A. The left brain is also called the interpreter. This part of the brain processes information and endeavors to make sense/ rationalize the situation based on past experiences. This was discovered in the split-brain research by Roger Sperry in 1970s.
Toxins like α-amanitin are used for research in much the same way as null mutants−to disrupt a process and see what happens when it no longer works. researchers examined the ability of α-amanitin to inhibit different rna polymerases. they purified rna polymerases i, ii, and iii from rat liver, incubated the enzymes with different concentrations of α-amanitin, and then tested their activity. the results of this experiment are shown below. these findings suggest that α-amanitin-treated cells will have reduced levels
What does your data indicate about the rate of cell division in cancerous tissue compared to the rate of cell division in normal tissue? what data did you use to answer this question?
In the deep waters of the ocean, coral reefs are found in abundance. Algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. The corals offer shelter to the algae. So, they share a association. Climate change has led to increased temperatures and has caused the corals to throw away the algae living inside them. This action causes the corals to be bleached because of a lack of pigment. This change will lead to . NextReset
In the deep waters of the ocean, coral reefs are found in abundance. Algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. The corals offer shelter to the algae. So, they share a mutualism association. Climate change has led to increased temperatures and has caused the corals to throw away the algae living inside them. This action causes the corals to be bleached because of a lack of pigment. This change will lead to a decrease .
An established cereal manufacturer is being investigated by the ftc for claims that its oatmeal can repair damaged arteries and prevent heart disease. its executives are aware that if the claims are found to be false, the firm may receive the ftc's most severe penalty, which involves:
Sofia wants to help take care of dolphins and other sea mammals which field of study would be most useful to her
Answer:
Marine Biology
Explanation:
Sofia must study marine biology if she intends to take care of marine animals like dolphins and other sea mammals. She can then enter into the specialization of marine biology known as Ichthyologists where study and research are conducted specifically on fish and sharks. Marine biology will help her to understand the anatomy of these animals in depth and also the internal metabolic/physiological processes. She can also guide people like aqua trainers and caretakers in taking care of these animals properly.
Where is the start codon located? where is the start codon located? in the dna just upstream of where transcription starts at the upstream end of the 3' untranslated region (utr) at the downstream end of the 5' untranslated region (utr) at the very start (5' end) of the mrna?
In eukaryotes, the size of the primary transcript is generally ________ the gene in the template dna strand. see section 17.2 (page 353) .
The right of workers to seek safety and health on the job without fear of punishment is spelled out in: A. Section 11 (c) of the OSH Act B. All state laws C. The General Duty Clause D. The Equal Employment and Opportunity Act
Answer:
Option A, Section 11 (c) of the OSH
Explanation:
In the Section Occupational Safety and Health Act of 1970 , also known as OSH Act employees are given protection against the termination of their job contract (job security on the mere issues of raising a health and safety issue with the employer or participating in inspection drill of OSHA, or complaining against the employer with OSHA team under the jurisdiction of OSHA Act.
Hence, option A is correct
The nitrogen removed from an amino acid generates ammonia, which is converted to ________ and excreted in the urine
Ammonia, produced from the deamination of amino acids, is highly toxic and is converted into urea in the liver. Urea is then excreted in the urine by mammals, including humans, as part of the urea cycle to maintain nitrogen balance and prevent toxicity.
Explanation:The nitrogen removed from an amino acid generates ammonia, which is then converted to urea and excreted in the urine. When proteins are broken down into amino acids, they undergo deamination, where the nitrogen-containing amino groups are removed and form ammonia (NH3), which is converted into the less toxic compound, urea, primarily in the liver. This process is vital for detoxifying ammonia, and the urea produced is then excreted by the kidneys. Mammals, including humans, excrete primarily urea, with small amounts of ammonium ion (NH4+), through urine. This urea formation and excretion is part of the urea cycle, an efficient system to remove nitrogenous wastes from the body, which is essential for maintaining the body's nitrogen balance and preventing the accumulation of toxic levels of ammonia.
What color changes did you observe when you added Sudan solution to water?
The side chain of ________ has a pka in the physiological ph range and is therefore often involved in proton transfer during enzymatic catalysis.
Final answer:
Histidine, with a pKa of around 7, is the amino acid whose side chain is most often involved in proton transfer during enzymatic catalysis due to its ability to exist in both protonated and deprotonated forms at physiological pH.
Explanation:
The side chain of histidine has a pKa in the physiological pH range and is therefore often involved in proton transfer during enzymatic catalysis. The pKa of the protonated histidine residue is approximately 7, which allows histidine to exist in both protonated and deprotonated forms within physiological conditions. This unique property makes it an ideal candidate to act as proton donor-acceptor groups in the active sites of enzymes. Histidine is commonly found in such roles in biochemical reactions because enzymes rely on the specific protonation states of amino acid residues to properly function.
brittle solid dull or shiny poor thermal conductor may conduct electricity ductile The properties listed here should be added to the section of the Venn diagram in the center, where you see the asterisk. What would be the title for this section? A) alloy B) metalloid C) faux metal D) rare Earth element
What is the difference between a fossil with original preservation and an altered hard part
Answer:
Organic matter produced when an organism is alive remains unchanged in unaltered fossil while the opposite happens in cases of altered fossil
Explanation:
When the organic material produced by an organism during the time period when it was alive remains unchanged in the given course of time then it is termed as unaltered or original preservation. for example - bones, teeth etc, remain intact.
While in case if the organic material produced by an organism during the time period when it was alive changes in due course of time by the external forces is called as altered fossil
The most leaching of minerals occurs from the ____________________ horizon into the ____________________ horizon.
A 14 year-old status post injury over one year ago to her left wrist presented with recurrent wrist pain. the patient was taken to the operating room and placed under general anesthesia. she was placed in wrist traction. the radiocarpal joint was entered endoscopically through sharp skin incisions and blunt dissection into the joint. there was found to be mild synovitis in the dorsal ulnar aspect of the wrist. this was debrided arthroscopically with a shaver. there was a peripheral tear of the triangular fibrocartilage. this area was shaved to promote healing. using outside-in technique, a pds suture was placed across the tfcc and into the capsule. there was synovitis within the midcarpal joint, but there was no articular injury. all instruments were removed and the wounds were closed with interrupted nylon sutures. what cpt® code(s) is /are reported?
It either lighter than the ventral or darker than the ventral