"We should NEVER keep volatile solvents, like ether, acetone, or benzene in an open beaker or Erlenmeyer flask because vapors can ignite and flash back if they reach a flame.
All BUT ONE safety precaution is necessary when using volatile solvents."The necessary safety precaution when using volatile solvents that is not needed is: Using a volume of the solvent that is more than 100 mL.When using volatile solvents like ether, acetone, and benzene, the safety precautions that should be taken include the following:Wear proper PPE, such as safety glasses, gloves, and a lab coat.Keep the solvent container closed when it is not in use.Store solvents in designated flammable solvent cabinets.Keep volatile solvents away from any heat or open flames.Never heat volatile solvents with a Bunsen burner.
This can cause a fire.When handling volatile solvents, make sure there is proper ventilation in the laboratory. This can be achieved by using a fume hood.Use only small volumes of the solvent. If more than 100 mL is used, it can be dangerous to the user. Always ensure that the solvent is used in an area free of any ignition sources, including hot plates, Bunsen burners, and open flames.
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Fears of malpractice lawsuits are playing a part in the increased use of expensive diagnostic equipment. T F
Answer:
True.
Explanation:
True, Fears of malpractice lawsuits are playing a part in the increased use of expensive diagnostic equipment.
Hope this helps!
Scientific developments have made forensic science a stronger discipline.
True
False
Answer:
Answer of this qurstion is true
PS: PLEASE DO NOT PUT A LINK I AM NOT GOING TO OPEN THE LINK IN THE ANSWER SECTION!!
what are the improvements in human society that have allowed the human population to increase in size exponentially? (choose all that apply)
a. agriculture
b. cleanliness
c. industry
d. medicine
Answer:
medicine................
Answer:
a. agriculture
b.cleanliness
d. medicine
Explanation:
took the test! :)
Match the items in column B with the descriptive statements in column A Column A Column B 1. structure that suspends the small intestine from the posterior body wall a anus b. appendix C. circular folds d. esophagus e. frenulum f greater omentum 9. hard palate h. haustra i. ileocecal valve j. large intestine k. lesser omentum I mesentery m. microvilli n. oral vestibule o. Peyers patches p. pharynx q. pyloric sphincter r. rugae 2. fingerlike extensions of the intestinal mucosa that increase the surface area for absorption 3. large collections of lymphoid tissue found in the submucosa of the smal intestine 4. deep folds of the mucosa and submucosa that extend completely or partially around the circumference of the small intestine 5. mobile organ that manipulates food in the mouth and initiates swallowing 6, conduit for both air and food 7, food passageway that has no digestiverabsorptive function 8. folds of the gastric mucosa 9 pocketike s of the large intestine 10. projections of the plasma membrane of a mucosal epithelial cell 11. valve at the junction of the small and large intestines 12, primary region of nutrient absorption 13. membrane securing the tongue to the floor of the mouth 14. absorbs water and forms feces 15. area between the teeth and lips/cheeks 16. wormlike sac that outpockets from the cecum 17. initiates protein digestion 18. structure attached to the lesser curvature of the stomach 19. covers most of the abdominal organs like an apron 20. valve controlling food movement from the stomach into the duodenum 21. posterosuperior boundary of the oral cavity 22. region containing two sphincters through which feces are expelled from small intestine t· soft palate u stomach v. tongue the body 23. bone-supported anterosuperior boundary of the oral cavity
Structure that suspends the small intestine from the posterior body wall and valve controlling food movement from the stomach into the duodenum
1. k. lesser omentum, 2. m. microvilli, 3. o. Peyers patches, 4. C. round folds, 5. v. tongue, 6. d. throat, 7. a. rear-end, 8. r. rugae, 9. h. haustra, 10. I. ileocecal valve, 11. j. digestive organ, 12. p. pharynx, 13. e. frenulum, 14., q. pyloric sphincter, 15. n. oral vestibule, 16. b. reference section.
17. f. more noteworthy omentum, 18. u. stomach, 19. 1. structure that suspends the small digestive system from the back body wall, 20. 1. structure that suspends the small digestive system from the back body wall, 21. 9. hard sense of taste, 22.
23. bone-upheld anterosuperior limit of the oral cavity, 23. 9. pocketlike sacs of the digestive organ, Segment A gives distinct explanations about different physical designs and works, while section B contains the comparing replies.
For instance:
- The design that suspends the small digestive system from the back body wall is replied by 1. structure that suspends the small digestive tract from the back body wall, which relates to the lesser omentum (k).
- Fingerlike augmentations of the gastrointestinal mucosa that increment the surface region for retention are replied by microvilli (m).
- Enormous assortments of lymphoid tissue found in the submucosa of the small digestive system are Peyers patches (o).
- Profound folds of the mucosa and submucosa that expand totally or somewhat around the boundary of the small digestive system are round folds (C).
By coordinating the things in segment A with the comparing depictions in section B, the connections between the physical designs and their capabilities can be perceived.
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Which is characteristic of the sympathetic division of the autonomic nervous system?
a]stimulates digestion
b]dilates the bronchi
c]slows the heart rate
d]converts glucose to glycogen
What type of graph is used for a PH test
Which of the following experimental approaches is least likely to be used in identifying transcription factor binding sites?
a. Electrophoretic-mobility shift assay
b. Northern blotting
c. DNA footprinting
d. Chromatin immunoprecipitation
Northern blotting is the least likely to be used in identifying transcription factor binding sites. Therefore, option "B" is correct. Northern blotting is used for the analysis of RNA in the given sample. The samples can be tissue, blood, and serum.
The RNA is purified from the given sample. The sample might contain fragmented RNA which is purified and amplified. The target RNA is separated by using an electric current. The RNA moved through the gel which act like a sieve-like matrix. The movement of the fragments depends on the size of the fragments. Smaller fragments move faster than larger ones in Northern blotting.
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A male peacock's tail is an adaptation to increase his chances of
A)survival
B)finding food
C)getting a mate
D)standing out in a crowd
Answer:
D
Explanation:
That is a form of copulatory behaviour in peacocks
Answer:
C) getting a mate
Explanation:
A male peacock's tail is a adaptation to attract other peacocks
Even more Explanation:I took the USA TEST PREP assignment and got it correct. the answer below or above me is wrong. trust me
Why are antibiotics unhelpful for treating the common cold?
A. Colds are caused by bacteria.
• B. Antibiotics attack only bacteria.
• C. Antibiotics cannot treat disease.
D. Colds are caused by antibiotics.
B. Antibiotics attack only bacteria.
How might biology help you to better understand environmental issues?
Answer:
An understanding of biology can help you make choices and decisions that affect your health. Biologists and other scientists research environmental issues such as pollution, biodiversity,land conservation, and natural resource use.
Explanation:
Hope this helped Mark BRAINLIEST!!!
4.
What is the salinity of seawater?
1.5 percent
3.5 percent
10 percent
5.5 percent
Answer:
I think the answer is 3.5%
Explanation:
35 parts per thousand of seawater contains salt therefore your answer is 3.5
Compared to the inertia of a 1-kilogram mass, the
inertia of a 4-kilogram mass is
A. 16 times as great
B. 1/16 as great
C. 1/4 as great
D. 4 times as great
please help.
Answer:
D. 4 times as great
Explanation:
The inertia of an object is the resistance offered by the object to change in its motion or position.
Then concept of inertia is obtained from Newton's first law of motion which states that an object which is not subjected to any net external force will remain its position of rest or constant velocity of motion until some net external force acts on it. The object at rest will then start to move whereas the object moving at constant velocity will experience a change in its speed or direction of motion.
This reluctance to change position is greater, the more massive an object is as well as the higher the speed of motion of the object. Thus, inertia is directly proportional to the mass of the object as well to the velocity of an object in motion.
From Newton's first law, inertia can be calculated as the force to be overcome to mobile an object, i.e. Inertia = F = ma
Where m is mass of object, a = acceleration of the object.
Objects on the earth's surface experience a constant acceleration, g.
Thus for a 1 kg mass, Inertia = 1 × g
For a 4 kg mass, inertia = 4 × g
The inertia of a 4 kg mass is four times as great as a 1 kg mass.
The inertia of a 1-kilogram mass, the inertia of a 4-kilogram mass is - D. 4 times as great
Inertia is the property of matter that resists changes in motion. Mass is the quantitative matter of motion.
Mass is that quantity that is solely dependent upon the inertia of an object.The more inertia that an object has, the more mass that it has.A more massive object has a greater tendency to resist changes in its state of motion.Thus, the inertia of a 1-kilogram mass, the inertia of a 4-kilogram mass is - D. 4 times as great.
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Referring to the illustration below, answer the following questions:
a. What process is represented here?
b. How do you know? (Give two reasons.)
c. Is the parent cell a somatic cell or a gamete? (Think before writing your answer!)
d. What is the end result of this process?
e. How similar or different are the daughter cells from one another? If they are different, explain why.
The genetic material in each daughter cell is identical to that in the parent cell, and the process of mitosis ensures that each daughter cell receives a copy of each chromosome.
a. The process represented here is cell division. b. The reasons why this process is cell division are:
1. The parent cell is dividing into two daughter cells.
2. The daughter cells are genetically identical to each other. c. The parent cell is a somatic cell. It is not a gamete because gametes are produced by meiosis, not mitosis. d. The end result of this process is two genetically identical daughter cells. e. The daughter cells are genetically identical to each other. They are the same because they are produced by mitosis, which involves only one round of cell division and results in two daughter cells that are genetically identical to each other. The genetic material in each daughter cell is identical to that in the parent cell, and the process of mitosis ensures that each daughter cell receives a copy of each chromosome.
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PLSS HELP
What is NOT an adaptation that pioneer species need? *
A. ability to do photosynthesis
B. live without soil
C. the ability to grow tall
D. tiny roots to break down rock
Explanation:
Primary succession, type of ecological succession (the evolution of a biological community’s ecological structure) in which plants and animals first colonize a barren, lifeless habitat. Species that arrive first in the newly created environment are called pioneer species, and through their interactions they build a simple initial biological community. This community becomes more complex as new species arrive. Primary succession is distinguished from secondary succession, which is the recovery of an existing biological community after a disturbance sets back the community’s ecological structure to an earlier stage.
identity the function of the cell membrane. what is the function of the cell membrane? please explain
does this an suggest evolutionary relationship? explain how these embryos can be used as evidence of a common ancestor between each of these six organism
Answer:
Examination of vertebrate embryos reveals that during corresponding stages of early development,
the embryos appear to be very similar. For example, all vertebrate embryos pass through stages in
which they have gill pouches. The pouches eventually develop into the gill apparatus in fish; in laterevolving vertebrates that do not have gills, the gill pouches undergo further refinement and develop
into structures associated with the head and neck. Similarly, all early vertebrate embryos have tails,
which persist in some animals but regress during the later stages of development of humans. Thus,
the individual development of an animal occurs through a series of stages that paint a broad picture
of the evolutionary stages (phylogeny) of the species to which it belongs.
"Ontogeny recapitulates Phylogeny", Haeckel
Explanation:
sure po ito
Examination of vertebrate embryos well-known shows that in corresponding levels of early improvement, the embryos appear very similar.
For example, all vertebrate embryos by skip thru levels in which they have got gill pouches. The pouches subsequently turn into the gill equipment in fish; in later evolving vertebrates that don't have gills, the gill pouches go through similar refinement and develop into systems related to the pinnacle and neck. Similarly, all early vertebrate embryos have tails, which persist in a few animals however regress at some point in the later levels of improvement of humans.What is ontogeny recapitulates phylogeny?These scientists claimed that ontogeny recapitulates phylogeny (ORP). This word shows that an organism's improvement will take it thru every one of the personal levels of its evolutionary history, or its phylogeny.
Thus, the man or woman improvement of an animal happens thru a chain of levels that paint an extensive picture of the evolutionary levels (phylogeny) of the species to which it belongs.
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ASAP!! HELP ME WITH THESE pls :(
Question 1.Which moon phase starts and ends in the moon cycle?
Question 2 : How many days between each moon phase ?
Answer:
1. new moon
2. seven
Explanation:
:)
Answer:
there are 4 important phase. full moon is the first phase and new moon is what it ends.
it takes 27days between each moon phase
the growth of plant seedlings is usually
A.phototropic and gravitropic
B.thigmotropic and gravitropic
C.phototropic and influenced by ethylene
D.gravitropic and influenced by ethylene
Answer:
The correct answer is - A. phototropic and gravitropic.
Explanation:
A plant seedling grows usually two-direction shoots or stems towards light and roots towards the soil or in the direction of gravity. The movement of the plant toward a specific stimulus or effect parts is called tropism and different parts move in a different direction.
The movement of the roots of the plant is usually towards the direction of soil or gravity and this is called gravitropic. The shoot or stem grows from the seedling towards the direction of light and it is called phototropic.
Assume you saw biofilm formation on the negative control slide. What could account for such an observation? A You left the slide to incubate for too long. B The crystal violet dye was contaminated. с You used non-sterile slides or filter paper.
If biofilm formation is observed on the negative control slide, it could be due to either leaving the slide to incubate for too long (Option A) or using non-sterile slides or filter paper (Option C).
In biofilm experiments, the negative control is expected to show no biofilm formation since it does not contain the target microorganisms or conditions necessary for biofilm growth. If biofilm is observed on the negative control slide, it suggests that something went wrong during the experimental procedure. Option A suggests that the slide was left to incubate for too long, allowing unintended microbial growth and biofilm formation. Option C suggests that non-sterile slides or filter paper were used, introducing microorganisms or contaminants that can form biofilms. Both scenarios result in the presence of biofilms on the negative control slide, indicating a procedural error or contamination issue.
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Which statement is true of the adaptive, but not the innate, immune system?
Choose 1 answer:
A. Many cells work together to coordinate the response.
B. It involves the use of lymphocytes.
C. It fights both viruses and bacteria.
D. The receptors are highly specific.
Answer: The receptors are highly specific.
Explanation: yes
Answer:The receptors are highly specific
Explanation:
just took the quiz :)
ANSWER QUICK PLZ
The photo shows several Volvox, one of the simplest multicellular living things. Volvox have no tissues.
What other three things do Volvox also likely lack?
Answer:
A, B, D.
Explanation:
Look at the chart below to answer this question. Which substance is the LEAST dense of the three substances?
Substance A
Substance B
Substance C
Answer:
Substance B
Explaination: Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn’t depend on the amount of substance.
The tendency of a cell or an organism to maintain a stable internal environment is known as _______.
A.
homeopathy
B.
homology
C.
homogeneous
D.
homeostasis
Distinguish between natural selection and artificial selection.
Answer: Natural selection is based on the adaptive characteristics of animals. Artificial selection is based on the desirable characters selected by humans. Only beneficial or favorable traits are inherited over the successive generations by natural selection. Natural selection is performed on all the types organisms; Artificial selection is processed on some selective organisms of humans desires. ... Natural selection results in the transformation of the entire population of a species; Artificial selection brings out the new variety of that species.
Explanation:
Answer:
answer in explanation
Explanation:
Natural selection occurs over a long period of time and happens naturally. artificial selection happens relatively fast and occurs when humans choose a certain trait they like and help the animal with that trait reproduce.
The immune response generates some side effects that can be unpleasant. what their potential benefits could be?
The ability to recognize, respond to, and remember a variety of pathogens.
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What property of silver may discourage people from buying silver jewelry?
A. it can’t float
B. it’s not green
C. it can tarnish
D. it’s not transparent
Answer: C
Explanation: Because if silver is tarnished it will lose its luster, thus making it not attractive.
The primers you used in lab amplified 145 base pairs that were adjacent, but not included in the repeat. If you used a different primer that only amplified 130 base pairs adjacent to a 14 base pair repeat, and you had 4 repeats in your product, what was the size of your final PCR product?
186
214
158
200
172
Answer:
186
Explanation:
The Polymerase Chain Reaction (PCR) is a technique used in molecular biology to amplify small segments of DNA. This technique uses a pair of oligonucleotide sequences called 'primers' which bind to opposite strands of the heat-denatured DNA template in order to amplify this target DNA sequence. In this case, the DNA template is composed of a single unit of 130 base pairs (bp) and four repetitive units of 14 bp, so the final PCR product will have 186 bp >>> 130 bp + (14 bp x 4) = 130 + 56 = 186.
When a small square is sectioned off for study and the plants, animals, and other organisms in that section are counted, the study is called a:______
When a small square is sectioned off for study and the plants, animals, and other organisms in that section are counted, the study is called a quadrat sampling.
Quadrat sampling is also referred to as quadrat study. In ecological research, it is a method used to determine the number or density of organisms in a certain specific area.
It involves dividing the study area into smaller, equally sized plots or squares called quadrats. The size of the quadrat depends on the organisms being studied and the scale of the research.
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explain how inbreeding dogs for good or perfect trait also produces bad or disease traits as well
Answer:
Inbreeding can cause a weaker dog from inbreeding it will not be as immune to stuff that non inbreed dogs would be if that makes since.
Explanation:
I know this cuz my gramps shows and breeds dogs and i breed goats. If you don't get it tell me in the comments.
Inbreeding depression can produces bad or disease traits as well.
Inbreeding between two closely related species can result in the expression of lethal recessive allele which are otherwise masked by dominant allele.These recessive gene allele can code for certain diseases which are otherwise eliminated by outbreeding.What is inbreeding depression?It is the reduced survival and fertility of offspring of related individual.It is often the result of population bottleneck.To know more about inbreeding depression here
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ALL MATTER HAS THE SAME PROPERTIES.
A. True
B. False
Answer:
false
Explanation:
some don't
Answer:
FALSE
gases and solids and liquids all have very different properties, thats not even mentioning plasma and BEC
Explanation:
thanks for the opportnity sir