The following statements which are true relative to laboratory glassware include the following below:
Some laboratory glassware, such as graduated cylinders and volumetric flasks, are relatively precise and are suitable for accurately measuring volumes in most scientific experiments.One should always use a device which has a total volume close to the volume being measured, for instance, a 10-ml pipette would be suitable for measuring a volume of 8.3 ml.A fluid volume in a pipette should be read from the bottom of the meniscus, not the top of the meniscus.What is a Erlenmeyer flask?This is also known as a conical flask or titration flask and it is a type of laboratory flask which is chiefly used for transport, storage, and mixing. It has a tapered shape which makes it unsuitable for a measuring instrument.
The fluid volume in a pipette should be read from the bottom of the meniscus, not the top of the meniscus so as to avoid error due to parallax which makes the measurement inaccurate.
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Name the labeled structure
Which fossil fuel needs to migrate into
pockets in order for humans to extract it
from the ground?
A. gold
B. aluminum
C. petroleum
D. uranium
Answer:
LA RESPUESTA ES LA C) PETROLEUM
Explanation:
LA C) ES PORQUE SEGUN YO ES DE ACUERDO EL TEXTO AUE HAS MANDADO EN TU TAREA
Which of the following are an advantage and disadvantage of hydrogen energy use?
Advantage: Hydrogen is easy to store.
Disadvantage: Hydrogen is scarce.
Advantage: Hydrogen allows for zero emissions.
Disadvantage: Hydrogen is difficult to store.
Advantage: Hydrogen is an efficient form of energy.
Disadvantage: Hydrogen allows for pollution to be emitted.
Advantage: Hydrogen fuel has established infrastructure.
Disadvantage: Hydrogen is scarce.
The following are an advantage and disadvantage of hydrogen energy use and is denoted as option B.
Advantage: Hydrogen allows for zero emissions.Disadvantage: Hydrogen is difficult to store.What is Hydrogen?This is an element with a atomic number of 1 and exists as a colorless flammable gas.
It has to be liquefied which is why it is difficult to store and allows for zero emissions which makes it a clean source of energy.
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what do we call the outer layer of the nucleas?
What happens to the trees in the taiga as global temperatures rise?
They grow bigger and use more resources.
They lose their needles in the winter.
They grow farther up the mountains.
They grow farther down the mountains.
Answer:
C
Explanation:
because they grow more than others time
At present, only a very small proportion of genetically modified foods must be labelled. Some consumer advocates are urging the federal government to label all foods that contain genetically modified material, so that consumers may choose whether to purchase them or not. What are you views?
Genetically modified material is safe it was proven a ton of times no need to worry sometimes its even healthier than normal food.
how can a mutation in a gene lead to a new trait in organism?
Answer: The mutation gene codes for a protein that causes a new trait.
Explanation:
Why are microorganisms used to produce enzymes?
If possible, focus on the production of pharmaceutical enzymes via microorganisms, but a general explanation is sufficient as well.
Microorganisms produce enzymes in order to break the macromolecules such as proteins and starches.
Why are microorganisms used to produce enzymes?
Microbial enzyme production occur to degrade natural polymers such as proteins, starches, or pectin. The microorganisms secrete the enzymes in order to extract nutrients from it.
So we can conclude that Microorganisms produce enzymes in order to break the macromolecules such as proteins and starches.
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The total number of individuals of a species worldwide
Answer:
8.7 million - plus or minus about a million
Explanation:
"The approach accurately predicted the number of species in several well-studied groups such as mammals, fishes and birds, providing confidence in the method
The Smokey the Bear campaign attempted to suppress and eliminate wildfires from forested areas altogether. Explain how fire suppression can negatively impact the health of a forest ecosystem?
A. Suppression allows weaker, more vulnerable trees that would have been weeded out by fire to survive.
B. Suppression leads to less diversity of tree species, so beetles spread more quickly between trees.
C. Suppression leads to equal/even-age stands of mature trees, which the beetles prefer.
1. Naturally occurring wildfires are most frequently caused by lightning
2. NATURAL forest fires can temporarily increase fertility of a region
3. burning process releases nutrients which then fertilize the soil.
3a. fire chemically converts nutrients bound in dead plant tissues and the soil surface to more available forms
3b. fire indirectly increases mineralization rates through its impacts on soil microorganisms (Schoch and Binkley 1986).
4. slash and burn process successfully clears land for agriculture and introduces fertilizing nutrients into the soil, leaving it in excellent condition to grow crops.
AP ENVIRONMENTAL SCIENCE
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Watch the first video below infection, which shows how SARS-CoC-2 infects and replicated inside human cells,
Identify the parts of the SARS-CoV-2 virus
7. Type the correct part of the virus,indicated by the number 7, in the space below.
__________________.
8. Type the correct part of the virus, indicated by the number 9, in the space below.
________________.
9. Type the correct part of the virus, indicated by the number 9, in the space below
_________________.
Question
HI how are you ?? I am fine what about you??
What does longitude tell you?
A. How far south you are
B. How far north you are
C. How high up you are
D. How far east you are
Answer:
D
Explanation:
longitude, coordinate system by means of which the position or location of any place on Earth’s surface can be determined and described.
if it is lined from north to south it measures east to west that is why i say d
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Saccharomyces cerevisiae is used in the making of all of the following EXCEPT ______
.yogurt
beer
bread
wine
Saccharomyces cerevisiae is used in the making of all of the above EXCEPT yogurt
What is Saccharomyces cerevisiae?Saccharomyces cerevisiae simply refers to those species of yeasts which is used in making beer, bread, wine et.c
So therefore, saccharomyces cerevisiae is used in the making of all of the above EXCEPT yogurt
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What is communal defense?
A. The group takes care of the old and young.
B. The group can defend each other and gang up on a predator when it comes to attack.
C. The group can leave behind those that harm the group.
D. The group shares food with each other.
Answer:
B
Explanation:
The group can defend each other and gang up on a predator when it comes to attack
Answer: B. The group can defend each other and gang up on a predator when it comes to attack.
What type of plants contain two cotyledon?
A. Dicots
B. Monocots
C. Unicots
D. Multicots
Answer:
A. Dicots
Explanation:
A monocot, which an abbreviation for monocotyledon, will have only one cotyledon and a dicot, or dicotyledon, will have two cotyledons.
Explain the scientific interpretation of the fossils found in the cradle of humankind.
The scientific interpretation of the fossils found in the cradle of humankind,
The Cradle of Humankind region comprises 15 major fossil sites, some of which date back 5-million years.
The name Cradle of Humankind reflects the fact that the site has produced a substantially large number of hominin fossils, some the oldest ever found, dating as far back as 3.5 million years ago.
How was the Cradle of Humankind formed?The Cradle of Humankind Site comprises a strip of a dozen dolomitic limestone caves including the fossilized remains of ancient forms of animals, plants and most notably, hominids. The dolomite in which the caves formed, started out as coral reefs flourishing in a worm shallow sea about 2.3 billion years ago.
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describe the effects of altitude and latitude on the distribution of biomes
Answer:
As latitude and altitude increase, biomes and vegetation change. Trees of tropical rainforests usually grow closer to the equator, while mosses and lichen of the tundra grow closer to the poles.
Latitude determines the amount of sunlight received. The amount of sunlight and the amount of moisture received determines the ecosystem or biome. Biomes are partly determined by altitude. More precisely, biomes are mainly determined by temperature and precipitation, and the altitude can affect both temperature and precipitation. The temperature drops as the altitude increases. This would alter the structure and composition of our biome.
A mother who is heterozygous for Huntington’s disease and a father who is heterozygous for Huntington’s disease want to have a baby. What genotypes and phenotypes are possible for their child? Mom ____ x Dad ____ Write all of the genotypes and phenotypes from the above Punnett Square in the space below. Genotypes: Phenotypes: Fraction: Percent: _________ _________ ________ ________ _________ _________ ________ ________ _________ _________ ________ ________ Procedure: (Recessive Genetic Disorder) 9. Cystic fibrosis is a genetic disorder that is caused by a defective RECESSIVE gene that causes the CFTR protein to be dysfunctional. If a person has 1 or 2 dominant genes, they are normal. If a person has 2 recessive genes, they have the disease. When this protein works incorrectly, chloride is not moved properly in the cell and results in mucous in various organs to become unusually thick and sticky. CF is typically diagnosed in infancy, but even with modern medical advances, life expectancy is usually less than 30 years. 10. What letters will be used for the genotypes of Cystic Fibrosis? a. Normal: ____ b. Cystic Fibrosis: ____ 11. What genotype does someone have if they are homozygous normal?____ 12. What genotype does someone have if they are heterozygous normal? ____ 13. What genotype does someone have if they are homozygous for Cystic Fibrosis? ____ Complete the following Punnett Squares: Mom Dad
For a person to develop Huntington's disease, he must be homozygous (HH) or heterozygous (Hh) for the dominant allele.
What are the possible genotypes and phenotypes?Huntington’s disease is a type of defective dominant disease. This means that any person having 1 or 2 defective dominant genes, have the disorder. But, if a person has 2 recessive genes, they are normal.
Mom (Hh) x Dad (Hh)
H h
H HH Hh
h Hh hh
Genotypes: HH, Hh, hh (1:2:1)Phenotype: Huntington’s disease, Normal (3:1)Genotypic percent: 25% HH, 50% Hh, 25% hhPhenotypic percent: 75% Diseased, 25% normalCystic fibrosis is a type of a recessive disease i.e., a person having 1 or 2 dominant genes is normal. But a person having 2 mutated recessive genes are diseased.
Normal: CC, CcCystic fibrosis: ccHomozygous normal: CCHeterozygous normal: CcHomozygous cystic fibrosis: ccLearn more about Huntington's disease here:
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Look on the box that says ‘show genotype’. What is the genotype of the offspring
One would expect well-drained soils to have the highest organic matter contents where the climate is?
One would expect well-drained soils to have the highest organic matter contents where the climate is cool and humid.
What is organic matter?Reducing or eliminating tillage, which triggers a microbial action burst that hastens the decomposition of organic matter and raises erosion. Reduce erosion by taking the necessary action. SOM is mainly found in topsoil.The topsoil is the soil's topmost layer. The majority of the biological soil activity on Earth takes place there because it has the highest concentration of organic materials and bacteria.The topsoil is where most of the biological activity in the soil takes place and has the highest concentration of organic matter and nutrients. Without residue or living cover, soil is vulnerable to erosion.Histosols are soils that are rich in organic materials and unbroken plant matter.
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What happens when a coral pushes out the algae that live there?
coral cooling
coral bleaching
algae bloom
coral warming
Energy is stored in biological molecules like carbohydrates, lipids and nucleic acids (ATP).
Describe how different forms of energy are converted at least three different ways in an autotroph.
ATP can be hydrolyzed to ADP and Pi by the addition of water, releasing energy. ADP can be "recharged" to form ATP by adding energy, combining with Pi in a process that releases a water molecule.
Where the energy of ATP?As energy is released, they form ATPs, binding phosphate to ADP. So the energy is in ATP. The process of binding phosphate to ADP is called oxidative phosphorylation.
There are three common energy-producing processes for making ATP:
The ATP-CP system, or phosphagen;Anaerobic glycolysis, or lactic acid system;The oxygen system.See more about ATP at brainly.com/question/14637256
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3. Which of the following structures is the only hard part of the rotifer and the only part that is usually found as fossils?
A: stomach
B: foot
C: corona
C: trophi
The structures which is the only hard part of the rotifer and the only part that is usually found as fossils is trophi and is denoted as option D.
What is a Fossil?This is defined as the remains of plants and animals preserved in the earth crust.
The jaw of organisms known as rotifers are the only part found in fossils and is also referred to as the trophi which is used for mastication.
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Answer:
D. trophi
Explanation:
The only hard portion of the rotifer's body is the trophi. This area is the only part that is usually found in the fossil records.
in 2016, Sub-Saharan Africa had a doubling time of 23.3 years.
calculate the growth rate
doubling time=70/ growth rate.
A. 4%
B. 3%
C. 5%
D. 2%
The correct answer is Option B: 3%.
In 2016, Sub-Saharan Africa, doubling time is 23.3 years, thus Growth rate is 3%.
What is doubling time?The doubling time is the time taken by a population to double in its size. This concept is applied to population growth, inflation, resource extraction, consumption of goods, the volume of malignant tumors, and many other things that tend to grow over time.There is an important relationship between the percent growth rate and its doubling time known as “the rule of 70”: to estimate the doubling time for a steadily growing quantity, simply divide the number 70 by the percentage growth rate.Therefore, Growth rate is 70 divided by doubling time (70/ doubling time).Here, Doubling time= 23.3 years. Growth rate= 70/23.3= 3%Learn more about population growth rate here:
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Most skin, hair, and nail fungal infections (including ringworm) are caused by ______.
Select one:
a.
dermatophytes
b.
viruses
c.
prokaryotes
d.
bacteria
Answer: it's a.
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what is the difference between pressure potential and solute potential and give the formula for water potential
Front legs of a cat and the arms of a human share a bone structure
Answer: It will be a homologous
Explanation:
Describe how an enzyme’s shape changes as it binds to its substrate. Describe a condition under which an enzyme might to be able to bind to its substrate.
The enzyme’s shape changes as it binds to its substrate because enzymes are highly specific, the main reason for enzyme’s shape changes as it binds to its substrate is temperature, pH and time.
Why an enzyme is so specific for its substrate?Is due to the fact that the enzyme's active site has a complementary format to its substrate, promoting a contract, like a key that fits perfectly in a given fixation.
Substrate is the reagent on which an enzyme acts. When an enzyme binds to its substrate, the enzyme-substrate complex is formed. This binding takes place in a specific region, called the active site.
One exemple of an enzyme changing it's shape to binds to a substrate is pepsine. Pepsine changes it's shape to bind to proteins in the stomach and break them down into smaller peptides.
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Mrs. Jones has noticed a student acting oddly and is concerned. He seems afraid, has had odd bruises, and does not want to go home after school. Mrs. Jones shared this information with the principal and he said he would “take care of it.” Mrs. Jones should ________.
The student must be under threat of bullying hence Mrs Jones ought to quiz the student to obtain more information.
What should Mrs. Jones do?The fact that the student is hanging around and refusing to do home after school implies that the student must be under some kind of threat which has denied the student the freedom to go home.
What Mrs Jones ought to do is to take care of the bruises on the student and then quiz the student to obtain more information.
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pls help i dont get it question is above
Answer:
A. Cell wall and chloroplast
B. Nucleus (the dark grey circle)
Explanation: