An experiment was conducted to demonstrate the passage of glucose and starch across a selectively permeable membrane that allows monomers but not polymers to diffuse through.
Glucose and starch powders were mixed in 10 ml of water and poured into a cellulose bag, which was then sealed at both ends and placed in a beaker of water. After 30 minutes, the presence of glucose in the beaker was recorded with a testing paper, which turns green if glucose is present. The presence of starch was recorded by adding a few drops of iodine, which causes the solution to turn violet if starch is present.
A beaker filled with 100 milliliters of distilled water. A bag filled with 10 milliliters of water and a solution of 2 percent glucose and 2 percent starch is placed in the beaker of water.
Which statement best describes the expected result?
A) The testing paper will turn green and the solution will turn violet.
B) The testing paper will turn green and the solution will not turn violet.
C) The testing paper will not turn green and the solution will turn violet.
D) The testing paper will not turn green and the solution will not turn violet.
Answer:
B
Explanation:
because if you read the first paragraph, the membrane will only allow monomers not polymers. glucose is a monomer and starch is a polymer. so the membrane will only take glucose and the color for glucose therefore the color is only green.
Which population is most likely to have exponential growth?
O A. The dust mites living in a sofa that is often used and never
cleaned
B. The angelfish living in a coral reef where there are many sharks
C. The mice living in a meadow with plenty of predators and limited
food
D. The foxes living in a forest where they compete with other animals
for food
Answer:
A. The dust mites living in a sofa that is often used and never cleaned
Explanation:
Without the sofa being cleaned, the dust mites will never experience any predation or die off from humans and harsh cleaning chemicals. This will enable the population to increase exponentially, as opposed to the other options where the organisms are at risk for ample predation and starvation.
Exponential growth refers to the growth of organisms in an environment having unlimited resources. The organism grows exponentially or in a geometric fashion.
The dust mites living on the sofa that is often used and never cleaned.
The population has high chances of exponential growth will be:
1. Exponential growth is seen in the environment or surroundings where the resources are plentiful, and the number of organisms is dependent on those resources.
2. The dust mites living in the sofa that has never been cleaned will show exponential growth. Since the sofa is never cleaned, the mites have never faced any elimination by chemicals. The population will increase exponentially.
3. The other options have chances of competition, starvation, and predation that will not lead to the exponential growth of organisms.
Thus, the correct answer is Option A.
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will the heat stored in the blood’s plasma be able to escape easily?
This might be the last one I don’t remember.
I will mark branliest if correct.
Answer:
Carries food from the mouth to the stomach.
Explanation:
The esophagus is the tube in which chewed food travels after you swallow. It is directly connected to the mouth and the stomach.
Answer:
carries food from mouth to stomach.
Primer design is a critical step for the detection of a particular sequence in a sample. Which of the following would be true of primer design?
The group of choices is as follow:
A. RNA polymerase are added to the PCR mix to design random primers
B. If detecting viral infection by PCR, the primers must not be complimentary (match) to regions of human DNA
C. Pairs of primers must be designed, one to start amplification with Taq polymerase, the other to start amplification with human polymerase
D. Primers are optional if you want to amplify all DNA within a sample
Answer:
The correct answer is - B. If detecting viral infection by PCR, the primers must be complementary to regions of human DNA.
Explanation:
Short, single-stranded segments of DNA sequences utilize in the real-time PCR or polymerase chain reaction technique are called primers. Primers used to hybridize the region of the segment needed to be amplified.
The human polymerase enzyme is not used in the PCR reaction and requires a 3'OH group to synthesize the DNA by amplification which is possible only in the presence of primers as they have a 3'OH.
How are oxygen and nitrogen molecules different from the water molecules?
Answer:
i dont know it is correct or not. sorry if it is wrong
Explanation:
hey are completely different! An oxygen molecule consists of two oxygen atoms bonded to each other. They each have one unpaired electron, not used in the bonding. These unpaired electrons make the molecule diamagnetic. Water molecules have one ox...
oxygen and nitrogen molecule consists of two oxygen atoms bonded to each other and same nitrogen atoms are bonded of each other.
Water molecules have one oxygen atom in the center and two hydrogen atoms, one on each side.
what are the properties of water molecule ?It has no taste, odor, or transparency, where the nucleus of the oxygen atom attracts electrons strongly than the nuclei of the hydrogen atoms.
In water molecule oxygen is more electro negative and electron-greedy than hydrogen, results in the development of a partial negative charge on the oxygen of the water and a partial positive charge on the hydrogen end.
Water shows strong cohesive property where the attraction of molecules for other molecules of the same kind is referred to as cohesion.
Surface tension is defined as the tendency of the surface to resist rupture when they are subjected to stress due to cohesive forces.
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can someone explain what three of newton’s laws are and please give example? I am currently failing because of this subject
Answer:
Newton's First Law of Motion states that in order for the motion of an object to change, a force must act upon it. This...
Newton's Second Law of Motion defines the relationship between acceleration, force, and mass.
Newton's Third Law of Motion states that any time a force acts from one object to another, there is an equal force...
Explanation:
WHAT IS THIS PLEASE HELP!!!
Answer:
Carbon
Explanation:
When the sun impacts weather, an interaction with the __________ takes place.
atmosphere
biosphere
geosphere
hydrosphere
Answer:
Hydrosphere
Explanation:
When the sun impacts weather, an interaction with the hydrosphere takes place. The hydrosphere is the part of the earth that is enveloped by water. Water exists in three different forms on the earth based on diverse factors.
Weather is the atmospheric condition of a place over a short period of time.
The sun causes the warming of the earth surface which leads to evaporation of water vapor into the atmosphere.
This water in the atmosphere is forms rainfall, one of the elements of weather.
The sun causes an impact on weather by causing evaporation of water into the atmosphere.
This interaction takes place in the hydrosphere.
In a longitudinal wave, the parts where the coils are close together are called what.
Answer:
The answer is compressions.
Explanation:
A compression is a region in a longitudinal wave where the particles are closest together. Hope this helped :)
Answer: compressions
Hope this help :)
What are the three types of homologies and the definitions?
Answer:
hope this helps..
Explanation:
Dependent on the level of comparison four types of homology are defined: ( 1) Iterative ( = serial = homonomy), (2) ontogenetic, (3) di- or polymor- phic, and (4) supraspecific homology. ... Scientists have recently been paying renewed attention to the homology question.
Homology is the study of likeness, the similarity between species that results from inheritance of traits from a common ancestor. The study of similarities is broken up into three main categories: structural, developmental, and molecular homology.
the phosphate groups are the polar part of the phospholipid because they are:
9. All of the following statements about the scientific name for an organism are true EXCEPT
A. the genus name is listed first
B. the name is two words
C. the species name is listed second
D. the kingdom name is listed first
Answer:
D. the kingdom name is listed first
Explanation:
The genus name is listed first, not the kingdom name. The kingdom name isn't even is the scientific name.
How does energy change from one form to another?
Answer:
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another.
Explanation:
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. For example, to heat a home, the furnace burns fuel, whose chemical potential energy is converted into thermal energy, which is then transferred to the home's air to raise its temperature.
Energy changes from one form to another by:
Energy transformationEnergy transformation, is the primary method through which energy is converted from one form to another.
There are different forms of energy such as:
Mechanical energyElectrical energyChemical energy, etc.As a result of this, we can see that chemical energy can be converted to electrical energy through the means of energy transformation
Therefore, the correct answer is energy transformation
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the phenomenal having lowest acidity is
Answer: Alcohols are considered neutral with pKa values similar to water. In aqueous solutions, phenols are weakly acidic and lower the pH of a solution
Explanation:
Are hexane and cyclohexane isomers? Why or why not?
Answer:
No, they are not isomers
Explanation:
"The molecular formula of cyclohexane is C6H12 while of hexane, it is C6H14. The isomers are those molecules which have same molecular formula. Hence on this bases, the above two are not isomers"
If, somehow, the number of daylight hours did not change throughout the year, but Earth
was still tilted at 23.5°, would there still be seasons in the Northern and Southern
Hemispheres of Earth? Would the temperature difference between the seasons still be as
great? Explain your reasoning.
Answer:
There would still be seasons, because the intensity of light would still change throughout the year, due to the earth's tilt.
Explanation:
If, somehow, the number of daylight hours did not change throughout the year, but Earth was still tilted at 23.5° then-
Yes, there would still be seasonsNo, the temperature difference between the seasons would not be as greatThe tilt of the Earth's axis at 23.5° leads to the different parts of the Earth to gets a high or less amount of direct sunlight at different times of the year.
If there would be no tilt of the earth then there would be no seasons on Earth.If the number of daylight hours did not change then seasons still be there due to the intensity of light would still change throughout the year as the earth is still tilted. If the number of daylight hours did not change throughout the year then the temperature difference would not be as great due to less light in the daytime will not be able to heat enough and the Earth would not be heated for a longer time in summer.Thus, the correct answer is -
Yes, there would still be seasonsNo, the temperature difference between the seasons would not be as great.Learn more about the earth's tilt:
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Which pair of organism represents a predator prey relationship
Answer:
Explanation:
hawk and mouse
Answer:
Coyote and Rabbit. Coyote will eat the rabbit. (See more down below.)
Explanation:
Bear (Pred) will snatch up a fish (prey) out of a river. Bear and Fish.
Lion (Pred) eats a Zebra (prey) after a successful hunt. Lion and Zebra.
Killer Whale(Pred) catches up to seal (prey) and eats seal. Killer Whale and Seal.
A house cat (Pred) finds a mouse (prey). Cat and Mouse.
5 natural causes of climate change
Answer:
The Greenhouse EffectPollutionFossil FuelsDeforestationVolcanic ActivityExplanation:
Hope this helps! <3
Sugar-based preserves, jams, and jellies were less likely to experience: O Mold O Bacterial growth O Both mold and bacteria O Spoilage
Answer:
both mold and bacteria.
Explanation:
Answer: Bacterial Growth
Explanation: I know its probably like, super late but for anyone who needs the answer this is it!!
What is a result of a mixture?
Ok here is the next one. The answer selected was just accidentally tapped so ignore it lol.
Answer:
hm, i believe it's d...but i'm not 100% sure lol
Explanation:
hope it helps!
Which monosaccharides make up sucrose?
Which shows a correct association between a structure and one of its functions? Pores receive sensory information. Oil regulates temperature. Vitamin D protects against bacteria. Sweat glands remove waste
Answer:
D
Explanation:
Sweat Glands remove waste
The sweat glands that eliminate wastage represent the right association between the structure and one of the functions
.
What is a sweat gland that eliminates waste?The sweat represents the fluid that comprises of mainly of water also there is much dissolved solid wastage that should be excreted via the sweet glands. It eliminates the excess water and salts also it served the function of colling the body at the time of thermoregulation.
Therefore, The sweat glands that eliminate wastage represent the right association between the structure and one of the functions
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What does the cardiovascular system do?
carries hormones for the endocrine system
transports oxygen and carbon dioxide for the respiratory system
sends nerve impulses to the brain and spinal cord
carries nutrients for the digestive system
works with the immune system to fight infection
Answer:
transports oxygen and carbon dioxide for the respiratory system
Explanation:
Which of the following relationships is incorrect
Chloroplast is not a site of lipid synthesis, it is the site of performing photosynthesis Therefore, option A is correct.
What are chloroplasts and their functions?An organelle found in the cells of plants and some algae called a chloroplast is where photosynthesis, the process by which solar energy is transformed into chemical energy for growth, takes place.
All green tissues in plants and algae contain chloroplasts in their cells. In photosynthetic tissues that don't appear green, such as the brown blades of gigantic kelp or the red leaves of some plants, chloroplasts are also present.
Thus, the cell wall provides support and protection to the cell, rough ER is the site of protein synthesis, the nucleus holds genetic material, and the chloroplast is the site of photosynthesis. Therefore, option A is correct.
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Crust is created at which type of plate boundary?
Answer:
At convergent boundaries
Explanation:
"continental crust is created and oceanic crust is destroyed as it subducts, melts, and becomes magma."
Hope this helps!!
Which statement best describes the relationship of photosynthesis and energy?
The process of photosynthesis is energy-storing because the process converts light energy into chemical energy,
which is stored in the bonds of glucose.
The process of photosynthesis is energy-releasing because the process converts light energy into free energy that
can be used for cell functions.
The process of photosynthesis is energy-conserving because no energy is used throughout the process of forming
glucose and oxygen molecules.
The process of photosynthesis is energy-wasting because photosynthesis is an inefficient process that depletes the
cell of energy stored in the bonds of glucose.
Answer: The process of photosynthesis is energy-conserving because no energy is used throughout the process of forming glucose and oxygen molecules.
Explanation: Plants create glucose through sunlight for food, which conserves energy
In soreflies (a hypothetical insect), the dominant allele, L, is responsible for resistance to a common insecticide called Loritol. Another dominant allele, M, is responsible for the ability of soreflies to sing like birds. A true-breeding mute, Loritol-resistant sorefly was mated to a true-breeding singing, Loritolsensitive sorefly, and the singing, Loritol-resistant female progeny were testcrossed with true-breeding wild-type (i.e., mute, Loritol-sensitive) males. Of the 400 total progeny produced, 119 were mute and Loritol-resistant, 114 could sing and were Loritol-sensitive, 81 could sing and were Loritol-resistant, and 86 were mute and Loritol-sensitive. Do you think the (L) and (M) gene loci are linked or unlinked? Justify your answer
Answer
The (L) and (M) gene loci are linked.
Explanation:
Due to some technical problems, you will find the complete explanation in the attached file named Linked genes.
What is the main function of the cell membrane of a cell?
A. To organize the cell's internal contents
B. To limit the size that the cell can reach
C. To protect the cell from harmful substances in the environment
D. To exchange nutrients and the cell's wastes with the external
environment