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nekit [7.7K]
4 years ago
7

A student is investigating cellular transport. She fills a beaker with 250 ml of water. She places 10 drops of red food coloring

into the beaker of water and makes an observation immediately, after 5 minutes, and after 30 minutes. Her set up is shown below. image The student observes that the molecules of red dye move from an area of higher concentration to an area of lower concentration until equilibrium is reached. Which best describes the type of cellular transport that the student is investigating? A The student is investigating the passive transport of diffusion. B The student is investigating the active transport of osmosis. C The student is investigating the active transport of diffusion. D The student is investigating the passive transport of osmosis.

Biology
1 answer:
Vera_Pavlovna [14]4 years ago
6 0

Answer:

The correct answer is A The student is investigating the passive transport of diffusion.

Explanation:

Diffusion is a type of transport process which helps in the transport of small molecules and gases towards their concentration gradient that"s means from region of high concentration to the low concentration region untill equilibrium is reached.

       In this question the 10 drops are red coloured food particles that are placed into the beaker, diffuses to all the regions of the beaker untill the concentration of that red colored food particle become same in all the regions to which red colored food particle diffuse.

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What is the correct sequence of events along an axon that follows a membrane reaching threshold potential?
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As sodium ions diffuse inward, sodium channels open.

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8 0
1 year ago
In fruit flies, curved wings (w) are recessive to the dominant straight wings (W), and ebony body (b) is recessive to the domina
lara [203]

Answer:

The correct answer =

parents : WwBb x wwbb

offspring :

WwBb, Wwbb, wwBb, and wwbb

Explanation:

It is given that the straight wings (W) is dominant over curved wings (w) and the ebony body (b) is recessive to the dominant gray body (B) and there is a cross between curved wings and ebony body and straight wings and gray body is made. The phenotypic ratio is: 1:1:1:1 for the four different phenotypes straight gray, straight ebony, curved gray, curved ebony.

It is not given the genotype of parents, however, for the curved and ebony fly, it is clear that both alleles are recessive as recessive alleles only appear in absence of the dominant allele of the trait.

For another parent, the possible genotypes can be  WWBB or WwBb, however in the case of WWBB the phenotypic ratio would not be equal therefore,

crossing WwBb x wwbb

This can be represented in the form of a punnett square as below:

          wb   wb           wb           wb  

WB WwBb WwBb WwBb WwBb Straight wing, Gray body

Wb Wwbb Wwbb Wwbb Wwbb Straight wing, Ebony body

wB wwBb wwBb wwBb wwBb Curved wing, Gray body

wb wwbb wwbb wwbb wwbb Curved wing, Ebony Body

The phenotypic ratio is: 1:1:1:1 for the four different phenotypes

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2 years ago
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