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2 years ago

Compare transport in animals and plants cells

Biology

1 answer:

docker41 [41]2 years ago

6 0

Answer:

Transport in both plants and mammals is by a system of specialised tubes. ... In mammals this forms a circulatory system of arteries, capillaries and veins. In flowering plants, transport is not circulatory and occurs in microscopic xylem and phloem.

Explanation:

Mammals:

ºSpecialised tubes - arteries, capillaries and veins.

ºAll tubes are composed of living cells.

ºThe concentration of substances transported is controlled (see homeostasis). The ºconcentration of the substances being transported is not controlled.

ºThe heart controls the circulatory system. The heart is controlled by the nervous system.

ºThe rate of flow is moderate and is regulated by vasoconstriction and vasodilation.

ºUses water as a medium in which to transport substances (it is a good solvent, it has a high specific heat capacity, has good surface tension but is not viscous, and is unreactive).

º The substances being transported are: respiratory gases, glucose, amino acids, fatty acids, glycerol, vitamins, minerals, hormones.

Plants:

º Specialised tubes - xylem vessels and tracheids and phloem sieve tubes.

º Some tubes are composed of living cells, e.g. phloem. Others are composed of dead cells, e.g. xylem.

º The concentration of the substances being transported is not controlled.

º There is no such control in plants.

º The rate of flow in the xylem and phloem is quite slow. The rate of flow in the xylem is controlled by external factors via the stomata (e.g. temperature, wind, humidity).

º Uses water as a medium in which to transport substances.

ºSubstances being transported are: sucrose, amino acids, fatty acids, glycerol, vitamins, hormones (in the phloem) and minerals and water (in the xylem). Respiratory gases are not transported by this system but move via a series of inter-connecting air spaces.

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This type of membrane transport moves substances against the concentration gradient from an area of low concentration to an area

sashaice [31]

Answer:- Active transport

Explanation:-

There are two types of membrane transports

1. Passive transport - this type of transport occurs without the input of any energy and the molecules move along the concentration gradients that is from high concetration to low concentration.

2. Active transport- this type of transport takes place to move the molecules against the concentration gradient that is from low concentration to high concentration.

The active transport is of two types:

1. Primary active transport- in this type of transport ATP is used as an energy source to move the substances against the concentration gradient.

2.Secondary active transport - in this type of transport the gradient formed by the active transport is utilized and it involves the movement of 2 substances at a time aross the membrane. That is the movement of one molecule is coupled to another.

The membrane proteins that are associated with active transport are called as carrier proteins. These proteins have a binding site for the molecules that they transport. Once they bind to the specific molecules, a conformation change is induced and this leads to the transport of the molecule across the membrane.

So, the active transport is basically responsible for utilizing the energy from ATP and carrier proteins to move the substances across the membrane against their concentration gradient i.e. from low concentration to high concentration.

5 0

2 years ago

Acetic acid and ethanol react to form ethyl acetate and water, like this: (aq)(aq)(aq)(l) Imagine of are removed from a flask co

ehidna [41]

Answer:

Greater than zero, and equal to the rate of the reverse reaction

Explanation:

this is an incomplete question in the first place, i saw the complete format online hence the answer am giving here.

Before any C2H5CO2CH3 is or was removed, the system is said to be in equilibrium.

This means that the rate of consumption of reactants and rate of generation of products are greater than zero and are equal, that means that both the forward and backward reactions are occurs at these rate.

7 0

3 years ago

The initiation of transcription requires melting of the DNA double helix, i.e. separating hydrogen-bonded base pairs, immediatel

sertanlavr [38]

Answer:

The correct answer is B. DNA helicase first unwinds the double helix around the +1 site.

Explanation:

The helicase is an enzyme that specifically breaks the hydrogen bonds of the bases in the transcription process. As E. Coli is a prokaryote, then, the transcription only occurs in one point of the circular DNA. The promoter region indicates where the DNA polymerase has to start replicating and the Topoisomerase unwinds the parts of the DNA that are being excessively twisted because of the separation of the two strands.

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3 years ago

What organisms save water by turning carbon dioxide into a special carbon compound before carrying out photosynthesis?

larisa [96]

The correct answer is C4 plants.

A plant that cycles carbon dioxide into four-carbon sugar components to get into the Calvin cycle is known as a C4 plant. These plants are very effective in dry, hot climates and produce ample energy. Various foods one consumes are C4 plants like pineapple, corn, and sugar cane.

In the C4 plants, at the start carbon fixation occurs in the mesophyll cells and the Calvin cycle occurs in the bundle-sheath cells. The PEP carboxylase combines with an incoming molecule of carbon dioxide to the three carbon-molecule PEP, generating a four carbon molecule, that is, oxaloacetate.

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3 years ago

7 ways that invasive species affect the environment

seropon [69]

Invasive species reduce biodiversity levels, create a nuisance, cause economic loss, and disrupt ecosystem equilibrium.

<h3>Effects of invasive species</h3>

Invasive species tend to drive away or kill native species.
Invasive species reduce the overall biodiversity of plants or animals in the ecosystem.
They cause economic loss through the loss of important native species.
They create nuisance in the environment and may be costly to get rid of.
They affect ecosystem equilibrium by causing species change.
They are usually difficult to manage.

More on invasive species can be found here: brainly.com/question/21452505

#SPJ1

6 0

2 years ago