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3 years ago

Discuss the causes and effects of veld fire and suggest practical solutions

Biology

1 answer:

Nady [450]3 years ago

5 0

Answer:

In explanation.

Explanation:

Causes: most veld fires are a result of human actions that emanate from the disposal of cigarettes, the burning of vegetation when preparing fields, the use of fire by hunters, smoking out bees and the making of fires by motorists along highways.

Effects: land management and sustainability posed by veld fires include property damage, reduced soil fertility, destruction of vegetation, air and water pollution, and destruction of wildlife.

Practical solutions:

1. Prepare fire breaks on their side if there is a reasonable risk of veld fires.

2. Have the necessary equipment, protective clothing, and trained personnel to extinguish these fires.

3. Avoid throwing cigarettes butts on the ground.

4. Have grass beaters handy to extinguish the fire.

5. Always have the emergency number handy to call emergency services 10177 on Telkom landlines or 112 on your cellphones.

6. Sand can be a very effective method of veld fire control since water will not be readily available.

7. Visit your nearest Basic Emergencies, Safety And Fire (Besafe) center for more information on fire safety education.

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3 years ago

A certain restriction enzyme digest results in DNA fragments of the following sizes: 4,000 bp, 2,500 bp, 2,000 bp, and 400 bp. S

Paladinen [302]

Answer:

Smaller the size of the DNA fragment, farther it moves during electrophoresis. The sketch of the position of the fragments has been drawn in the figure below.

Explanation:

As we know DNA is a negatively charged molecule. So during electrophoresis the fragments move towards the positive electrode because opposite charges attract each other.

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In the question there are four DNA fragments with base pairs 4000, 2500, 2000 and 400 so the smallest segment with 400bp will be farthest from the starting point and the largest fragment with 4000bp will travel least distance in the gel medium. Their respective positions are shown in the figure below. The starting point is near the negative electrode.

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3 years ago

Given that polyurethane is a huge polymer (mw >>?????????,????????? daltons), why is it important that the polyurethanase

Viefleur [7K]

Polyurethanase is an enzyme emitted by the microorganism so as to break polyurethane. Since the polymer is a significant wellspring of energy for the life form, it should be separated all together for etpum"s development.

Further details

Polyurethane

It is a polymer made out of organic units and carbamate links join them. While most polyurethanes are thermosetting polymers that don't liquefy when warmed, thermoplastic polyurethanes are likewise accessible. Polyurethanes are available in numerous parts of present-day life. They present a class of polymers that have discovered a far-reaching use in the medical and mechanical fields. Polyurethanes can be found in items such as furniture, coatings, cement, constructional materials, paints, elastomers, filaments and paddings. Polyurethane ought to be curtailed to PUR in consistence with authority German and International benchmarks.

Polyurethanase

It can be defined as such an enzyme which is secreted by microbes and used for the breakdown of polyurethane. In this breakdown process energy is released that is utilized by microorganisms.

Bio-degradation of Polyurethane

In spite of their microbial obstruction, polyurethane is attacked by microscopic organisms however the component to explain its bio-degradation is unknown. There are reports from microscopic organisms and parasites that are equipped for the breakdown of polyurethane yet the examinations about the proteins that assault the plastic are centered around bacterial compounds as it were. The enzyme is of sort esterase and protease for the most part since these chemicals are unspecific and can perceive a few regions in the polyurethane particle and hydrolyze it.

Answer details

Subject: Biology

Level: College

Keywords

Polyurethane
Polyurethanase
Bio-degradation of Polyurethane

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5 0

3 years ago

Read 2 more answers

What type of molecules movement requires cells to expend energy

Tanzania [10]

Answer: Active transport

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3 0

3 years ago

Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele.

VashaNatasha [74]

Answer:

a. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.

Explanation:

Tay-Sachs, which is a recessive lethal disease ---- Let say the recessive lethal diseases is s

∴ it only results when an individual posses two copies of the diseases-causing allele i.e two copies of the disease will be ss.

Now, when two hetrozygous individuals crossed , it is obvious that each can pass on their copy of the disease-causing allele to the offspring.

Let show an illustration for the above statement.

Let the heterozygous individual be Ts, if Ts cross with another Ts;

we will have:

Ts × Ts

T s

T TT Ts

s Ts ss

the offspring are TT,Ts,Ts,ss

We can now see how the Heterozygous individuals pass on their copy of the disease-causing allele to the offspring (Ts).

8 0

3 years ago