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4 years ago

There is more than one kind of balance used in the laboratory.

Biology

2 answers:

Anton [14]4 years ago

6 0

The answer is true. There are more than one balance used in labs.

Oxana [17]4 years ago

3 0

Answer:

The correct answer is "T" True.

Explanation:

There are different kind of balances that could be found in the laboratory according to the amount of material that needs to be weighted. The most widely used is the analytical balance which can measure as low as 0.1mg. However, there are specialized analytical balances that can measure up to 0.005 mg. Other kind of balance found in laboratory are the toploading balances, which measure as low as 20 grams and up to 64 kg.

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Describe how ions, water and sugar are obtained and transported through plants. 6 mark

Alona [7]

Answer:

Water and ions are obtained from soil and glucose is obtained from leaves.

Explanation:

Water and ions are absorbed by the plant through roots from the soil whereas glucose is produced in the leaves during the process of photosynthesis. Vascular bundles such as xylem and phloem transported water, ions and glucose within the body. Xylem moves water from roots to the upper water of plants such as leaves, stem etc whereas phloem transported glucose from leaves to other parts of plant.

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3 years ago

In a ____ circulatory system, fluid is pumped through specialized, enclosed vessels.

mart [117]

Answer: B. Closed

In a closed circulatory system is the one in which the blood is circulated to all the parts of the body of the organism through vessels of different length and width. In this system the blood is pumped from the heart through blood vessels where it is transported to different organs and cells of the body instead of filling up the body cavity.

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4 years ago

Read 2 more answers

A student isolates a protein from anaerobic bacteria and analyses the protein by polyacrylamide gel electrophoresis containing S

elixir [45]

Answer:

The correct answer is option D.

Explanation:

In the presence of SDS single band appeared, while in the absence of SDS two bands appeared. SDS or sodium dodecyl sulfate refers to an anionic detergent, which combines with amino acid side chains providing the protein a net negative charge. It dissociates the non-covalent bonds.

In SDS-PAGE, the separation of proteins takes place on the basis of their molecular weight. Options A and B are incorrect as only in the presence of SDS, the separation of protein subunits takes place. Option C is also incorrect as a protein containing distinct molecular weight cannot show single band.

Option D is correct as the presence of SDS supplements a bunch of negative charges to the protein, thus, charge is not the factor. Therefore, the proteins are distinguished on the basis of the molecular weight. Thus, identical molecular weight demonstrates a single band. In the non-presence of SDS, charge performs a function along with the molecular weight, therefore, two bands appear.

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3 years ago

Why are viruses referred to as obligate fuasites?

Elena L [17]

Answer:

b. They cannot reproduce outside of a host cell.

Explanation:

Viruses are parasitic organisms that need a host in order to thrive and reproduce. This means that they cannot replicate outside of a host cell, but can only do this by parasitizing it. They have to find a host cell in order to continue their life-cycle or else they won't thrive. The word "obligate" means being restricted to a specific mode or function in life. This shows that the virus has a restriction when it comes to reproduction. It cannot reproduce without finding a host cell.

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3 years ago

_____evolution occurs when organisms share a trait that originated in an

I am Lyosha [343]

Answer: =Convergent evolution

Explanation: Convergent evolution occurs when organisms share a trait that originated in an ancestor but changed over time in different populations.

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3 years ago