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3 years ago

) is every minimum bottleneck tree of g a minimum spanning tree of g? prove or give a counter example

1 answer:

mote1985 [20]3 years ago

5 0

The answer is false. To explain further, let G have vertices {v1, v2, v3, v4}, with ends between each pair of vertices, and with the mass on the edge from vi to vj equal to I + j. Then each tree has a bottle neck edge mass of as a minimum of 5, so the tree containing of a track through vertices v3, v2, v1,v4 is a least bottleneck tree. It is not a least spanning tree, though, subsequently its total mass is greater than that of the tree with edges from v1 to every single vertex.

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FRAMESHIFT mutation. Explain what this means and how it affects the protein

babymother [125]

Explanation:

frameshift mutation is a type of mutation involving the insertion or deletion of a nucleotide in which the number of deleted base pairs is not divisible by three. ... Each group of three bases corresponds to one of 20 different amino acids used to build a protein.

genome dot gov

7 0

3 years ago

Why do scientist prefer to use food webs over food chains

Troyanec [42]

Food Webs show how plants and animals are connected in many ways to help them all survive. Food Chains just follow just one path of energy as animals find food.
So the answer is: Scientists prefer the usage of food webs over food chains due to the fact that food webs are more elaborate and more detailed than the food chain.

6 0

3 years ago

In quiet breathing (A) inspiration is passive and expiration involves muscular contractions. (B) inspiration and expiration invo

Zolol [24]

Answer:

In quiet breathing inspiration involves muscular contractions and expiration is passive.

Explanation:

Respiration process involves two different stages, inspiration - inhalation- and expiration - exhalation-.

During inspiration, the diaphragm contracts and goes down, while intercostal muscles also contract and go up. These actions enhance the size of the thoracic box and reduce internal pressure. As a result, air flows in and fills the lungs.

During expiration, the diaphragm relaxes and the volume of the thoracic box diminishes, which causes the pressure inside to increase. In consequence, the lungs contract and the air is expulsed outside.

8 0

3 years ago

3. When did reptiles first appear in the fossil

dexar [7]

Answer:

Explanation:

Reptiles arose about 310–320 million years ago during the Carboniferous period.

4 0

3 years ago

A research group has discovered an organism with cells that contain a previously undescribed organelle. They do some tests on th

Vlad [161]

Answer:

The suitable option will be - B

Citric acid cycle

Explanation:

The results were -

Glucose: None

CO2: Increase

O2: None

ATP: Increase

NADH: Increase

We know that the Citric acid cycle is also known as the TCA cycle (tricarboxylic acid cycle) or the Krebs cycle. This cycle occurs in Mitochondria in case of eukaryotes. In this cycle acetyl-CoA is oxidized which comes from carbohydrates, proteins and fats and energy is released in the form of ATP.

water is also used in this process. NAD+ gets reduced to NADPH. In this system carbon dioxide is produced as a waste byproduct. ATP is produced as the main product. ATP is also used as a source of energy.

6 0

3 years ago