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malfutka [58]
3 years ago
14

!!!!PLEASE HELP 21 POINTS!!!! Describe how hibernation has helped bear species survive

Biology
1 answer:
IceJOKER [234]3 years ago
6 0
Since there isn't much prey during winter, the bears have to eat a lot of the remaining prey and then go into sleeping, so that they will not go through the whole winter without food.
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There is about 1,000 times as much DNA in a human cell as in a bacterial cell, but only 5 times as many genes. What accounts for
chubhunter [2.5K]

Answer:

Phenotypic plasticity

Explanation:

Humans have evolved over thousands of years to adapt to various environmental changes. For example, when we are in an environment that requires certain level of adaptation our off spring often formalizes epigenetic traits that lows them to overcome small changes in the environment. Over time certain genes that are turned on may remain on and eventually the ones that are off remains off. This give rise to some genes that "don't work"  after millions of years of such evolution we end up with a complex genome with more DNA than "working genes".

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3 years ago
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If the cell body of a pns neuron survives when an axon is damaged, axon filaments can extend peripherally from the injured site
Julli [10]
The statement above is TRUE.
The peripheral extension of an axon filament from an injured site toward an original target is an example of axonal regeneration. Axon regeneration in the matured mammalian central nervous system is very limited after injury. But axonal regeneration is still possible in some instances such as the one given in this question.
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3 years ago
What types of traits can show genetic variation within a species?​
natta225 [31]

Answer:

Types of variation in genetics

Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring)

other answer

There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population. Because of this, mutations are usually selected against through evolutionary processes

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3 years ago
The definition of distillation is to _______. (1 point)
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The answer is A it's the action of purifying water
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2 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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3 years ago
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