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Svetllana [295]
3 years ago
14

Define virus and virion, and describe the parts of a virion.

Biology
1 answer:
leva [86]3 years ago
6 0

Answer:

A virus is a tiny infectious biological agent that can only replicate or duplicate inside the host cell. These infectious agents can infect all different types of living organisms ranging from animals and plants to microorganisms and archaea and bacteria.

Virions are ineffective particle or form of the virus outside of the host cell, with RNA or DNA and a protein capsid.

The main role of these infectious agent virions is to transfer the DNA or RNA genome from itself to the cell of host and expressed the gene which means produce proteins from the genome transferred to the host cell.

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Both birds and mammals have four-chambered hearts. but birds are more closely related to crocodiles, which have three-chambered
Mashutka [201]
Birds and mammals independently evolved four-chamber hearts  
6 0
3 years ago
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What is the complementary base sequence of the DNA strands of the template strand reads TTGCACG
Nadya [2.5K]

So there are four types of nucleotides in DNA:

  1. Adenine
  2. Cytosine
  3. Guanine
  4. Thymine

And the complements are:

  1. Adenine ⇄ Thymine
  2. Cytosine ⇄ Guanine

<u>Using this information, the complementary base of TTGCACG is AACGTGC.</u>

3 0
3 years ago
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Question 2 of 9
Jlenok [28]

Answer:

The correct answer is option D.  Light and some other factors are necessary for chlorophyll production

Explanation:

By this experiment, it is clear that light is the major factor that helps in the production of chlorophyll in seedlings or plants. In this study, placing the seeds in the light turns 75 seedlings green which is possible by the production of the green pigment, chlorophyll only. So, it is proved that light is a key factor in the production of chlorophyll.

Besides light, there must be some other factors (mineral nutrition and chemical metabolites) that also play role in the production of chlorophyll or increase or decrease of the chlorophyll production as few seedlings did not turn green in the study.

8 0
3 years ago
Why are shell of marine snails heavier than garden snails?
const2013 [10]
They have to have a higher density than water to have the ability to stay on the sea floor. Otherwise they would just float to the surface of the water
6 0
3 years ago
In a nucleotide, which would change based on the genetic code of the organism?
Setler79 [48]

Answer:

The correct answer is nitrogen base

Explanation:

The nucleotide sequence of one codon differ from that of another codon by the presence or absence of specific nitrogen base.The nucleotide sequence of different codons contain different nitrogen bases.

       As a result change in genetic code result from the change in the nitrogen bases of the codons present in the genetic code.

  In simple words change in single nitrogen base of a codon will change the entire codon.

6 0
3 years ago
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