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dezoksy [38]
3 years ago
9

Dna is double stranded helix, connected by what could be described as "ladder rung" are actually nucleotides, the building block

s of dna. a sequence of three of these nucleotides is known as a codon. codons are important in the composition of proteins, because each codon calls for a specific __________.
Biology
1 answer:
Norma-Jean [14]3 years ago
4 0
Each codon codes for a specific amino acid.
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Hoochie [10]
It’s symmetrical if it’s equal on both sides?
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List the galaxies in order from closest to Earth to farthest from Earth.
Ede4ka [16]

Answer:

1st)     Sagittarius Dwarf Elliptical Galaxy

2nd)    Virgo Stellar Stream

3rd)     Canis Major Dwarf

4th)     Milky Way Galaxy  

Explanation:

8 0
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Find beryllium (Be) on the periodic table. In the space below, draw a Bohr model of beryllium atom.
lbvjy [14]
Make a electron cloud and put 2 dots on the first layer and 7 on the outer layer
7 0
3 years ago
Match the following for the following questions: Part Aa. Secretes b. Regulatory c. Hormones d. Supports Body and Anchors e. Mus
RoseWind [281]

Answer: (The question is incomplete) The human body is made up of different organs. An organ is a group of tissues in a living organism that have been adapted to perform a specific function. The different organs in the body can work together to perform a similar function. These groups of organs performing a common function constitutes an organ system. For example, the circulatory system which is responsible for transporting blood throughout the body, consists of the heart and blood vessels known as veins, arteries and capillaries.

Explanation:

The hypothalamus which is part of the endocrine system organ synthesizes and <em>secretes regulatory hormones.</em>

The skeleton which is part of the Skeletal system <em>supports Body and Anchors Muscle.</em>

The blood which is part of the Circulatory (cardiovascular) system transports <em>substances throughout the body including the heart. </em>

The respiratory system exchanges Oxygen and CO₂ between body and air.

The Muscular system is an organ system consisting of muscles which <em>permits movement of the body.</em>

The immune system of the body <em>defends the body against diseases</em>.

The lymphatic system functions to keep body fluid levels in balance and to defend the body against infections. <em>It includes thymus and spleen.</em>

The excretory system <em>rids body of liquid waste</em>. It includes the skin, the kidney and urethra, the bladder, and two ureters.

The digestive system which includes the stomach, the liver, anus, large and small intestine,e.t.c, <em>breaks down food and absorbs nutrients. </em>

The nervous system <em>processes sensory information and controls responses. It includes the brain & spinal cord which form a part of the nervous system called the central nervous system </em><em>(CNS)</em>

3 0
2 years ago
Cichlids, a type of fish, were introduced to a lake around 200 years ago. Over the years, the fish have developed into two disti
alina1380 [7]

Answer:

sympatric speciation

Explanation:  

Different sympatric species have the same closest ancestor and live in the same area but inhabiting different niches.

The steps for sympatric speciation are:

  1. An ancestral species inhabit a geographic area.
  2. With time, different populations of the same species occupy different niches or microhabitats in this general area.
  3. As the microhabitats are different, they have different environmental pressures that are acting on each population.
  4. These pressures lead to the origin of differences between groups, which need to adapt to each environment
  5. Each population suffers genetic changes due to environmental conditions. These changes are inheritable.
  6. With time, these differences drive to the final complete divergence of populations, becoming different species and reproductively isolated.

In sympatric speciation, the interruption of genetic flow must be fast, and there must be differences in niches so no species can compete and displace the other species. <em>Speciation occurs in the same distribution area of the original species</em>. The new species originate in a place with no physical barriers but different environmental pressures.

In the exposed example,

  • <em>The introduced Cichlid fishes 200 years ago</em> → Original species and the common ancestor between the new derivated species
  • <em>The lake</em> → general geographic area
  • <em>The main lake and the streams</em> → Microhabitats or niches with different pressures each
  • <em>The groups are splitting into two genetically and physically different types of fishes. They do not mate. There is no genetic flow between groups.</em> → Speciation process.
7 0
3 years ago
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