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Ymorist [56]
3 years ago
7

Using the book as a model (section 39.2, "Aminoacyl-tRNA Synthetases Have Highly Discriminating Amino Acid Activation Sites" and

"Proofreading by Aminoacyl-tRNA Synthetases Increases the Fidelity of Protein Synthesis", page 714 in third edition), explain how an alanine tRNA synthetase might prevent the incorrect addition of the similar amino acids glycine and valine to its target tRNA.
true or false
Biology
1 answer:
alina1380 [7]3 years ago
7 0

Answer:

True!

Explanation:

Hope it helped...Please mark brainliest. Have a nice day!

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Mitosis makes reproductive cells
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An early winter frost preventing further growth in a tomato garden is an example of a. carrying capacity.
sveta [45]

Answer:

b. a limiting factor

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Which type of cell contains DNA enclosed in a nucleus?
goblinko [34]

The answer is  :

B. A eukaryotic cell's nucleus contains the DNA or the genetic material of the cell.

The DNA  has the necessary information for the cell's construction and the control of the synthesis tasks done by the cell. The nucleus is protected by the nuclear membrane. It surrounds the nucleus with a membrane with many pores.

Explanation:

The nucleus is a membrane-enclosed organelle located in most eukaryotic cells. The nucleus is the largest organelle in the cell and includes most of the cell's genetic information (mitochondria also contain DNA, called mitochondrial DNA, but it proceeds up just a small portion of the cell's overall DNA content. Inside its fully enclosed nuclear membrane, it contains the preponderance of the cell's hereditary material. This material is designed as DNA molecules, along with a family of proteins, to form chromosomes.

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3 years ago
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Which blood vessels permit the exchange of oxygen, carbon dioxide, nutrients, and waste products with body cells?
Greeley [361]

Answer: Capillaries

Explanation: Blood vessels have the same basic structures used to circulate blood of different composition to and away from the heart to the body. Blood vessels are arteries, veins and capillaries. Arteries carry oxygenated blood from the heart to the body and veins carry deoxygenated blood from the tissues to the heart.

Capillaries are the ones that work with body cells for exchange.They collect nutrients and oxygen from the blood to the cell and also collect carbon dioxide and waste from the cell to the blood which is transported to the vein where it travels via the venous system and goes through the heart, then to the lungs for gaseous exchange.

Therefore the enswer is, capillaries.

8 0
3 years ago
What forms volcanoes? (plate tectonics)
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The Earth’s crust is composed of enormous sections of rock called tectonic plates. Tectonic plates resemble puzzle pieces which move constantly against each other. Volcanoes often form in the areas where tectonic plates make contact. The friction created between two plates by the constant movement melts the Earth’s crust, causing the rock underneath the crust to turn into magma due to the great temperatures created by friction.


The now molten hot rock or magma creates great pressure, and over time, it finds its way through the fractures in the plates. Once magma reaches the surface of the Earth, it is called lava. Approximately 1500 volcanoes around the world are considered active, and from these, nearly 90% lie in the Ring of Fire, which is a ring of oceanic volcanoes circling the Pacific Ocean.


Most divergent plate boundaries lie in the bottom of the oceans. That is why most volcanic activity occurs in the oceans. Volcanoes may be formed at subduction zones. A subduction zone is a place where two plates, one oceanic plate and one continental plate, collide. At a subduction zone, an oceanic plate submerges under a continental plate. The friction creates magma. When magma reaches the surface, then, a volcano is formed. A typical example of this type of volcano is Mount Etna on the east coast of Italy.

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