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tatuchka [14]
3 years ago
13

Which bases are found in a strand of DNA?

Biology
2 answers:
lukranit [14]3 years ago
6 0

Answer:

The bases found in a DNA strand are adenine (A), thymine (T), guanine (G) and cytosine (C).

Explanation:

Nitrogen bases are compounds that are part of the composition of DNA and RNA, which are the nucleic acids found in living organ cells.

They are five and can be classified into two types:

  • Purine or purine bases - adenine and guanine
  • Pyrimidine or pyrimidine bases - cytosine, thymine and uracil.

DNA is composed of the following bases:

  • Adenina (A) e guanina (G), que são bases púricas.
  • Citosina (C) e timina (T), que são bases pirimídicas.
Alenkasestr [34]3 years ago
4 0
There are 4 bases:
Adenine,
Thymine, 
Guanine,
Cytosine.
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Winds in our atmosphere are created as a result of which of the following processes?
shusha [124]

Answer:

<em>The correct option is D) Uneven heating of the air in the atmosphere</em>

Explanation:

Wind can simply be described as air which is moving or which is in motion. The uneven heating of the Earth's surface caused by the sun is the reason why winds occur. The difference in pressure of one area to another area causes the air to move and cause wind. The air tends to move from an area of higher pressure to an area of lower pressure and such is the movement of the wind.

4 0
3 years ago
Prokaryotic bacteria are surrounded by a ____________ that contains the ____________ to regulate the entry and exit of materials
lukranit [14]

Prokaryotic bacteria are surrounded by a cell membrane that contains the transport proteins to regulate the entry and exit of materials through the cell, the cell wall to help maintain cell shape and structure, and the capsule, which aids against drying out and protects bacteria from a host's immune system.

<h3><u>Explanation:</u></h3>

Bacteria are the prokaryotic organisms that are found in every part of Earth. These organisms do have an interesting ultrastructure. The coverings of the bacteria are three in layer. They are

A. The outer capsule.

B. The middle cell wall.

C. The inner cell membrane.

The capsule is the outermost covering of bacteria that is formed of different slimy materials. These materials contains hygroscopic substances which can absorb water from the surroundings even when the water concentration in outside is very very low. This layer of protection outside bacteria help them to protect themselves against drying out at dry conditions.

The middle cell wall is formed of polymers of N acetyl glucosamine and N acetyl muramic acid. This layer is chitin in nature and is strong enough to maintain the shape and size of bacteria irrespective of outer conditions.

The innermost layer of bacteria is cell membrane which is formed of proteins and lipids bilayer and this cell membrane contains different transport for proteins which help in transport of different substances like water and nutrients inside the cell by means of active transport or passive diffusion.

6 0
3 years ago
Read 2 more answers
(PLEASE HELP 20 POINTS)
kherson [118]

Answer:

1. b 2.c 3. d 4. c 5. d 6. a 7.a 8.b 9.c 10. a

Explanation:

8 0
2 years ago
It is a winter day in Florida, and the temperature is 40°F in the morning. While you are walking to class, your body uses a nega
zhannawk [14.2K]

Answer:

negative feedback

Explanation:

The negative feedback system is the most common in the body, being considered by many authors the primary mechanism for the maintenance of homeostasis. It causes a negative change from the initial change, that is, a stimulus contrary to the one that led to the imbalance. In the case of the above question, when the ambient temperature increased, your body began to sweat to lower the temperature, that is, your body is trying to make a stimulus contrary to what is happening in the environment, so we can state that your body is going through a negative feedback system.

5 0
3 years ago
Which example shows an organism maintaining homeostasis?
Naddik [55]
The example that shows an organism maintaining homeostasis is b. a person sweating on a hot day. Homeostasis is an organism's ability to maintain a stable internal environment irrespective of the external environment. When a person's body overheats, the body releases water as perspiration or sweat to cool itself down. Another example is when a person gets cold, the hair on his arms and legs, stand up straight - to trap air circulating round his body, and heat it up. 
6 0
3 years ago
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