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Maurinko [17]
2 years ago
6

Why do gene mutations occur?

Biology
1 answer:
sveticcg [70]2 years ago
7 0

Answer:

they occur because things caused by environmental factors such as ultraviolet radiation from the sun or can occur if an error is made as DNA copies itself during cell division.

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Three main ingredients that are required for photosynthesis to take place
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To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight.
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3 years ago
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Describe the key features of the Watson-Crick model for DNA structure.
vagabundo [1.1K]

Answer:

Watson and Crick proposed the double helical model of DNA.

Explanation:

- This model says that DNA exist as double helix. It has two polynucelotide strands running in opposite direction i.e the strands are anti-parallel.

- Each polynucleotide strand is made up of several nucleotide liknked together by phophodiester bonds.

- The two strands are not coiled upon each other but the double strand is coiled upon itself around a common axis like the spiral stair case. Here base pairs forms the stairs and backbone of two strands form railing. Back bone contains sugar and phosphate.

- The base pairing is specific, adenine always pairs with thymine and guanine always pairs with cytosine. Thus if we see any base pair, it consists of one purine and one pyrimidine.

- The two strands of DNA thus show complementary base pairing.

- The strands are held together because of hydrogen bonding between the bases in opposite strand.

- One full helical turn involves ten base pairs and the base pairs are stacked  3.4 A apart.

- This form is called as B-form of DNA.

5 0
3 years ago
Water has special characteristics because of the nature of hydrogen bonds what are they?
Amanda [17]

Water has special characteristics because liquid water is denser than ice and ice floats on top of liquid water​.

Answer: Option A & D

<u>Explanation:</u>

A water molecule is formed by the covalent bonding between two atoms of Hydrogen atom with one atom of Oxygen. In water, the Hydrogen bonds are the one that keeps the water molecule intact.  

When the water molecule freezes the bonding becomes weak as they are separated and set apart which makes the liquid water denser than ice. Normally a substance floats if it is less dense. Ice floats because it is less dense than water.  

5 0
3 years ago
______ is the evaporation of water from plants, especially leaves. It is a type of translocation and part of the water cycle. Th
Sophie [7]

Answer:

transpiration

Explanation:

i am sorry if it is right

4 0
2 years ago
Natural selection ________. Question 2 options: A) results in evolutionary adaptation B) is a very rare phenomenon C) does not a
Mnenie [13.5K]

Answer:

A) results in evolutionary adaptation

Explanation:

Natural selection is the process in which organism with specific traits are able to survive than others. Natural selection allows the fittest to survive while eliminating the others. It prepares the species for environmental changes by resulting in evolutionary adaptation.

Evolutionary adaptation occurs when species goes through certain processes (hereditary, habits, Physical structures) to become fit in environment. These changes help the organism to evolve to adopt the changing environmental conditions.

Example; Sweating in human.

7 0
3 years ago
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