Complete each statement.
- guanine (G), cytosine (C) and thymine (T) are the four
in DNA,
- In DNA
always forms hydrogen bonds with guanine (G). - The sequence of_
carries the genetic information of an organism. - The process of
produces a new copy of an organism’s genetic
information which is passed on to a new cell. - The double-coiled shape of DNA is called a
The Correct Answer and Explanation is:
Here are the completed statements along with a detailed explanation of each.
- Guanine (G), cytosine (C), adenine (A), and thymine (T) are the four nucleotides in DNA.
- In DNA, cytosine (C) always forms hydrogen bonds with guanine (G).
- The sequence of nucleotides carries the genetic information of an organism.
- The process of DNA replication produces a new copy of an organism’s genetic information, which is passed on to a new cell.
- The double-coiled shape of DNA is called a double helix.
Explanation
1. Nucleotides in DNA:
DNA is composed of four types of nucleotides: adenine (A), thymine (T), cytosine (C), and guanine (G). Each nucleotide consists of a phosphate group, a sugar (deoxyribose), and a nitrogenous base (A, T, C, or G). The specific arrangement of these nucleotides encodes the genetic instructions necessary for the growth, development, and functioning of living organisms.
2. Base Pairing:
In DNA, cytosine (C) pairs with guanine (G) through three hydrogen bonds, while adenine (A) pairs with thymine (T) through two hydrogen bonds. This specific base pairing is crucial for maintaining the structure of the DNA double helix and ensuring the accuracy of genetic information during replication and transcription processes.
3. Genetic Information:
The sequence of nucleotides in DNA determines the genetic information carried by an organism. This sequence encodes genes, which are segments of DNA that instruct cells on how to synthesize proteins. The expression of these proteins influences an organism’s traits and functions, making the nucleotide sequence fundamental to heredity and biological diversity.
4. DNA Replication:
DNA replication is the process by which a cell makes an exact copy of its DNA. This is essential during cell division, ensuring that each new cell receives a complete set of genetic instructions. Enzymes like DNA polymerase play a critical role in this process, synthesizing new strands by adding complementary nucleotides to each original strand.
5. Double Helix Structure:
The structure of DNA is often described as a double helix, which resembles a twisted ladder. This shape is stabilized by hydrogen bonds between base pairs and the sugar-phosphate backbone. The double helix allows for the compact storage of genetic information while also providing the necessary accessibility for replication and transcription.
Overall, the combination of nucleotide composition, specific base pairing, and the double helical structure is fundamental to the function and integrity of genetic material in all living organisms.