The discussion has centered on the field of population genetics and developments in DNA science.
These are briefly discussed below. Nucleotides are also known as nitrogenous bases or DNA bases.
Nitrogenous base are of two types, viz. Main features of pyrimidines are given below: Main features or purines are given below: Thus, in DNA there are four different types of nitrogenous bases, viz. In RNA, the pyrimidine base thymine is replace by uracil. The purine and pyrimidine bases always pair in a definite fashion.
Adenine will always pair with thymine and guanine with cytosine. Adenine and thymine are joined by double hydrogen bonds while guanine and cytosine are joined by triple hydrogen bonds. However, these bonds are weak which help in separation of DNA strands during replication.
This is a pentose sugar having five carbon atoms. The four carbon atoms are inside the ring and the fifth one is with CH2 group. This has three OH groups on 1, 3 and 5 carbon positions. Hydrogen atoms are attached to carbon atoms one to four. The phosphate molecule is arranged in an alternate manner to deoxyribose molecule.
Thus there is deoxyribose on both sides of phosphate. The phosphate is joined with carbon atom 3 of deoxyribose at one side and with carbon atom 5 of deoxyribose on the other side. A combination of deoxyribose sugar and nitrogenous base is known as nucleoside and a combination of nucleoside and phosphate is called nucleotide.
Nucleosides differ from nucleotides in that they lack phosphate groups. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. Depending upon the nucleotide base per turn of the helix, pitch of the helix, tilt of the base pair and humidity of the sample, the DNA can be observed in four different forms namely, A, B, C and D.
Main features of B form of DNA are given below: This is the most common form of DNA. The coiling is in the right direction. The number of base is 10 per turn of helix. The pitch is 3. The sugar phosphate linkage is normal.
The helix is narrower and more elongated than A form. The major groove is wide which is easily accessible to proteins.
The minor groove is narrow. The conformation is favored at high water concentrations.AP Biology Essay Questions The following is a comprehensive list of essay questions that have been asked on past AP exams.
The questions are organized according to units. This DNA sequence codes for the following short polypeptide. methionine - leucine - glutamic acid - proline - arginine. Frequently Asked DNA Test Questions. Pre-Test Questions.
Fill out the DNA sample envelope information for each participant. Write each participant’s name, date of birth, race description, and (if applicable) their relationship to the other participants on the sample envelope. Questions and Anwers on DNA and Molecules - Question1 What are Eukaryotes.
Eukaryotes are known to be the organisms which have double membrane or membrane bounded, such as the nucleus, mitochondria than in plant cell this will include chloroplast, examples of this eukaryotes are, animals, plants, fungi and protozoans.
Life's . Biology Final Exam Essay Questions (May ) Contents. 1 How does a DNA molecule code for a protein. Describe the process completely.
2 caninariojana.combe the process of DNA replication; DNA fingerprinting is a process that involves the identifying and evaluating of a person's genetic material (DNA). DNA fingerprinting has a host of different uses. DNA, short for deoxyribonucleic acid, is a group of molecules that hereditary information in which guides development and functioning throughout the body.
“DNA is. Models for Replication of Prokaryotic DNA. Essay # Definition of DNA Replication: DNA replicates by “unzipping” along the two strands, breaking the hydrogen bonds which link the pairs of nucleotides.
Essay on DNA Replication | Genetics. Article Shared by. ADVERTISEMENTS: In this essay we will discuss about: 1. New Questions and.