Answer:
Phosphate sugar backbone:
The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.
Nitrogenous base:
Nitrogen bases are the molecules that make up the steps of the ladders. There are four different nitrogen bases, namely; Guanine, Thymine,Adenine and Cytosine.
Pyrimidines are compounds that make a single 6-sided ring. Examples of pyrimidines are Cytosine and Thymine.
Purines on the other hand make 5-sided and 6-sided rings. Examples of purines are Guanine and Adenine.
The nitrogen bases are helped together through hydrogen bonds.
Hydrogen Bonds:
A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
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Explanation:
The difference between Meristematic Tissue and Permanent Tissue are:
- Meristematic tissue always has a prominent nucleus. Permanent tissue has a prominent nucleus in some like parenchyma while not in others like sclerenchyma.
- Meristematic tissue has cells small in size and isodiametric in shape. Permanent tissue has cells large in size and their shape varies.
Striated Muscles. Cardiac muscles are in your heart, cartilage is flexible connective tissue found in various forms in the larynx and respiratory tract. Organs are things like your heart, stomach, liver, etc.
Answer:
Columnar epithelial tissue.
Explanation:
The above scenario confirms that these are simple columnar epithelial tissue because columnar cells are tall, narrow and nucleus in the tall column like cells located at the basal end of the cells. Columnar epithelial tissue are responsible for absorption and secretion of molecules. These are present at some part of digestive tract, female reproductive tract, and respiratory system.
