Answer:
Chromosomes are arranged in pairs because one of each set of the two comes from each parent .We receive half our DNA from our mother (in the ovum) and the other half from our father (in the sperm). A normal human being will therefore have 46 chromosomes or 23 pairs. This is mainly done to achieve genetic variation.
Explanation:
Answer:
Ribosomes
Answer: The arrow labelled X is ribosome. Explanation: Ribosomes can be described as structures which are the protein manufacturing unit.
Answer:
Meristematic tissue.
Explanation:
Meristematic tissue contains stem cells which can differentiate into permanent cells. This tissue is at all continuous growth points in a plant, at the apical buds ( where leaves and flowers form) and at the ends of roots.
- dermal tissue is in animals - this refers to the tissues associated with skin
- vascular tissue refers to the xylem and phloem of a plant- no growth occurs here.
- Permanent tissue is tissue which has already differentiated and grown. This is the final form.
Answer:
The further you move down a classification pyramid, the fewer species there will be at each level >:3
Explanation:
:3
Explanation:
protein is the element responsible for building up of cells and the nucleic acid is embedded in the cell, so protein builds the whole cell including the nucleic acids.. the nucleic acid is also packed by histones which is a proteinous structure. both are important because, in the cell all organelles require protein for their growth and likewise the encoding of the genetic information carrier
