The first class lever is the most common lever in the human body. True/False
Answer:
False
Explanation:
In first-class levers, the position of the fulcrum is between the effort and the load. In these levers such as scissors, if the effort (child) is farther from the fulcrum than the load, a heavy load can be moved. There are few first-class levers in the human body.
One of the examples of such a lever is the head resting on the vertebral column. When the head is raised, the contraction of the posterior neck muscles provides the effort and the fulcrum is formed by the joint between the atlas and the occipital bone. Third class levers are the most common types present in the human body.
Answer:
C
Explanation:
A DNA is made up of proteins which was synthesized by ribosomes of the cell to produce mRNA and then these mRNA and used to catalyse the DNA production. DNA of a cell in the nucleus is the programmed individuality that controls, manages and organizes the entire cell to function and initiate celluar activities.
Homologous pairs, Eg. X and Y
One pair in paternal and the other in maternal, obtained during Meiosis.
Answer: the absorption of water by the roots
Explanation:
Evaporation of water through the leaves is known as transpiration, and it occurs readily only when environmental conditions such as humidity is high.
On the other hand, the absorption of water by root hairs which is then conducted by the xylem vessels up the stem to various parts of the plant is a important process that determines how water move through a plant to ensure cellular processes such as photosynthesis, respiration etc takes place.
Thus, the absorption of water by the roots plays a much more important role in the movement of water in a plant
Answer:
ribosomes
Explanation:
Ribosomes are cell organelles found within all living cells. They serve as the site of biological protein synthesis i.e. where proteins are made in cell.