Answer :FACILITATED DIFFUSIION
Explanation;Generally polar molecules like glucose, amino acids and Ions such as potassium and sodium can not enter or leave the cell through the phospholipid bilayer membrane of the cell. They are assisted to pass accross this barrier with the help of (1) channel proteins 2) carrier proteins.
The process by which these proteins created hydrophilic (water loving environments) to carry out transport of the above molecules and ions accross the hydrophobic (water hating environment) phospholipid membrane layer to reach the cytoplasm of cells is called facilitated diffusion.
This transport process is not active transport, because the moleucules moved down their concentration gradients.
Water- filled pores made up Channel proteins. They allows charged ions to pass through, therefore Ion channels are example of channel proteins; for example Potassium channels, Calcium channels. They are gated, thus the protein parts can move back and front like a gate to close or open the pores like a <u>Gate. Channels proteins are fixed.</u>
Carrier proteins are flexible and change the shapes with respect to the direction to convey the molecules accross the membrane, they are not fixed.
Answer:
c. They have high biodiversity
Explanation:
Answer:
- If it were true, all organisms would be complex and simple organisms would disappear
- It does not account for genetic mutations known to affect physical traits
Explanation:
Lamark's theory of evolution is that changes in the organism's physical form during its lifetime can be passed on to its offspring. In other words, he believed that children can inherit acquired characteristics from their parents.
The classic example is that he believed giraffes evolved long necks because they would stretch upwords to eat leaves from tall trees, elongating their necks, and then would pass on a longer neck to its children. Or in humans, that a body builder would make a muscular child because of their intense training!
There are a few problems with this theory:
- If we believe this theory, organisms would always be getting more and more complex and 'improved', so simple organisms would disappear.
- We know that changes to the DNA influence inherited physical characteristics, not simply continued use
Answer:
head of the humerus, Acromial end of the clavicle
Explanation:
The shoulder is made up of three bones: the scapula, the clavicle and the humerus (upper arm bone). Two joints in the shoulder allow it to move: the acromioclavicular joint, where the highest point of the scapula (acromion) meets the clavicle at its acromial end (the sternal end of the clavicle is bounded to the sternon), and the glenohumeral joint. The scapula also bounds to the head of the humerus, it is, the distal superior end.
