A dichotomous key helps you identify unknown specimens based on their traits because there are only two options available per trait. Selecting one from the two options (usually contrasting characteristics) from each step leads to smaller and smaller groups until the option is reduced to single and unique trait of an organism.
Considering you need to identify an organism. So, on the top of they key is animal with options: (a) with red blood cells and (b) no red blood cells. The option you will select is no red blood cells and under option b, you’re given two choices again: (a) hard bodies and (b) soft bodies. You’ll select soft bodies, then two options again are given: (a) with shell and (b) without shell. The option you’ll select would be without shell, and so on.
The central nervous system of the frog is different from that of humans; if the optic nerve of a frog is cut, the animal will be able to see again within weeks but the same damage in humans would cause permanent blindness :).
They both have a bilipid cell membrane. This means that their cell membrane is composed of phospholipids. Both cells also have ribosomes. This is a critical cell organelle that is involved in the translation of mRNA to proteins. Their genetic material is also made up of deoxyribose sugars (DNA).
Answer:
22.solution A is hypertonic
23.hypotonic
24.hypertonic
25.hypotonic
26.isotonic
Answer:
(a) Z-lines
(b) Sarcomeres
(c) The arrangement of of actin and myosin filament is called the 'double strand of pearls'
(d) The alternating strands of actin and myosin filaments gives a skeletal muscle fibre its striated appearance.
Explanation:
Each skeletal muscle is a discrete organ, made up of several kinds of tissues.These tissue includes: skeletal muscle fibres, blood vessels, nerve fibres and connective tissues. Each muscle fibre contains many myofibrils that run parallel to its length.
A sarcomere is the region of a myofibril between two successive Z- disk (or Z-lines), which is basically a 'junction points' between sarcomeres.
The striated appearance of skeletal muscle fibers is due to the arrangement of the thick and thin myofilaments within each sarcomere. And within these actin and myosin filaments are found.
