Biology MCQs

Notes:
In Vermicomposting, the Bed Method in which beds of organic matter are prepared.

Notes:
Bioethanol is denatured alcohol that is also called Methylated spirit. It is a liquid made from alcohol and other chemicals.

Notes:
Klenow fragment is derived from DNA Pol-I. A Klenow fragment is a large protein fragment. It is enzymatically cleaved by the protease subtilisin to DNA polymerase from E. coli.

Notes:
The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.

Notes:
Among the many things parents hand down to their children are 23 pairs of chromosomes-those thread-like structures in the nucleus of every cell containing the genetic instructions for every person. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair. Females always pass an X chromosome onto their offspring. If the father passes on an X chromosome, the baby will be genetically female, and if the father passes on a Y chromosome, the baby will be genetically male.

Notes:
Red blood cells, also called erythrocytes, are the most abundant cell type in the blood. The primary function of red blood cells is to transport oxygen to body cells and deliver carbon dioxide to the lungs. Red blood cells are derived from stem cells in red bone marrow. These cells have a life-span of about 120 days.

Notes:
Blood clotting occurs at the point of injury to control bleeding from blood vessels. The coagulation of the blood is initiated by the blood platelets. They normally start the clotting process when they’re exposed to the air, such as in a cut or wound. Calcium ions are required for the promotion or acceleration of blood clotting pathways. With the help of vitamin K and calcium, fibrinogen (a protein that reacts with platelets) forms a mesh of tiny threads that collects red blood cells, which plug the open blood vessels as it dries. This is a clot.

Notes:
Calciferol (Vitamin D); Tocopherols and tocotrienols (Vitamin E); Phylloquinone, menaquinones (Vitamin K); and Retinol, retinal, and four carotenoids including beta carotene (Vitamin A) are all fat soluble vitamins. Out of total of 64 codons are nonsense codon. They do not code for any amina acid.

Notes:
Crabs come from the same family as lobsters, crayfish, shrimp, krill and barnacles, as all are in the subphylum crustacea. They are also in the phylum Arthropoda, which includes insects, arachnids and crustaceans. They are decapods (having ten legs) and form an order within the decapods, called the Brachyura.

Notes:
Proper storage of seed is vital to conserving its vigour and vitality. Seeds can last from a few years to centuries, depending on the species and the storage conditions. In general, most seeds stored in cool, dry conditions will survive longer than seeds stored in a wet, warm environment.