The chromosomes which determine the sex (maleness or femaleness) of an individual in sexually producing organisms are called sex chromosomes or allosomes or idiosomes. In humans an individual whose cells contain XX chromosomes (homo or isogametic) becomes a female, while one whose cells contains XY chromosomes (heterogametic) becomes a male.

Correct Option: D

The chromosomes which determine the sex (maleness or femaleness) of an individual in sexually producing organisms are called sex chromosomes or allosomes or idiosomes. In humans an individual whose cells contain XX chromosomes (homo or isogametic) becomes a female, while one whose cells contains XY chromosomes (heterogametic) becomes a male.

Hemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells. It is responsible for binding oxygen in the lung and transporting the oxygen throughout the body to be used up in aerobic metabolic pathways. The oxygen binding properties of hemoglobin exist because of the interaction between oxygen and the iron atom of the heme groups and hemoglobin's quaternary structure.

Correct Option: A

Hemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells. It is responsible for binding oxygen in the lung and transporting the oxygen throughout the body to be used up in aerobic metabolic pathways. The oxygen binding properties of hemoglobin exist because of the interaction between oxygen and the iron atom of the heme groups and hemoglobin's quaternary structure.

Keratin is a fibrous protein making up most cells found in our nails and hair and the epidermis layer of our skin. It also makes up fish scales and crustacean shells, bird feathers and beaks, and animal horns and hooves.

Correct Option: C

Keratin is a fibrous protein making up most cells found in our nails and hair and the epidermis layer of our skin. It also makes up fish scales and crustacean shells, bird feathers and beaks, and animal horns and hooves.

Drones are male honey bees. They develop from eggs that have not been fertilized, and they cannot sting, since the worker bee's stinger is a modified ovipositor (an egg laying organ).

Correct Option: B

Drones are male honey bees. They develop from eggs that have not been fertilized, and they cannot sting, since the worker bee's stinger is a modified ovipositor (an egg laying organ).

Some of the benefits of Mushroom cultivation are:
(a) it has been found to coincide with decrease of incidents of breast cancer;
(b) Spent residues such as those obtained after cultivation of edible mushrooms could be a better source of bio- logically pretreated substrates for biogas production; and
(c) Mushrooms can be grown on virtually all types of available wastes; and
(d) agricultural waste recycling can be achieved through controlled cultivation of mushrooms.

Correct Option: B

Some of the benefits of Mushroom cultivation are:
(a) it has been found to coincide with decrease of incidents of breast cancer;
(b) Spent residues such as those obtained after cultivation of edible mushrooms could be a better source of bio- logically pretreated substrates for biogas production; and
(c) Mushrooms can be grown on virtually all types of available wastes; and
(d) agricultural waste recycling can be achieved through controlled cultivation of mushrooms.