Answer: B) B Explanation: The receptor molecules, which receive signals from outside the cell, passing the signal to the inside.   In order for a nerve cell, or any cell, to perceive its environment, it needs a sensory apparatus. And for an individual cell, most of that sensation is derived at the cell surface. So, it expresses on its cell surface proteins that span across the membrane. In the outside world, these proteins can act to receive signals, catching molecules on the outside and then as the molecule passes to the inside of the cell, they can send signals like alarm signals that can tell the cell that a particular molecule is outside.   Hence, here B is the receptor cell.

Answer: D) All the above Explanation: Carbohydrates, together with lipids, proteins and nucleic acids, are one of the four major classes of biologically essential organic molecules found in all living organisms. They not only provide energy for vital metabolic reactions but also supply the building materials for normal structure, growth and repair. Your body needs relatively large quantities of carbohydrates, fats and protein for optimal function, hence their classification as macronutrients.

Answer: A) 6000 BC Explanation: Settled agriculture was first seen in China around 6000 BC. The crops grown at this time were rice and millet.Beginning in about 618 BC with classical millet agriculture, China's development of farming over the course of its history has played a key role in supporting the growth of what is now the largest population in the world.

Answer: A) 80 Explanation: Let marks obtained by N = x M's marks = 0.80x L's marks = 1.25 (0.80x) K's marks = (0.90) (1.25) (0.80x) = 0.9x But 0.9x = 360 ⇒ x = 400 Percentage of Marks obtained by N = 400 x 100/500 = 80%

Answer: B) Persian Explanation:

Answer: B) 15 Explanation: The puzzle's logic is 1st figure : (9-7) + (8-5) = 2 + 3 = 5 2nd figure : (15-6) + (11-2) = 9 + 9 = 18 similarly, 3rd figure : (9-6) + (17-5) = 3 + 12 = 15.

Answer: A) #SecurityCheckKiya Explanation: Google has launched new online security campaign #SecurityCheckKiya in India to promote security awareness among general public. The purpose of the campaign is to protect young and first-time web users from account hijacking, safeguard Android devices from malicious apps and secure all their personal data if they lose their device.

Answer: D) Methane Explanation: Natural gas is primarily composed of methane, but also contains ethane, propane, and heavier hydrocarbons.   Natural gas is a colorless, tasteless, odorless, and non-toxic gas. Because it is odorless, mercaptan is added to the natural gas, in very small amounts to give the gas a distinctive smell of rotten eggs. This strong smell can alert you of a potential gas leak.   It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.