Ques: Q: What is produced by the sebaceous glands? Read this paragraph and choose the correct option from the provided answers: Structures in the dermis include hair follicles and sebaceous glands, which produce sebum. Choices: - pheromone - sperm - progesterone - sebum A:
Ans: sebum

Ques: Q: Smog is one example of what type of pollution? Read this paragraph and choose the correct option from the provided answers: This picture shows a thick layer of smog and dust over a very polluted city (Singapore). Smog in the air is a serious health hazard for people living in many big cities around the globe. Smog is one example of air pollution. Choices: - light - energy - sound - air A:
Ans: air

Ques: Q: What phenomenon involves the forcing of a substance into a cell against its concentration gradient? Read this paragraph and choose the correct option from the provided answers: During active transport, specialized integral membrane proteins recognize the substance and allows it access. Essentially this process is forcing a ion or molecule to cross the membrane when normally it would not. Moving a substance against its concentration gradient is known as primary active transport , and the proteins involved in it as "pumps". This process uses the energy of ATP. In secondary active transport , energy from an electrochemical gradient is used to transport substances. This process involves pore-forming proteins that form channels through the cell membrane. Choices: - active absorption - osmosis - secondary transport - primary active transport A:
Ans: primary active transport

Ques: Q: What is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone? Read this paragraph and choose the correct option from the provided answers: Figure 3.19 A phospholipid is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone. The phosphate may be modified by the addition of charged or polar chemical groups. Two chemical groups that may modify the phosphate, choline and serine, are shown here. Both choline and serine attach to the phosphate group at the position labeled R via the hydroxyl group indicated in green. Choices: - carbohydrate - polymer - amino acid - phospholipid A:
Ans:
phospholipid