Q: In the mouth, enzymes present in what begin to chemically break down food? Read this paragraph and choose the correct option from the provided answers: The Human Digestive System The process of digestion begins in the mouth with the intake of food (Figure 16.4). The teeth play an important role in masticating (chewing) or physically breaking food into smaller particles. The enzymes present in saliva also begin to chemically break down food. The food is then swallowed and enters the esophagusa long tube that connects the mouth to the stomach. Using peristalsis, or wave-like smooth-muscle contractions, the muscles of the esophagus push the food toward the stomach. The stomach contents are extremely acidic, with a pH between 1.5 and 2.5. This acidity kills microorganisms, breaks down food tissues, and activates digestive enzymes. Further breakdown of food takes place in the small intestine where bile produced by the liver, and enzymes produced by the small intestine and the pancreas, continue the process of digestion. The smaller molecules are absorbed into the blood stream through the epithelial cells lining the walls of the small intestine. The waste material travels on to the large intestine where water is absorbed and the drier waste material is compacted into feces; it is stored until it is excreted through the anus. Choices: - blood - acid - lymph - saliva A:
saliva

(Question)
Q: If an abnormal cell is not prevented from dividing and it divides uncontrollably, what forms? Read this paragraph and choose the correct option from the provided answers: In panel A, an abnormal cell (2) is prevented from dividing, and the abnormal cell dies (1). In panel B, an abnormal cell is not prevented from dividing. Instead, it divides uncontrollably, leading to the formation of a tumor. Choices: - cyst - inflammation - edema - tumor A:
(Answer)
tumor

Ques: Q: What is the name for a specific amount of solute that can dissolve in a given amount of solvent? Read this paragraph and choose the correct option from the provided answers: Solubility is a specific amount of solute that can dissolve in a given amount of solvent. Choices: - humidity - viscosity - concentration - solubility A:
Ans: solubility

(Q).
Q: Humans have about 20,000 to 22,000 genes scattered among 23 of these? Read this paragraph and choose the correct option from the provided answers: The nucleus is a membrane-enclosed organelle found in most eukaryotic cells. The nucleus is the largest organelle in the cell and contains most of the cell's genetic information (mitochondria also contain DNA, called mitochondrial DNA, but it makes up just a small percentage of the cell's overall DNA content). The genetic information, which contains the information for the structure and function of the organism, is found encoded in DNA in the form of genes. A gene is a short segment of DNA that contains information to encode an RNA molecule or a protein strand. DNA in the nucleus is organized in long linear strands that are attached to different proteins. These proteins help the DNA to coil up for better storage in the nucleus. Think how a string gets tightly coiled up if you twist one end while holding the other end. These long strands of coiled-up DNA and proteins are called chromosomes. Each chromosome contains many genes. Humans have about 20,000 to 22,000 genes scattered among 23 chromosomes. Choices: - neutrons - ribosomes - atoms - chromosomes A:
(A).
chromosomes

Ques:Q: What are biochemical compounds that living things use to store energy and make cell membranes? Read this paragraph and choose the correct option from the provided answers: Lipids are biochemical compounds that living things use to store energy and make cell membranes. Types of lipids include fats, oils, and phospholipids. Choices: - carbohydrates - proteins - nucleic acid - lipids A:

Ans:lipids

Q: What happens if a person doesn't take in enough water to replace the water lost in sweat? Read this paragraph and choose the correct option from the provided answers: The boy in Figure below is taking a water break while playing outside on a hot day. If he doesn't take in enough water to replace the water lost in sweat, he may become dehydrated. Symptoms of dehydration include dry mouth, headache, and dizziness. Dehydration can be very serious. It can even cause death. Choices: - diarrhea - fatigue - relaxation - dehydration A:
dehydration