Answer the following question given this paragraph: It could easily be said that a cell is the fundamental unit of life, the smallest unit capable of life or the structural and functional unit necessary for life. But whatever it is, a cell is necessary for life. And as shown above, a cell may be filled with all sorts of structures, each with its own specific function. This concept will discuss some of the fundamental properties of the cell, with lessons that include the cell structure, transport in and out of the cell, energy metabolism, and cell division and reproduction. Q: What is the smallest unit capable of life known as? Choices: - living thing - organism - insect - a cell A:
a cell
(Question)
Answer the following question given this paragraph: Figure 42.10 An antigen is a macromolecule that reacts with components of the immune system. A given antigen may contain several motifs that are recognized by immune cells. Each motif is an epitope. In this figure, the entire structure is an antigen, and the orange, salmon and green components projecting from it represent potential epitopes. Q: An antigen is a macromolecule that reacts with components of what? Choices: - circulatory system - pulmonary system - digestion system - immune system A:
(Answer)
immune system
Ques: Answer the following question given this paragraph: Sometimes ecological succession occurs in areas where life has already existed. These areas already have soil full of nutrients. Secondary succession is the type of succession that happens after something destroys the habitat, such as a flood or other natural disaster. Abandoning a field that was once used for agriculture can also lead to secondary succession ( Figure below ). In this case, the pioneer species would be the grasses that first appear. Lichen would not be necessary as there is already nutrient-rich soil. Slowly, the field would return to its natural state. Q: What is the type of succession that happens after the destruction of a habitat? Choices: - primary succession - typical succession - tertiary succession - secondary succession A:
Ans: secondary succession
(Q).
Answer the following question given this paragraph: The esophagus is a narrow tube that carries food from the throat to the stomach. Food moves through the esophagus because of peristalsis. At the lower end of the esophagus, a circular muscle controls the opening to the stomach. The muscle relaxes to let food pass into the stomach. Then the muscle contracts again to prevent food from passing back into the esophagus. Q: What causes food to move through the esophagus? Choices: - photosynthesis - proteolysis - apoptosis - peristalsis A:
(A).
peristalsis
Ques:Answer the following question given this paragraph: Note that like most other cells, these nerve cells have a nucleus. They also have other organelles. However, the long, threadlike extensions of the nerve cells are unique. This is where the nerve impulses are transmitted. Q: Which part of the nerve cell helps transmit nerve impulses? Choices: - dendrites - cell walls - synapses - long, threadlike extensions A:

Ans:long, threadlike extensions
Answer the following question given this paragraph: Current requires a source of voltage, which is a difference in electric potential energy. Sources of voltage include chemical cells and solar cells. Q: Defined as a difference in electric potential energy, a source of what is required in order to produce an electrical current? Choices: - wattage - momentum - magnetism - voltage A:
voltage