Answer the following question given this paragraph: Tropomyosin is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. Tropomyosin binds to troponin to form a troponin-tropomyosin complex. The troponintropomyosin complex prevents the myosin "heads" from binding to the active sites on the actin microfilaments. Troponin also has a binding site for Ca++ ions. To initiate muscle contraction, tropomyosin has to expose the myosin-binding site on an actin filament to allow cross-bridge formation between the actin and myosin microfilaments. The first step in the process of contraction is for Ca++ to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands. This allows the myosin heads to bind to these exposed binding sites and form cross-bridges. The thin filaments are then pulled by the myosin heads to slide past the thick filaments toward the center of the sarcomere. But each head can only pull a very short distance before it has reached its limit and must be "re-cocked" before it can pull again, a step that requires ATP. Q: Tropomyosin is a type of what, that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin? A:

OPTIONS:
- enzyme
- bacteria
- amine
- protein

Answer: protein

Problem: OPTIONS:
- amoena cells
- supercapacitor cells
- mast cells
- phagocytic cells
Q: Answer the following question given this paragraph: Q: Macrophages and dendritic cells are types of what" A:
Answer: phagocytic cells

Problem:OPTIONS:
- hydrogen dichromate
- potassium chloride
- hydrogen chloride
- potassium dichromate

Answer the following question given this paragraph: Oxidation-reduction reactions are of central importance in organic chemistry and biochemistry. The burning of fuels that provides the energy to maintain our civilization and the metabolism of foods that furnish the energy that keeps us alive both involve redox reactions. All combustion reactions are also redox reactions. A typical combustion reaction is the burning of methane, the principal component of natural gas (Figure 5.5 "The Burning of Natural Gas"). CH4 + 2O2 CO2 + 2H2O In respiration, the biochemical process by which the oxygen we inhale in air oxidizes foodstuffs to carbon dioxide and water, redox reactions provide energy to living cells. A typical respiratory reaction is the oxidation of glucose (C6H12O6), the simple sugar we encountered in the chapter-opening essay that makes up the diet of yeast: C6H12O6 + 6O2 6CO2 + 6H2O Organic chemists use a variety of redox reactions. For example, potassium dichromate (K2Cr2O7) is a common oxidizing agent that can be used to oxidize alcohols (symbolized. Q: Which common oxidizing agent can be used to oxidize alcohols? A:
****
A: potassium dichromate

Answer the following question given this paragraph: An atom's protons and electrons carry electrical charges. Protons, with their positive charge, are designated p+. Electrons, which have a negative charge, are designated e. An atom's neutrons have no charge: they are electrically neutral. Just as a magnet sticks to a steel refrigerator because their opposite charges attract, the positively charged protons attract the negatively charged electrons. This mutual attraction gives the atom some structural stability. The attraction by the positively charged nucleus helps keep electrons from straying far. The number of protons and electrons within a neutral atom are equal, thus, the atom's overall charge is balanced. Q: What part of an atom is electrically neutral? A:
OPTIONS:
- protons
- electrons
- newtons
- neutrons
neutrons

Answer the following question given this paragraph: 7. You look through a telescope at Rigel. Rigel is the brightest star in the Orion constellation. Rigel is around 800 light years from Earth. What are you looking at when you look through that telescope? What does Rigel look like today?. Q: What is the brightest star in the orion constellation? A:
OPTIONS:
- natel
- omicron
- sol
- rigel

Answer: rigel

input with options: Answer the following question given this paragraph: The right ventricle pumps oxygen-poor blood toward the lungs, where it receives oxygen. Q: The right ventricle pumps what type of blood toward the lungs? A:
OPTIONS:
- plasma
- oxygenated
- oxygen-rich
- oxygen-poor
output:
oxygen-poor