Answer the following question given this paragraph: The target cell then needs to be able to recognize the signal. Chemical signals are received by the target cell on receptor proteins. Most receptor proteins are found associated with the plasma membrane, but some are also found inside the cell. Receptor proteins are very specific for only one particular signal molecule, much like a lock that recognizes only one key. Therefore, a cell has lots of receptor proteins to recognize the large number of cell signal molecules. There are three stages to sending and receiving a cell "message:" reception, transduction, and response. Q: Chemical signals are received by the target cell on what? Choices: - acidic proteins - inceptor proteins - parent proteins - receptor proteins A:
receptor proteins
Answer the following question given this paragraph: Summary Superconductors are solids that at low temperatures exhibit zero resistance to the flow of electrical current, a phenomenon known as superconductivity. The temperature at which the electrical resistance of a substance drops to zero is itssuperconducting transition temperature (Tc). Superconductors also expel a magnetic field from their interior, a phenomenon known as the Meissner effect. Superconductivity can be explained by the BCS theory, which says that electrons are able to travel through a solid with no resistance because they couple to form pairs of electrons (Cooper pairs). Hightemperature superconductors haveTc values greater than 30 K. Q: Superconductors expel a magnetic field from their interior. what is this phenomenon known as? Choices: - weissenberg effect - eibner effect - lauer effect - meissner effect A:
meissner effect
Q: Answer the following question given this paragraph: The Fate of the Carbon Skeleton Any amino acid can be converted into an intermediate of the citric acid cycle. Once the amino group is removed, usually by transamination, the -keto acid that remains is catabolized by a pathway unique to that acid and consisting of one or more reactions. For example, phenylalanine undergoes a series of six reactions before it splits into. Q: Which process helps deaminate amino acids? Choices: - deactivation - bromination - caramelization - transamination A:
A: transamination
Question: Answer the following question given this paragraph: If evolution can take a very long time, how can we visualize how it happens? Charles Darwin came up with the idea of an evolutionary tree to represent the relationships between different species and their common ancestors ( Figure below ). The base of the tree represents the ancient ancestors of all life. The separation into large branches shows where these original species evolved into new species. Q: Who created the idea of an evolutionary tree to represent the relationships between different species and their common ancestors? Choices: - Carl Sagan - Scopes - Isaac Newton - charles darwin A:
Answer: charles darwin
*Question*
Answer the following question given this paragraph: The process in which a liquid boils and changes to a gas is called vaporization . The temperature at which a liquid boils is its boiling point. The boiling point of water is 100C (212F). Other types of matter may have higher or lower boiling points. For example, the boiling point of table salt is 1413C. The boiling point of nitrogen is -196C. Q: What is the process in which a liquid boils and changes to a gas? Choices: - sublimation - freezing - melting - vaporization A:
**Answer**
vaporization
*Question*
Answer the following question given this paragraph: 29.3 Photon Energies and the Electromagnetic Spectrum 11. Why are UV, x rays, and rays called ionizing radiation? 12. How can treating food with ionizing radiation help keep it from spoiling? UV is not very penetrating. What else could be used? 13. Some television tubes are CRTs. They use an approximately 30-kV accelerating potential to send electrons to the screen, where the electrons stimulate phosphors to emit the light that forms the pictures we watch. Would you expect x rays also to be created? 14. Tanning salons use "safe" UV with a longer wavelength than some of the UV in sunlight. This "safe" UV has enough photon energy to trigger the tanning mechanism. Is it likely to be able to cause cell damage and induce cancer with prolonged exposure? 15. Your pupils dilate when visible light intensity is reduced. Does wearing sunglasses that lack UV blockers increase or decrease the UV hazard to your eyes? Explain. One could feel heat transfer in the form of infrared radiation from a large nuclear bomb detonated in the atmosphere 75 km from you. However, none of the profusely emitted x rays or rays reaches you. Explain. Can a single microwave photon cause cell damage? Explain. In an x-ray tube, the maximum photon energy is given by. Q: Tanning salons claim to use a "safe" form of what light, with a longer wavelength than that in sunlight? Choices: - infrared - microwave - X rays - uv (ultraviolet) A:
**Answer**
uv (ultraviolet)