Q: What type of protein speeds up chemical reactions in cells? Read this paragraph and choose the correct option from the provided answers: Proteins are an essential part of all organisms. They play many roles in living things. Certain proteins provide a scaffolding that maintains the shape of cells (structural proteins). Proteins also make up the majority of muscle tissues. Many proteins are enzymes that speed up chemical reactions in cells. Enzymes interact with the substrates (reactants) of a biochemical reaction, helping the reaction proceed at a much faster rate. Other proteins are antibodies that protect you from pathogens. Antibodies bond to foreign substances in the body and target them for destruction. Still other proteins help carry messages or materials in and out of cells (transport proteins) or around the body. For example, the blood protein hemoglobin (see Figure below ) bonds with oxygen and carries it from the lungs to cells throughout the body. Choices: - hemoglobin - lipids - collagen - enzyme A:
enzyme
------
Q: What is the term for individuals of a species that live in a particular habitat? Read this paragraph and choose the correct option from the provided answers: CHAPTER SUMMARY 45.1 Population Demography Populations are individuals of a species that live in a particular habitat. Ecologists measure characteristics of populations: size, density, dispersion pattern, age structure, and sex ratio. Life tables are useful to calculate life expectancies of individual population members. Survivorship curves show the number of individuals surviving at each age interval plotted versus time. Choices: - family - ecosystem - biosphere - population A:
population
------
Q: In physics, the number of waves that pass a fixed point in a given amount time is referred to as what ? Read this paragraph and choose the correct option from the provided answers: Wave speed is related to both wavelength and wave frequency. Wavelength is the distance between two corresponding points on adjacent waves. Wave frequency is the number of waves that pass a fixed point in a given amount of time. This equation shows how the three factors are related:. Choices: - combination frequency - wave count - creation frequency - wave frequency A:
wave frequency
------
Q: What is the name of the region of a magnet that has the most pull? Read this paragraph and choose the correct option from the provided answers: Imagine a huge bar magnet passing through Earth's axis, as in the Figure below . This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts the most force. Choices: - center - grid - tail - pole A:
pole
------