Q: Something that has all of the characteristics of life is considered to be what? Read this paragraph and choose the correct option from the provided answers: There is not just one distinguishing feature that separates a living thing from a non-living thing. A cat moves but so does a car. A tree grows bigger, but so does a cloud. A cell has structure, but so does a crystal. Biologists define life by listing characteristics that living things share. Something that has all of the characteristics of life is considered to be alive. The duck decoy in Figure below may look like a duck, act like a duck in that it floats about, but it is not alive. The decoy cannot reproduce, respond to its environment, or breathe. Choices: - molecule - organism - ecosystem - alive A:
alive

Q: The production of light by living things is called what? Read this paragraph and choose the correct option from the provided answers: Another interesting feature of many cnidarians is the ability to produce light. The production of light by living things is called bioluminescence. A more familiar example of bioluminescence is the light produced by fireflies. In cnidarians, bioluminescence may be used to startle predators or to attract prey or mates. Watch this short video to see an amazing light show put on by a jellyfish at the Monterey Aquarium in Monterey, California: https://www. youtube. com/watch?v=kdufLq2P1Ag . Choices: - apoptosis - attenuation - bio-glow - bioluminescence A:
bioluminescence

Q: Q: How many chambers are in the heart? Read this paragraph and choose the correct option from the provided answers: The atria receive the blood, and the ventricles pump the blood out of the heart. Each of the four chambers of the heart has a specific job. Choices: - two - eight - five - four A:
A: four

Question: Q: During what in the small intestine do rings of smooth muscle repeatedly contract and then relax? Read this paragraph and choose the correct option from the provided answers: Mechanical Digestion in the Small Intestine The movement of intestinal smooth muscles includes both segmentation and a form of peristalsis called migrating motility complexes. The kind of peristaltic mixing waves seen in the stomach are not observed here. If you could see into the small intestine when it was going through segmentation, it would look as if the contents were being shoved incrementally back and forth, as the rings of smooth muscle repeatedly contract and then relax. Segmentation in the small intestine does not force chyme through the tract. Instead, it combines the chyme with digestive juices and pushes food particles against the mucosa to be absorbed. The duodenum is where the most rapid segmentation occurs, at a rate of about 12 times per minute. In the ileum, segmentations are only about eight times per minute (Figure 23.20). Choices: - mitosis - contraction - compression - segmentation A:
Answer: segmentation

*Question*
Q: The energy changes in what reactions are enormous compared with those of even the most energetic chemical reactions, and they result in a measurable change of mass? Read this paragraph and choose the correct option from the provided answers: To understand the differences between nuclear fission and fusion. Nuclear reactions, like chemical reactions, are accompanied by changes in energy. The energy changes in nuclear reactions, however, are enormous compared with those of even the most energetic chemical reactions. In fact, the energy changes in a typical nuclear reaction are so large that they result in a measurable change of mass. In this section, we describe the relationship between mass and energy in nuclear reactions and show how the seemingly small changes in mass that accompany nuclear reactions result in the release of enormous amounts of energy. Choices: - molecular reaction - metabolic reaction - methane combustion - nuclear reactions A:
**Answer**
nuclear reactions

Q: Which factor often changes a protein from an inactive form to an active form? Read this paragraph and choose the correct option from the provided answers: Choices: - oxygen groups addition - lipid groups addition - nitrogen groups addition - phosphate groups addition A:
phosphate groups addition