Answer the following question given this paragraph: The amount of material left over after a certain number of half-lives can be easily calculated. Q: What term is used to describe a chemical released by an animal that affects the behavior or physiology of animals of the same species? Choices: - enzyme - isolate - amino - pheromone A:
pheromone
(Question)
Answer the following question given this paragraph: Photoautotrophs are cells that capture light energy, and use carbon dioxide as their carbon source. There are many photoautotrophic prokaryotes, which include cyanobacteria. Photoautotrophic prokaryotes use similar compounds to those of plants to trap light energy. Q: What type of cells capture light energy, and use carbon dioxide as their carbon source? Choices: - sporozoans - blood cells - chloroplasts - photoautotrophs A:
(Answer)
photoautotrophs
Ques: Answer the following question given this paragraph: Sensory-Somatic Nervous System The sensory-somatic nervous system is made up of cranial and spinal nerves and contains both sensory and motor neurons. Sensory neurons transmit sensory information from the skin, skeletal muscle, and sensory organs to the CNS. Motor neurons transmit messages about desired movement from the CNS to the muscles to make them contract. Without its sensorysomatic nervous system, an animal would be unable to process any information about its environment (what it sees, feels, hears, and so on) and could not control motor movements. Unlike the autonomic nervous system, which has two synapses between the CNS and the target organ, sensory and motor neurons have only one synapseone ending of the neuron is at the organ and the other directly contacts a CNS neuron. Acetylcholine is the main neurotransmitter released at these synapses. Humans have 12 cranial nerves, nerves that emerge from or enter the skull (cranium), as opposed to the spinal nerves, which emerge from the vertebral column. Each cranial nerve is accorded a name, which are detailed in Figure 35.28. Some cranial nerves transmit only sensory information. For example, the olfactory nerve transmits information about smells from the nose to the brainstem. Other cranial nerves transmit almost solely motor information. For example, the oculomotor nerve controls the opening and closing of the eyelid and some eye movements. Other cranial nerves contain a mix of sensory and motor fibers. For example, the glossopharyngeal nerve has a role in both taste (sensory) and swallowing (motor). Q: Motor neurons and sensory neurons are part of what nervous system? Choices: - peripheral - central - autonomic - sensory-somatic A:
Ans: sensory-somatic
(Q).
Answer the following question given this paragraph: Compounds are unique substances that form when two or more elements combine chemically. The smallest particles of compounds are molecules. Some compounds form crystals instead. Q: What do you call a unique substance formed when two or more elements combine chemically? Choices: - component - mixture - solution - compound A:
(A).
compound
Ques:Answer the following question given this paragraph: Earth itself acts like a gigantic gyroscope. Its angular momentum is along its axis and points at Polaris, the North Star. But Earth is slowly precessing (once in about 26,000 years) due to the torque of the Sun and the Moon on its nonspherical shape. Q: Earth acts like a giant version of what device, with angular momentum along its axis and pointing at polaris, the north star? Choices: - compass - telescope - accelerator - gyroscope A:

Ans:gyroscope
Question: Answer the following question given this paragraph: Nuclear Fission Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleonthat is, mass numbers and binding energies per nucleon that are closer to the "peak" of the binding energy graph near 56 (see Figure 21.3). Sometimes neutrons are also produced. This decomposition is called fission, the breaking of a large nucleus into smaller pieces. The breaking is rather random with the formation of a large number of different products. Fission usually does not occur naturally, but is induced by bombardment with neutrons. The first reported nuclear fission occurred in 1939 when three German scientists, Lise Meitner, Otto Hahn, and Fritz Strassman, bombarded uranium-235 atoms with slow-moving neutrons that split the U-238 nuclei into smaller fragments that consisted of several neutrons and elements near the middle of the periodic table. Since then, fission has been observed in many other isotopes, including most actinide isotopes that have an odd number of neutrons. A typical nuclear fission reaction is shown in Figure 21.14. Q: The first reported nuclear fission occurred in 1939 when three german scientists bombarded uranium-235 atoms with slow-moving what? Choices: - protons - electrons - isotopes - neutrons A:
Answer:
neutrons