Answer the following question given this paragraph: Cooperation between Bacteria and Eukaryotes: Nitrogen Fixation Nitrogen is a very important element to living things, because it is part of nucleotides and amino acids that are the building blocks of nucleic acids and proteins, respectively. Nitrogen is usually the most limiting element in terrestrial ecosystems, with atmospheric nitrogen, N2, providing the largest pool of available nitrogen. However, eukaryotes cannot use atmospheric, gaseous nitrogen to synthesize macromolecules. Fortunately, nitrogen can be "fixed," meaning it is converted into ammonia (NH3) either biologically or abiotically. Abiotic nitrogen fixation occurs as a result of lightning or by industrial processes. Biological nitrogen fixation (BNF) is exclusively carried out by prokaryotes: soil bacteria, cyanobacteria, and Frankia spp. (filamentous bacteria interacting with actinorhizal plants such as alder, bayberry, and sweet fern). After photosynthesis, BNF is the second most important biological process on Earth. The equation representing the process is as follows. Q: Nitrogen is a very important element to living things, because it is part of nucleotides and amino acids that are the building blocks of nucleic acids and these? Choices: - cells - lipids - follicles - proteins A:
proteins
Answer the following question given this paragraph: Epilepsy is a disease that causes seizures. A seizure is a period of lost consciousness that may include violent muscle contractions. It is caused by abnormal electrical activity in the brain. The cause of epilepsy may be an infection, a brain injury, or a tumor. The seizures of epilepsy can often be controlled with medicine. There is no known cure for the disease, but children with epilepsy may outgrow it by adulthood. Q: What type of activity in the brain causes epilepsy? Choices: - hormone imbalance - toxic overload - bleeding - abnormal electrical activity A:
abnormal electrical activity
Q: Answer the following question given this paragraph: This diagram represents the cell cycle in eukaryotes. The cell cycle depicts the life of an eukaryotic cell. The cell cycle has four phases: the first growth or gap (G 1 ) phase, the synthesis (S) phase, the second growth or gap (G 2 ) phase and the mitotic (M) phase. The M phase includes mitosis and cytokinesis. The cell spends the majority of the cycle in the first three phases (G 1 , S, G 2 ) of the cycle, collectively known as interphase. After cytokinesis, two genetically identical daughter cells are formed. Q: How many cycles do cells have? Choices: - six - two - seven - four A:
A: four
Question: Answer the following question given this paragraph: In chemical reactions, atoms are combined, separated, or rearranged. Q: Atoms are combined, separated, or rearranged during what? Choices: - spontaneous mutation - radiation - physical reactions - chemical reactions A:
Answer: chemical reactions
*Question*
Answer the following question given this paragraph: Sound intensity levels are quoted in decibels (dB) much more often than sound intensities in watts per meter squared. Decibels are the unit of choice in the scientific literature as well as in the popular media. The reasons for this choice of units are related to how we perceive sounds. How our ears perceive sound can be more accurately described by the logarithm of the intensity rather than directly to the intensity. The sound intensity level in decibels of a sound having an intensity I in watts per meter squared is defined to be. Q: What is the measure of sound intensity levels? Choices: - octaves - moles - centimeters - decibels A:
**Answer**
decibels
*Question*
Answer the following question given this paragraph: Neurons transmit nerve impulses to other cells. Q: What transmits nerve impulses to other cells? Choices: - fats - muscles - ions - neurons A:
**Answer**
neurons