Answer the following question given this paragraph: (left) The DNA double helix wraps around proteins (2) and tightly coils a number of times to form a chromosome (5). This figure shows the complexity of the coiling process. The red dot shows the location of the centromere, where the microtubules attach during mitosis and meiosis. (right) A representation of a condensed eukaryotic chromosome, as seen after the DNA has been copied. The chromosome is made of two identical, or sister, chromatids held together by a centromere. Q: What genetic unit is formed when the dna double helix wraps around proteins and tightly coils a number of times? Choices: - atom - gene - neutron - chromosome A:
chromosome
Answer the following question given this paragraph: Q: Photoreceptors in each ocellus receive light only through the opening where there are none of which cells? Choices: - clear - opqaue - secreted - pigmented A:
pigmented
Q: Answer the following question given this paragraph: All of these animal behaviors are important. They help the animals get food for energy, make sure their young survive, or ensure that they, themselves, survive. Behaviors that help animals or their young survive, increase the animals' fitness. Animals with higher fitness have a better chance of passing their genes on to the next generation. If genes control behaviors that increase fitness, the behaviors become more common in the species. This occurs through the process of evolution by natural selection. Q: Fitness and natural selection are parts of what theory that might describe how organisms change over time? Choices: - dessication - gravity - implementation - evolution A:
A: evolution
Question: Answer the following question given this paragraph: There is some variation in the inherited traits of organisms within a species. Without this variation, natural selection would not be possible. Q: What process would be impossible without some variation in the inherited traits of organisms within a species? Choices: - environmental selection - darwin's selection - characteristic selection - natural selection A:
Answer: natural selection
*Question*
Answer the following question given this paragraph: Food Chains and Food Webs A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another; the levels in the food chain are producers, primary consumers, higher-level consumers, and finally decomposers. These levels are used to describe ecosystem structure and dynamics. There is a single path through a food chain. Each organism in a food chain occupies a specific trophic level (energy level), its position in the food chain or food web. In many ecosystems, the base, or foundation, of the food chain consists of photosynthetic organisms (plants or phytoplankton), which are called producers. The organisms that consume the producers are herbivores: the primary consumers. Secondary consumers are usually carnivores that eat the primary consumers. Tertiary consumers are carnivores that eat other carnivores. Higher-level consumers feed on the next lower trophic levels, and so on, up to the organisms at the top of the food chain: the apex consumers. In the Lake Ontario food chain, shown in Figure 20.4, the Chinook salmon is the apex consumer at the top of this food chain. Q: Producers, primary consumers, higher-level consumers, and decomposers are levels in what? Choices: - food model - energy chain - food flowchart - food chain A:
**Answer**
food chain
(Question)
Answer the following question given this paragraph: Q: Nucleic acids are polymers made of monomers called what? Choices: - loops - carotenoids - peptides - nucleotides A:
(Answer)
nucleotides