Q: What are the different feeding positions in a food chain or web called? Read this paragraph and choose the correct option from the provided answers: The different feeding positions in a food chain or web are called trophic levels. Generally, there are no more than four trophic levels because energy and biomass decrease from lower to higher levels. Choices: - neural levels - Primary Level - convoluted levels - trophic levels A:
trophic levels

Q: What replicates in the s phase of interphase, resulting in chromosomes composed of two linked sister chromatids? Read this paragraph and choose the correct option from the provided answers: DNA replicates in the S phase of interphase. After replication, the chromosomes are composed of two linked sister chromatids. When fully compact, the pairs of identically packed chromosomes are bound to each other by cohesin proteins. The connection between the sister chromatids is closest in a region called the centromere. The conjoined sister chromatids, with a diameter of about 1 m, are visible under a light microscope. The centromeric region is highly condensed and thus will appear as a constricted area. Choices: - protein - hormones - RNA - dna A:
dna

Q: Low-level exposure of humans to radiation can cause what? Read this paragraph and choose the correct option from the provided answers: We can see two general types of effects when humans are exposed to radiation. Low-level exposure can lead to development of cancer. The regulatory processes regulating cell growth are disrupted, leading to uncontrolled growth of abnormal cells. Acute exposure can produce nausea, weakness, skin burns, and internal tissue damage. Cancer patients receiving radiation therapy experience these symptoms, but the radiation is targeted to a specific site in the body so that the damage is primarily to the cancer cells and the patient is able to recover from the exposure. Choices: - illness - coughing - bleeding - cancer A:
cancer

Q: One species benefits while the host species is harmed in what type of relationship? Read this paragraph and choose the correct option from the provided answers: In a parasitism, the parasitic species benefits, while the host species is harmed. Choices: - amensalism - fungal - mutualism - parasitism A:
parasitism