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Questions in biology

[Terjawab] A DNA molecule can be described as a twisted ladder. The ________ form the sides, and the ________ form the rungs. Select one: A. sugar-phosphate chains; base pairs B. base pairs; sugar-phosphate chains C. sugars; phosphates D. sugars; base pairs

[Terjawab] Organic macromolecules called _______ are insoluble in water, are often found in biological membranes and other waterproof coverings, and have the ability to store energy for extended periods of time. A. proteins B. lipids C. nucleic acids D. carbohydrates

[Terjawab] The walking catfish, or Clarias batrachus, is an invasive species that can migrate over land. Which of the following describes the most likely long-term consequence of the introduction of the walking catfish? A. The walking catfish will become unable to survive in its native territory as it continues to migrate. B. Dissolved oxygen levels will increase as more fish are able to breathe and survive above water. C. Native fish populations will decline and possibly become extinct as they compete for food and space. D. Larger fish will overpopulate due to the presence of an additional food source.

[Terjawab] In pea plants, the allele for tall plants is dominant to the allele for short plants. If a homozygous tall plant is crossed with a homozygous short plant, what percent of offspring would you expect to be short? A. 0 percent B. 25 percent C. 50 percent D. 100 percent

[Terjawab] Fossils in Precambrian rocks are rare, while there are many fossils in rocks from the Phanerozoic eon. What does this evidence suggest? A. There was a major change in the diversity of life in the Phanerozoic eon, probably due to mass extinction. B. There was no life in the Precambrian eon. C. The rocks from the Phanerozoic eon are much harder than those from the Precambrian eon. D. There was no change in the diversity of life in the Phanerozoic eon.

[Terjawab] Which of the following statements about the two strands of a DNA molecule is true? Select one: A. The strands are a pair of sister chromatids. B. The strands are connected to each other by sugar-phosphate bonds. C. A T base on one strand always pairs with an A base on the other strand. D. An A base on one strand always pairs with a G base on the other strand. E. The strands have identical base sequences.

[Terjawab] 1. What element has 81 protons in the nuclei of its atoms? A. Platinum B. Lead C. Thallium D. Uranium

[Terjawab] Both photosynthesis and aerobic cellular respiration produce ATP using an electron transport chain. Therefore, both chloroplasts and mitochondria contain: Select one: A. membranous structures B. the electron carrier NADPH C. the electron carrier NADH D. none of the above

[Terjawab] Provide a sentence using the term "fluid mosaic model."

[Terjawab] A pollen tube is essential to the process of pollination because _________________________. Select one: A. it creates pollen B. it allows the male nucleus to reach the female gamete C. bees would not be able to reach pollen without it D. it provides nutrients to a seed