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Questions in biology
📝 Answered - Non-digestible carbohydrates are most commonly referred to as which of the following? A) Glycogen B) Amylase C) Maltose D) Dietary fiber
📝 Answered - The doubling period of a bacterial population is 20 minutes. At time [tex]$t=120$[/tex] minutes, the bacterial population was 90000. What was the initial population at time [tex]$t=0$[/tex]? Find the size of the bacterial population after 4 hours.
📝 Answered - Which of the following best describes what happens after a lysosome is made in the rough endoplasmic reticulum of a plant cell? A. It becomes embedded in the cell membrane and allows ions to enter the cell. B. It is sent to the Golgi apparatus for further processing. C. It enters the chloroplast and absorbs light during photosynthesis. D. It begins releasing enzymes to break down large molecules.
📝 Answered - Darwin hypothesized that new species could appear gradually through small changes in an ancestral species. What experiment did he conduct to test this hypothesis? A. the breeding of finches B. the breeding of pigeons C. the observation of humans D. the observation of dog breeds
📝 Answered - Modern research indicates environmental factors can influence genetic development. A. True B. False
📝 Answered - Describe the negative feedback mechanism in the interaction of the pituitary gland and thyroid gland.
📝 Answered - A chemical substance that helps relay nerve impulses in the brain is called a(n) _______.
📝 Answered - What occurs during cytokinesis? A. The cells grow, store up energy, and take in nutrients, so mitosis can begin. B. The new chromosomes align at the center of the cell then separate, so the DNA can shift toward the ends of the cell. C. The original nuclei, cytoplasm, organelles, and cell membrane are divided into two "daughter" cells. D. The enzymes in the cell are manufactured, the DNA is replicated, and a parent cell is created.
📝 Answered - Osmosis can be defined as: A. the diffusion of a solute across a selectively permeable membrane B. the diffusion of water across a selectively permeable membrane C. the diffusion of any small molecule across a selectively permeable membrane D. active transport across a selectively permeable membrane
📝 Answered - In operant conditioning, positive reinforcement: A. Increases behavior by adding a pleasant stimulus B. Reduces behavior C. Punishes unwanted behavior D. Removes positive consequences
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