VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in biology

[Terjawab] 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

[Terjawab] Modern research indicates environmental factors can influence genetic development. A. True B. False

[Terjawab] Describe the negative feedback mechanism in the interaction of the pituitary gland and thyroid gland.

[Terjawab] A chemical substance that helps relay nerve impulses in the brain is called a(n) _______.

[Terjawab] 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.

[Terjawab] 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

[Terjawab] In operant conditioning, positive reinforcement: A. Increases behavior by adding a pleasant stimulus B. Reduces behavior C. Punishes unwanted behavior D. Removes positive consequences

[Terjawab] In which type of selection does a change in the environment make it so that individuals with one type of extreme trait survive and reproduce at higher rates than other individuals? A. directional selection B. stabilizing selection C. disruptive or diversifying selection D. frequency-dependent selection

[Terjawab] Antibiotic-resistant strains of bacteria tend to first be found in hospitals. Which factor explains why this is the case? A. A hospital has more bacteria than would be found in other places. B. Sick people are more likely to provide an environment where resistant strains are favored. C. Antibiotics are more likely to be present in hospitals, thus selecting for resistant strains. D. Bacteria can reproduce more easily in a hospital environment than in other places. E. Bacteria cannot survive as successfully in areas outside of hospitals.

[Terjawab] Which environmental factor would likely lead to an increase in genetic variation in a population of squirrels? A. an increase in predators B. an increase in available food C. an increase in forest fires D. an increase in pollution