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Questions in biology

📝 Answered - Once water with dissolved minerals gets into the xylem, how does it move up the plant? A. Capillary action B. Suction C. Mass flow D. Osmosis

📝 Answered - The process in which bacterial DNA is transferred from a donor cell to a recipient cell inside a bacteriophage is called A) Conjugation B) Transduction C) Transformation D) Transcription

📝 Answered - The purpose of the Ames test is to: A) detect mutant bacteria B) assay histidine usage by bacteria C) detect mutagenic chemicals D) test the safety of rat liver extracts as a food additive

📝 Answered - Over time, the number of organisms in a population increases exponentially. The table below shows the approximate number of organisms after y years. | y years | number of organisms, n | | ------- | ---------------------- | | 1 | 55 | | 2 | 60 | | 3 | 67 | | 4 | 75 | The environment in which the organism lives can support at most 600 organisms. Assuming the trend continues, after how many years will the environment no longer be able to support the population? A. 12 B. 24 C. 61 D. 82

📝 Answered - In general, which step of the scientific method generally follows forming a hypothesis? A) Making an observation B) Stating a problem C) Identifying variables D) Designing an experiment

📝 Answered - A friction rub is a grating, scratchy sound heard during inspiration and expiration with inflammation of the pleural surfaces.

📝 Answered - Fill in the blank below with the word that best completes the sentence. Natural selection leads to __________ a process of change in a population over time.

📝 Answered - Which technology has been commonly utilized by scientists to manipulate heritable information by separating DNA fragments into a unique pattern that can be compared to DNA fragments? A. Gel electrophoresis B. Gene cloning C. Artificial selection D. Restrictive enzyme analysis

📝 Answered - What is the consequence of Duchenne muscular dystrophy on skeletal muscle fibers? A. Complete regeneration of muscle cells. B. Uncontrolled muscle contractions throughout the body. C. Damage to the sarcolemma leading to muscle fiber necrosis. D. Increase in muscle fiber size and strength.

📝 Answered - Groups of DNA bases that code for types of amino acids occur as A. quintuplets. B. doublets. C. triplets. D. quadruplets.