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Questions in biology

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] Which of the following is NOT correct about the small intestine? A. It contains villi. B. It absorbs water. C. It secretes digestive enzymes. D. It absorbs most nutrients.

[Terjawab] The fact that women who have not had children live longer than others with the same health habits is consistent with which theory of aging? A. wear-and-tear B. cellular-aging C. genetic adaptation D. cellular-error

[Terjawab] What occurs during the latent period of a muscle twitch? A. Action potentials are taking place, leading to internal mechanical changes. B. Muscle fibers relax completely. C. The muscle contracts immediately with maximum strength. D. Calcium ions return to the sarcoplasmic reticulum.

[Terjawab] What plant does modern day corn come from? A. Teosinte B. Fiber crops C. Sunflowers D. Mustard family

[Terjawab] What term describes the movement and absorption of nutrients and water in plants? A. Assimilation B. Active transport C. Passive transport D. Food energy

[Terjawab] What will happen to the reaction if you add a certain inhibitor or activator to the substrate having allosteric enzyme set up? A. Activator binds to active site to initiate the reaction. B. Activator binds to regulatory site to activate the reaction. C. Inhibitor binds to active site to speed up the reaction. D. Inhibitor binds to regulatory site to increase rate of reaction. Sleeping sickness is transmitted by A. eating contaminated food. B. droplet infection. C. biting of tsetse flies. D. sexual intercourse.

[Terjawab] 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

[Terjawab] 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

[Terjawab] 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