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Questions in biology

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

[Answered] 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.

[Answered] 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.

[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