Are viruses alive? this question is debated among scientists throughout the world. consider the following passage. scientific researchers discovered agents that behaved like bacteria causing diseases such as rabies and hoof-and-mouth, but were much smaller. at this time it became the general view that viruses were biologically "alive." this perception changed in 1935 when the tobacco mosaic virus was crystallized and scientists demonstrated that the particles lacked any mechanisms necessary for metabolic function. it was determined that viruses consisted of a nucleic acid, dna or rna, surrounded by a protein shell and the scientific view changed: viruses are complex biochemical mechanisms but not alive. according to the passage, the most important evidence supporting the opinion that viruses are not alive is that they a) cause disease. b) contain dna or rna. c) are much smaller than bacteria. d) do not have a cellular structure.
Answers: 2
Biology, 21.06.2019 20:00
Which group is noted for the independence of gametophyte and sporophyte generations from each other? a) ferns b) mosses, hornworts, and liverworts c) charophytes d) angiosperms e) gymnosperms
Answers: 1
Biology, 21.06.2019 20:00
After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.
Answers: 3
Biology, 21.06.2019 20:10
Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt
Answers: 1
Biology, 21.06.2019 22:00
Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.
Answers: 1
Are viruses alive? this question is debated among scientists throughout the world. consider the fol...
Health, 29.04.2021 16:30
Physics, 29.04.2021 16:30
Mathematics, 29.04.2021 16:30
Mathematics, 29.04.2021 16:30
Mathematics, 29.04.2021 16:30
Mathematics, 29.04.2021 16:40
Mathematics, 29.04.2021 16:40