A. They can reproduce on their own. B. They have a cell nucleus. C. They need a host cell to reproduce. D. They can move by themselves. 相关知识点: 试题来源: 解析 C。病毒需要宿主细胞才能繁殖,所以不被认为是生物。反馈 收藏
Q. Under what circumstances can viruses reproduce? Q. Most of the plants reproduce by sexual method. Name two plants which can reproduce asexually. Q. When can viruses reproduce? Q. Can viruses reproduce on their own? Q. Can bryophytes reproduce asexually? View More Related Videos Introduction...
Viruses cannot reproduce on their own, and they need to infect a host cell to make copies of themselves. Retroviruses are viruses whose genetic material is composed specifically of RNA, and they can integrate their genetic information into the host's genome after infection. Interestingly, some ...
Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not liv...
and even cancer. They are an extremely small foreign organism that invade healthy cells, and seek to wreak havoc in a healthy human or animal. Viruses are comprised of either RNA or DNA covered in a protein shell, and cannot reproduce on their own, so they rely on their host to survive...
Viruses such asEbola,influenzaandZikamake headlines. They grab our attention with their potential to cause widespread disease and death. But where did these viruses first come from? Unlike bacteria, viruses aren't living organisms —they can't reproduce on their own. Instead, they hijackcellsto ...
Viruses such asEbola,influenzaandZikamake headlines. They grab our attention with their potential to cause widespread disease and death. But where did these viruses first come from? Unlike bacteria, viruses aren't living organisms —they can't reproduce on their own. Instead, they hijackcellsto ...
Viruses. Tiny 1/2 to 1/100 the size of smallest bacterium Nonliving Do not fulfill the criteria for life Do not carry out respiration, grow or move Can. Two Cycles and A Bit of Review Remember that viruses are not able to reproduce on their own. They rely on a ‘host cell’ for re...
Unlike bacteria,viruses can’t reproduce (繁殖) on their own. Instead, they invaded the cells of living organisms to reproduce, spread and take over. But the basic question is, where did viruses first come from? Until now, no clear explanation for their origin exists. “Tracing the origins...
The existence of very large viruses (megaviruses) which contains enough genes to encode about one thousand proteins, more than most bacteria, suggests that they were originally cells which lost the ability to reproduce on their own, adopting instead a parasitic way of life. However the ...