What is not a characteristic of viruses? A. Have cellular structure B. Require a host cell to reproduce C. Can cause diseases D. Very small in size 相关知识点: 试题来源: 解析 A。病毒没有细胞结构。病毒需要宿主细胞才能繁殖,能引起疾病,体积非常小。
Avoid others when you have active signs or symptoms.Stay home as much as possible. Avoid crowds if you must go out. Do not have close contact with someone who is sick. Ask about vaccines you may need.Talk to your healthcare provider about your vaccine history. Your provider will tell you...
Along with the development of society, more and more problems are brought to our attention, one of the most serious issue is the gray population. Nevertheless, the significance of elderly people in society cannot be overstated. As...
There are many different types of computer viruses and all of them can be devastating. As they spread, they can steal personal information, cripple computer performance, and wreak all kinds of other havoc. Read on to learn what a computer virus is. Then learn how to protect yourself against...
the target computer is infected by files on an external storage device. Rebooting the system will trigger the virus, which then modifies or even replaces the existing boot code. When the system is booted next, the virus will be loaded and immediately run. Boot viruses are not as common now...
How big are viruses? How much smaller are most viruses in comparison to bacteria? Quite a bit. With a diameter of 220 nanometers, themeaslesvirus is about eight times smaller thanEscherichia colibacteria; for reference, one nanometer is equal to 0.000000039 inches. At 45 nm, thehepatitisvirus...
A Trojan horse virus is a type of malware that disguises itself within legitimate applications and software. Discover how Trojans work and how to prevent Trojan attacks and protect users from the latest spyware, threats, and viruses.
most closely guarded part of the body. Locked safely behind the blood-brain barrier, it was broadly free of the harm of viruses and the battles started by the immune system(免疫系统). Then,about 20 years ago, some researchers began to won...
Viruses be viruses. 我发现了世界病毒的存在后病毒在我面前已经不装了它们在其他人面前还伪装一下………but I already won the fight. The end. I won. The end. viruses just don’t want to acknowledge they lost. like any losing party in a war. The rest is just sports. As if I don’t alre...
What is community-acquired pneumonia (CAP)?CAP is a lung infection that you get outside of a hospital or nursing home setting. Your lungs become inflamed and cannot work well. CAP may be caused by bacteria, viruses, or fungi.What increases my risk for CAP?