The nuclear membrane of a bone cell protects the genetic information of the cell. what part of a virus has a similar function ?
a. collar
b. tail
c. sheath
d. capsid

D. Capsid

Explanation:

Nuclear membrane is lipid bilayer that is present in eukaryotic cells to protect the genome. Virus is a single cell that only replicates in the host cells. Viral genome (RNA or DNA) is either protected by capsid (protein shell) in case of non-enveloped viruses or both capsid proteins and lipid layer in case of enveloped viruses. Capsid is also responsible for the transfer and delivery of the genetic material from one viral cell to another. The mechanical properties of capsids vary in different virions that are responsible for DNA packaging and ejection strategies.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.