Which component is present in some viruses but absent in others?

A.) nucleic acid

B.) capsid

C.) envelope

D.) cell membrane

What are 3 polar sub climates

What is taxonomy? a. the scientific study of how living things are classified b. the name of Aristotle's classification system c. the process used by geologists to classify rocks d. the process of observing an organism's behavior

Which choice describes DNA after semi-conservative replication has taken place?

Carbohydrates always contain protein. true or false

Boiling water kills bacteria ... does freezing?

Which finding would have disproved Virchow's hypothesis? 1.) Animalcules are not organisms. 2.) Animals are made of non-cell-based matter. 3.) Plants are made of non-cell-based matter. 4.) Cells can generate from nonliving matter.

Which of these events happens during M phase in the cell cycle? O A. The nucleus of a cell divides into two identical nuclei. O B. All of a cell's chromosomes are copied when DNA replicates. . The cell's DNA is checked for errors in replication. O D.

Which phylum includes animals that lack tissues? Cnidaria Porifera Platyhelminthes Arthropoda Chordata

True or False: SIV has a high mortality rate in apes and monkeys who are infected with the virus.

In the absence of lactose, the cell transcription of DNA is blocked when ...