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Alborosie
3 years ago
15

According to cell theory, viruses are considered nonliving because they

Biology
2 answers:
jarptica [38.1K]3 years ago
6 0
D) lack the ability to reproduce without as stated in cell theory
iris [78.8K]3 years ago
3 0

Answer: D) lack the ability to reproduce without a host.

Explanation:

Those who argue that the virus is not a living thing assume that he has no free life, for its replication is possible only within a living cell. Also, some of these agents can crystallize when subjected to adverse situations. Although they can replicate, viruses do not have the enzymatic apparatus sufficient for replication, thus requiring the cellular machinery to complete its replicative cycle, which makes it a mandatory intracellular parasite.

Its apparent fragility, being strictly cell-dependent, is dismissed by its ability to control and redirect cellular metabolism to its benefit. Despite the low structural complexity, it can cause major damage to the host cell, even though morphologically presenting only genetic material, a capsid and, in some viruses, an envelope.

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To which organelle does a C-terminal signal peptide sequence of the four amino acids KDELdirect peptides?
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Answer:

Endoplasmic reticulum.

Explanation:

Protein synthesis, sorting and transport is the important mechanism for the synthesis of protein in the body and the transport of the protein to its specific site or organ. The protein must reaches to its final destination for its proper functioning.

KDEL ( K- leucine, D is aspartic acid, E is glutamic acid and L is lysine ) is the stretch of a specific amino acid that are responsible for the protein molecule to target at its specific site. KDEL is specific for the transport of peptides to the endoplasmic reticulum.

Thus, the correct answer is option (A).

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3 years ago
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Fittoniya [83]

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