Severe acute respiratory syndrome (SARS) is caused by SARS-associated coronavirus (SARS-CoV). The diagram shows the structure of SARS-CoV. SARS emerged as an infectious human disease in 2002. Several years of research have led to the conclusion that SARS-CoV originated in a single colony of bats. These bats served as a reservoir for a form of the virus which could not infect humans. SARS-CoV is hypothesized to have mutated in such a way that it gained the ability to infect humans.

In what way are the glycoproteins on SARS-CoV involved in its ability to infect humans?
A.
The glycoproteins help the virus move around the human respiratory tract so it can damage the lungs.
B.
The glycoproteins help the virus travel in the air so it can spread among humans.
C.
The glycoproteins interact with receptors on a human cell so the virus can enter the cell.
D.
The glycoproteins interact with a human cell's DNA replication machinery so the virus can replicate.

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light-years

magnitude

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

it marks things for degradation via the proteasome. it alters there celluar location.

i think the answer is c hope this