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 the virus travel in the air so it can spread among humans.
  b. 
the glycoproteins interact with a human cell's dna replication machinery so the virus can replicate.
  c. 
the glycoproteins the virus move around the human respiratory tract so it can damage the lungs.
  d. 
the glycoproteins interact with receptors on a human cell so the virus can enter the cell.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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idk what is it? is this a question that you know the answer or u dont

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol