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.

Complete the following reactions using word and balanced equations including states. dilute phosphoric acid is added with a calcium hydroxide solution.

What is the common name for the compound shown here? enter the common name of the compound shown?

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5