A contributing factor to the spread of the SARS virus during the initial 2003 outbreak was
A) transmission of the virus in healthcare settings.
B) similarity to 1918 influenza outbreak.
C) air pollution in crowded urban environments.
D) high smoking rates in Asia.
E) global air travel.
Answer: E
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The thermostable enzyme most commonly used in PCR is reverse transcriptase.
Answer the following statement true (T) or false (F)
One difference between sieve-tube cells and vessels is that sieve-tube cells are ________, but vessels are dead.
A. hollow B. alive C. nucleated D. more spherical E. placed end to end
Which structure controls the activity of all the others?
A) ovary B) testis C) hypothalamus D) pituitary gland
Adjacent water molecules are connected by the ________.
A) sharing of electrons between the hydrogen of one water molecule and the oxygen of another water molecule
B) electrical attraction between the hydrogen of one water molecule and the oxygen of another water molecule
C) sharing of electrons between adjacent oxygen molecules
D) electrical attraction between the hydrogen atoms of adjacent water molecules