How is the reaction 2H2 + O2? 2H2O described in words?
A) Two molecules of hydrogen combine with two atoms of oxygen to form two molecules of water.
B) Two molecules of hydrogen combine with two molecules of oxygen to form two molecules of water.
C) Two molecules of hydrogen combine with one molecule of oxygen to form two molecules of water.
D) Two atoms of hydrogen combine with one atom of oxygen to form two atoms of water.
E) Two atoms of hydrogen combine with two atoms of oxygen to form two molecules of water.
C) Two molecules of hydrogen combine with one molecule of oxygen to form two molecules of water.
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What developmental landmark occurs at day 25 in humans?
a. primitive streak b. neural tube c. yolk sac d. pharyngeal arches e. somites
A persistent pathogen can evade the host immune system by
A. evolving changes in its envelope structure. B. disrupting complement function. C. producing toxins that inhibit phagocyte movement. D. disrupting immune signaling. E. slowing down its replication.
Suppose you wanted to determine if you should reject the null hypothesis that running a playing fast tempo (as opposed to slow) music in your store has no effect on sales. On 65 randomly selected days with fast tempo music on the average store sales is $2,345 with a sample standard deviation of 45, while on 75 randomly selected days with slow tempo music on the average store sales is $2,555, with a sample standard deviation of 65. What would be the proper t-stat for this hypothesis test?
A. 
B. 
C. 
D. 
Please select the three major mechanisms by which antimicrobial resistance genes are shared and spread among microbial populations.
> Conjugation > Spread from human hosts to bacteria > Transduction > Transformation > Transcription > Taking antibiotics