From which of the following processes did the first oxygen molecules come from?
a. aerobic respiration
b. anaerobic respiration
c. the oxidization of water
d. the reduction of water
Ans: c. the oxidization of water
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The first level of gene regulation occurs along the chromosome, through chemical modifications of the DNA or histones
A. true B. false
You are working with a specific enzyme-catalyzed reaction in the lab. You are a very careful experimentalist, and as a result, at the beginning of each of your experiments, you measure the temperature in the lab. On days 1 through 5, the temperature in the lab was 20oC. Today is day 6 of your experiment, and the temperature in the lab is 30oC. How do you predict that this will alter the rate of your enzyme-catalyzed reaction?
A. It could possibly increase or decrease the rate B. It will decrease the rate C. it will not affect the rate D. It will increase the rate
The monitoring of blood oxygen levels within the body is done by what type of receptor?
Select one: a. thermoreceptor b. chemoreceptor c. mechanoreceptor d. photoreceptor e. proprioceptor
How is pneumonic plague transmitted?
A. inhalation of respiratory aerosols from a person infected with Yersinia pestis B. bite of a flea carrying Yersinia pestis C. fomite contact D. contact with the blood of a person infected with Yersinia pestis E. bite of a tick carrying Yersinia pestis