Consider an organism whose karyotype shows it to have a total of 60 chromosomes. How many chromosomes would be contained in the sperm of this organism?
A. 90
B. 46
C. 23
D. 30
E. 60
Answer: D
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Low temperatures slow the activity of rubisco but enhance its ability to select CO2 over O2. Low temperatures thus __________
A. increase photorespiration rates B. lower the production of reactive oxygen species C. increase the production of reactive oxygen species D. increase photosynthesis rates E. increase photorespiration
Answer the following statements true (T) or false (F)
1. No microorganisms are able to live in the stomach because of the extremely low pH of the stomach contents. 2. Microbial communities known as biofilms are interesting, but they have no medical significance. 3. Microorganisms are unable to live in the colon owing to the lack of oxygen there. 4. Some of the bacteria used in bioremediation are naturally occurring, but others have been genetically engineered. 5. Many of the members of our indigenous microflora have the potential to cause disease.
The virus known as H1N1 (swine flu):
a. has a high death rate b. is seldom transmitted person-to-person c. has no reliable treatment d. has been harnessed by a vaccine e. occasionally infects people who have direct contact with birds
The first person to suggest a general definition of species was
A. Charles Darwin. B. Carolus Linnaeus. C. John Ray. D. Joseph Priestly.