Which of the following is true of ribozymes?
A. They are made up of RNA.
B. They are made up of protein.
C. They are made up of DNA.
D. They cannot catalyze reactions.
Answer: A
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Digestion and absorption allow vertebrates to use nutrients to
A. make ATP. B. repair tissue damage. C. deliver oxygen to cells. D. form bone. E. perform all of the functions given.
In a population of 100 Douglas squirrels, the
birth rate is 10 per year and the death rate is 20 per year. The per capita growth rate of Douglas squirrels is ___ per squirrel per year.
a. 0.2 b. 0.1 c. 0.0 d. -0.1 e. -0.2
Astronauts returning to Earth from an extended stay in space have to be extremely careful not to break a bone. It takes several weeks to restore normal bone strength. Which would be the best regimen to rebuild the lost bone tissue?
A) Stay inactive, avoiding exercise until the lost bone tissue is rebuilt. B) Hit the gym and get going with a few weeks of heavy weight lifting. C) Several weeks of swimming will rebuild all lost bone mass. D) Start with walking and build up to jogging, with an extra regimen of light weight lifting in the gym.
If the frequencies of recessive and dominant alleles in a population do not change over time, that population
a) is evolving b) is migrating c) is exhibiting genetic drift d) is in Hardy-Weinberg equilibrium e) will soon be extinct