Individuals with the genetic condition sickle cell anemia have hemoglobin coded with the gene that codes for valine instead of glutamic acid. What kind of mutation does this condition result from?
a. a frameshift mutation
b. a missense mutation
c. a chromosomal mutation
d. a silent mutation
Ans: b. a missense mutation
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Which statement is false about prostaglandins?
a. They are local signaling molecules. b. They promote blood flow to injured tissue. c. They cause blood vessels to dilate. d. They act as pheromones. e. They alter chemical conditions in nearby tissues.
Which of the following is false concerning photoautotrophs?
A) They feed themselves and all heterotrophs. B) They prepare glucose by using sunlight. C) They take carbon as carbondioxide. D) Without them life on earth would still be possible.
A biome is a community and the nonliving factors with which it interacts.
Answer the following statement true (T) or false (F)
What is an asteroid?
a. dust and small rock orbiting around the sun b. a ball of ice with a tail c. a small planet d. a small sun with weak solar emissions e. more than one of these