IgA antibodies are involved in innate immunity.
Answer the following statement true (T) or false (F)
False
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The density of Comet Halley was found to be about 0.2 g/cm3 . This implies that Comet Halley
a. is composed of about 50% rock and 50% frozen water and methane. b. is loosely packed ices with a small amount of rocky material. c. formed in the inner solar system and was ejected by Jupiter to the Kuiper belt. d. is really an S-type asteroid. e. was once a moon of Neptune and was ripped away by a large impact.
Which of the following is an example of a protein that can read the sequence of DNA without opening the double helix?
A) RNA polymerase B) DNA polymerase C) helicase D) transcription factor E) primase
Decomposers recycle materials at ____ trophic
level(s). a. the first b. the second c. the third d. the fourth e. any of these
Which of the following is NOT true about prolonged
drought? a. It is very rare. b. Some are known to have lasted more than 200 years. c. It contributed to the collapse of the Mayan civilization. d. Afghanistan has recently suffered its worst in 100 years. e. It impacts global food supplies.