Sea stars eat:a
large fish.
b. mostly algae.
c. sea weed.
d. mostly crustaceans and mollusks.
e. debris on the bottom.
d
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After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.
A. All the vegetation that had been produced prior to the historic low decayed, releasing carbon dioxide. B. Higher oxygen levels resulted in the proliferation of aerobic bacteria; their respiration released large amounts of carbon dioxide. C. Higher temperatures caused an increase in plant growth, resulting in an increase in the amount of carbon dioxide synthesized. D. Lower temperatures resulted in reduced plant growth; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. Higher oxygen levels promoted large-scale fires across the landscape; the breakdown of organic molecules in these fires released carbon dioxide.
Which of the following cells relies solely on anaerobic metabolism of glucose?
skeletal muscle cells liver cells kidney cells red blood cells
What type of mutation leads to a frameshift in the reading of DNA?
A) All point mutations B) Insertions only C) Deletions only D) Both insertions and deletions
Recognition proteins, such as those embedded on the surface of red blood cells, are composed of
A) glycoproteins. B) phospholipases. C) nucleic acids. D) steroids.