This image shows an area in which a glacier has melted. What is indicated by the number “2”?
a. competition for food resources
b. resource partitioning between two competing species
c. emergence of climax species
d. colonization by pioneer species
e. secondary succession
ANSWER: d
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Which of the following is not considered a micronutrient?
A. Copper (Cu) B. Magnesium (Mg) C. Manganese (Mn) D. Zinc (Zn)
What is the purpose of the platelets, an important cell type within human blood?
A) They provide glucose to tissues. B) They carry oxygen to body cells. C) They help form a clot at the site of a wound. D) They carry antibodies against infections.
Which of the following statements regarding vitamins is true?
A) They are simple inorganic compounds. B) They must be ingested in large quantities. C) They can serve as coenzymes or parts of coenzymes. D) They are major sources of dietary calories.
The endosymbiotic theory suggests that both _____ were once free-living organisms that lived as parasites within ancient prokaryotes.
A) centrioles and nucleosomes B) mitochondria and ribosomes C) Golgi bodies and lysosomes D) chloroplasts and mitochondria