The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes. The hollow, grape-like structures are the________.
A. alveoli
B. lamellae
C. parabronchi
D. bronchi
E. opercula
Answer: A
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Two of the main ingredients in plant fertilizer are phosphorus and nitrogen. These elements are required for the synthesis of __________________, respectively, in the cells of the plants
A. DNA and proteins B. proteins and complex carbohydrates C. complex carbohydrates and DNA
Which of the following best describes the relationship between the nucleus and the cytoplasm?
A. The cytoplasm is a fluid that fills the inside of the nucleus B. The nucleus is the fluid and it mixes with the fluid cytoplasm C. The nucleus is an organelle that is surrounded by the cytoplasm D. The cytoplasm is an organelle that is usually found near the nucleus
The 14 species of Darwin's finches on the Galapagos Islands mainly differ in:
a) body size. b) tail length. c) song type. d) coloration. e) bill size.
If a person were to receive such a high dose of radiation that all of the cells were to die in this area, anemia would develop. This place is the ________
A) lymph nodes B) red bone marrow C) thymus D) yellow bone marrow