Microtubules
A. are a component of mitochondria.
B. are the smallest components of the cytoskeleton.
C. provide structure and support to the cytoplasm.
D. contain the protein myosin.
E. are solid, supporting rods of protein.
C
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Which property of diffusion best helps explain the necessity of the circulatory system in multicellular organisms?
A) Diffusion rate is inversely related to molecule size. B) Diffusion is rapid over short distances but much slower over long distances. C) Molecules move from an area of higher concentration to an area of lower concentration. D) Diffusion can take place in an open system or across a partition that separates two systems.
The following is a list of structures of the male reproductive tract.
1. ductus deferens 2. urethra 3. ejaculatory duct 4. epididymis Identify the order in which sperm pass through these structures from the testes to the penis. A) 1, 4, 3, 2 B) 4, 1, 3, 2 C) 4, 1, 2, 3 D) 4, 3, 1, 2 E) 1, 3, 4, 2
______ is what occurs when a protein's structure and function is lost because of exposure to extreme heat or chemical factors.
Fill in the blank(s) with the appropriate word(s).
What part of the femur articulates with the tibia?
A. Linea aspera B. Patellar surface C. Head D. Condyles