A mRNA containing introns is a ________.
A. proenzyme
B. pre-mRNA
C. gene
D. codon
E. ribosomal RNA (rRNA)
Answer: B
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Which of the following statements concerning cells is incorrect?
a. cells serve as the living building blocks of the body. b. the average human cell is about one hundred times smaller than the smallest particle visible by the unaided eye. c. inanimate chemical molecules are organized within each cell into a living entity. d. cells are generally colorless and transparent so they must be stained for visualization under a microscope. e. the three major subdivisions of a cell are the plasma membrane, the nucleus, and the cytoplasm.
Extrinsic control of arteriolar radius
a. is accomplished primarily by the sympathetic nervous system. b. is important in the regulation of arterial blood pressure. c. can be overridden by local adjustments. d. is accomplished primarily by the sympathetic nervous system and is important in the regulation of arterial blood pressure. e. all of these answers.
________ are secreted by one cell into the tissue fluid, diffuse to nearby cells in the same tissue, and stimulate their physiology.
A. Hormones B. Neurotransmitters C. Neuromodulators D. Paracrines E. Parahormones
True or false? Synthesis reactions are also called catabolic reactions
Indicate whether the statement is true or false.