What I Know , Pretest, Directions: Read the questions carefully. Choose the letter o, correct answer. Write your answer on separate sheet of pape, 1. Which of the following contains all life on earth?, A. Biosphere, B. Community C. Earth D. Ecosyste, 2. Which of the following refers to a chemical structure consisting of tv, atoms?, A. atomic number B. mixture C. molecule D. solution, 3. What is the fundamental unit of structure and function among organ, A cell, B. organ, C. organ system D. tissue, Which of the type of cell that lacks a true nucleus and membrane-b, organelles?, A eukaryotic B. muscle cell C. prokaryotic D. sex ce, What is the form of the genetic materials that take in chromosome, A. Chromatid B. DNA, C. Gene, D. RNA, What is the entire collection of genetic instruction that an organis, A. alleles B. gene expressions C. genomes D., Producers in a food chain or web are, in nature.