BIOCHEM OFFICIAL EXAM BANK WITH CORRECT ANSWERS INDICATED 2026/2027 Complete And Study material 478pages LEARNEXAMS

1. In a bacterial cell, the DNA is in the: A) cell envelope. B) cell membrane. C) nucleoid. D) nucleus. E) ribosomes. 2. A major change occurring in the evolution of eukaryotes from prokaryotes was the development of: A) DNA. B) photosynthetic capability. C) plasma membranes. D) ribosomes. E) the nucleus. 3. In eukaryotes, the nucleus is enclosed by a double membrane called the: A) cell membrane. B) nuclear envelope. C) nucleolus. D) nucleoplasm. E) nucleosome. 4. The dimensions of living cells are limited, on the lower end by the minimum number of biomolecules necessary for function, and on the upper end by the rate of diffusion of solutes such as oxygen. Except for highly elongated cells, they usually have lengths and diameters in the range of: A) 0.1 m to 10 m. B) 0.3 m to 30 m. C) 0.3 m to 100 m. D) 1 m to 100 m. E) 1 m to 300 m. 5. Which group of single-celled microorganisms has many members found growing in extreme environments? A) bacteria B) archaea C) eukaryotes D) heterotrophs E) None of the answers is correct. Page 2 6. The bacterium E. coli requires simple organic molecules for growth and energyóit is therefore a: A) chemoautotroph. B) chemoheterotroph. C) lithotroph. D) photoautotroph. E) photoheterotroph. 7. Which is a list of organelles? A) mitochondria, chromatin, endoplasmic reticulum B) peroxisomes, lysosomes, plasma membrane C) proteasomes, peroxisomes, lysosomes D) mitochondria, endoplasmic reticulum, peroxisomes E) All of the answers are correct. 8. Which list has the cellular components arranged in order of INCREASING size? A) amino acid < protein>