Question

1. which structures carry out life functions within cells? a. tissues b. organ systems c. organelles d. organs 3. in a cell, protein synthesis is the primary function of a. ribosomes b. mitochondria c. chloroplasts d. vacuoles 4. the largest amount of dna in a plant cell is contained in a. a nucleus b. a chromosome c. a protein molecule d. an enzyme molecule 5. an organelle that releases energy for metabolic activity in a nerve cell is the a. chloroplast b. ribosome c. mitochondrion d. vacuole

Explanation:

1. Organelles are the structures within cells that perform life - functions. Tissues, organs, and organ systems are higher - level biological structures.
2. Ribosomes are the sites of protein synthesis in the cell. Mitochondria are for energy production, chloroplasts are for photosynthesis in plant cells, and vacuoles are for storage.
3. The nucleus contains the largest amount of DNA in a plant cell. Chromosomes are within the nucleus, and proteins and enzymes do not contain the majority of the cell's DNA.
4. Mitochondria are the power - houses of the cell, releasing energy for metabolic activity. Chloroplasts are for photosynthesis, ribosomes for protein synthesis, and vacuoles for storage.

Answer:

1. C. organelles
2. A. ribosomes
3. A. a nucleus
4. C. mitochondrion