Question

15 multiple choice 2 points the __________ is the site of photosynthesis. ribosome mitochondria cell wall chloroplast 16 multiple choice 2 points the breakdown of glucose into pyruvate occurs in ________. glycolysis the electron transport chain chemiosmosis the krebs cycle 17 multiple choice 2 points when muscle cells work in the absence of oxygen, __________ builds up. nitrogen lactic acid pyruvic acid

Explanation:

1. Chloroplasts contain chlorophyll and are the organelles where photosynthesis takes place. Ribosomes are for protein - synthesis, mitochondria for cellular respiration, and the cell wall provides structure and protection.
2. Glycolysis is the first step of cellular respiration where glucose is broken down into pyruvate. The electron - transport chain generates ATP using electron carriers, chemiosmosis is related to the movement of protons to generate ATP, and the Kreb's cycle further breaks down pyruvate to generate energy - carrying molecules.
3. In the absence of oxygen, muscle cells undergo anaerobic respiration, and lactic acid builds up as a result of the conversion of pyruvate. Nitrogen is not a product of anaerobic respiration in muscle cells, and pyruvic acid is converted to lactic acid under anaerobic conditions.

Answer:

1. D. chloroplast
2. A. glycolysis
3. B. lactic acid