Biology - Study Mode
[#411] Which feature do prokaryotic and eukaryotic cells share?
Correct Answer
(B) DNA
Explanation
Solution: The common features of prokaryotic and eukaryotic cells are: DNA, the genetic material contained in one or more chromosomes and located in a non membrane bound nucleoid region in prokaryotes and a membrane-bound nucleus in eukaryotes.
[#412] Which of the following contain enzymes for cellular respiration ?
Correct Answer
(D) Mitochondria
Explanation
Solution: Mitochondria contain enzymes for cellular respiration. Mitochondria are known as the powerhouse of the cell.
[#413] The smallest unit that is capable of carrying out life functions is known as
Correct Answer
(B) Cell
Explanation
Solution: The cell is the smallest structural and functional unit of living organisms, which can exist on its own. Therefore, it is sometimes called the building block of life.
[#414] Protein synthesis in a bacterial cell is done by
Correct Answer
(D) Ribosomes
Explanation
Solution: Ribosomes are protein-making factories found in all cells, from humans to bacteria. The ribosome will scan down the RNA, like a train going down tracks, adding in amino acids to the protein being produced. When the ribosome reaches the end of the RNA, the protein is released. This process is called translation.
[#415] Which one is the first organelle to be discovered?
Correct Answer
(B) Nucleus
Explanation
Solution: In 1833, Brown observed and described the nucleus, the first organelle. In 1838, the many and various observations were converted into a cell theory by Schleiden, who proposed that all plant tissues were composed of nucleated cells.