Who is credited with first observing microorganisms?
Robert Hooke
Anton van Leeuwenhoek
Robert Koch
Louis Pasteur
Carolus Linnaeus
The Correct Answer is B
A. Robert Hooke: Robert Hooke is credited with the first observation and description of cells in cork using a compound microscope. His work in 1665 laid the foundation for cell theory, but he did not observe microorganisms such as bacteria or protozoa.
B. Anton van Leeuwenhoek: Anton van Leeuwenhoek, in the late 17th century, was the first to observe and describe microorganisms, which he called “animalcules,” using his single-lens microscopes. He examined pond water, dental plaque, and other samples, documenting bacteria, protozoa, and other microscopic life, establishing the field of microbiology.
C. Robert Koch: Robert Koch was a 19th-century microbiologist who developed methods to isolate and culture specific bacteria and identified causative agents of diseases such as tuberculosis and anthrax. He did not make the initial discovery of microorganisms.
D. Louis Pasteur: Louis Pasteur conducted experiments that disproved spontaneous generation and demonstrated the microbial basis of fermentation and disease. While critical to microbiology, he was not the first to observe microorganisms.
E. Carolus Linnaeus: Carolus Linnaeus developed the binomial system for classifying living organisms and contributed to taxonomy. He did not use microscopes to observe microorganisms.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Viral genomes consist of either DNA or RNA, but never both at the same time. This is a fundamental principle in virology and is used to classify viruses into DNA viruses and RNA viruses. The genome may be single-stranded or double-stranded and can exist in linear, circular, or segmented forms, depending on the specific virus. Unlike human and other living cells, which contain both DNA (as genetic material) and RNA (for protein synthesis), viruses rely on only one type of nucleic acid for replication. This distinction is important because the type of genome determines the virus’s replication strategy, mutation rate, and response to antiviral therapies.
Correct Answer is A
Explanation
Prokaryotic cells, which include bacteria and archaea, do not have a true nucleus or membrane-bound organelles such as mitochondria, endoplasmic reticulum, or Golgi apparatus. Instead, their genetic material is contained in a region called the nucleoid, where a single, circular DNA molecule resides. The nucleoid is not enclosed by a membrane, distinguishing it from the nucleus of eukaryotic cells. Prokaryotic cells rely on the cytoplasm and plasma membrane for metabolic functions and protein synthesis. This structural simplicity allows for rapid growth and reproduction, and it is a key feature used to differentiate prokaryotic cells from eukaryotic cells in microbiology.
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