Consider statements about scientists: 1. Robert Hooke coined the term 'cell'. 2. Antonie van Leeuwenhoek discovered living microorganisms. 3. Charles Darwin proposed the cell theory. Which are correct? MCQ with Answer and Explanation

Consider statements about scientists: 1. Robert Hooke coined the term 'cell'. 2. Antonie van Leeuwenhoek discovered living microorganisms. 3. Charles Darwin proposed the cell theory. Which are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2 and 3
Answer: Option B
Solution (By JKSSB Mock Tests)
Robert Hooke, in his 1665 book 'Micrographia', described observing dead cork tissue under a microscope and coined the term 'cell' for the small, box-like compartments he saw. Antonie van Leeuwenhoek, using his superior handcrafted single-lens microscopes in the 1670s, was the first person to observe and describe living, single-celled microorganisms, which he called 'animalcules'. Charles Darwin proposed the theory of evolution by natural selection; the cell theory was proposed by Schleiden and Schwann. Thus, statements 1 and 2 are correct.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
Robert Koch is famous for establishing 'Koch's postulates', which are a set of criteria used to:
A. Discover the structure of DNA
B. Develop vaccines against viral diseases
C. Classify bacteria based on Gram staining
D. Establish a causal relationship between a specific microbe and a specific disease

Correct Answer: Option D


Explanation:
Robert Koch, a German physician and microbiologist, formulated Koch's postulates in the late 19th century. These four criteria are designed to establish a causal relationship between a specific microbe and a specific disease. The postulates require that the microbe must be found in all cases of the disease, isolated and grown in pure culture, cause the disease when inoculated into a healthy susceptible host, and be re-isolated from the experimentally infected host.

This question belongs to: Science Biology
Question #2
The enzyme that catalyzes the removal of the RNA primer during DNA replication is:
A. DNA polymerase III
B. Ligase
C. DNA polymerase I
D. Helicase

Correct Answer: Option C


Explanation:
DNA polymerase I has 5' to 3' exonuclease activity to remove RNA primers and fill gaps with DNA. In eukaryotes, RNase H removes primers.

This question belongs to: Science Biology
Question #3
In the endocrine system, the hormone 'Oxytocin' is synthesized in the hypothalamus but is stored and released by the:
A. Thyroid gland
B. Posterior pituitary (Neurohypophysis)
C. Anterior pituitary
D. Adrenal medulla

Correct Answer: Option B


Explanation:
Oxytocin (and ADH/vasopressin) are peptide hormones synthesized by the neurosecretory cells of the hypothalamus (supraoptic and paraventricular nuclei). They are transported down the axons of these neurons and stored in the nerve terminals of the posterior pituitary (neurohypophysis). Upon neural stimulation, they are released directly into the bloodstream from the posterior pituitary. The anterior pituitary synthesizes its own hormones.

This question belongs to: Science Biology