General Science Jkssb Biology Set 1 Mcqs (605 MCQs) | JKSSB & SSC Quiz

General Science

jkssb biology set 1 mcqs

Download PDF

Topics

jkssb physics set 1 mcqs jkssb chemistry set 1 mcqs jkssb biology set 1 mcqs

Practice Questions

605 Total
Question 171 Discuss
Ask a Friend

Which of the following was discovered by GN Ramachandran?

A
Golgi bodies
B
Plasma membrane
C
Triple helical structure of collagen
D
Fluid mosaic model of a cell

Answer & Explanation

Correct Option: C

G.N. Ramachandran was a pioneering Indian biophysicist who discovered the triple-helical structure of collagen in 1954. He also created the Ramachandran plot to help understand peptide structure.
Question 172 Discuss
Ask a Friend

Who is credited with discovering ribosomes using electron microscopy?

A
Albert Von Kolliker
B
George E Palade
C
Pierre Joseph Pelletier
D
James Thomson

Answer & Explanation

Correct Option: B

Romanian-American cell biologist George E. Palade discovered ribosomes in 1955 by observing them as dense particles in the cytoplasm using an electron microscope, earning him a Nobel Prize.
Question 173 Discuss
Ask a Friend

Identify the INCORRECT pair of cell shape types and their examples.

A
Elongated - Muscle cells
B
Oval - Chlamydomonas
C
Irregular - Amoeba
D
Oblong - Nerve cells

Answer & Explanation

Correct Option: D

Nerve cells (neurons) are typically long and heavily branched to transmit electrical signals over long distances throughout the body, not oblong.
Question 174 Discuss
Ask a Friend

Which of the following is commonly found in the salivary glands of dipteran insects?

A
giant chromosome polytene
B
presence of fat digestive enzymes
C
giant chromosome lampbrush
D
presence of minute chromosomes

Answer & Explanation

Correct Option: A

Polytene chromosomes are giant, multi-stranded chromosomes found in the salivary glands of certain dipteran insects, like the fruit fly Drosophila. They undergo repeated rounds of DNA replication without cell division.
Question 175 Discuss
Ask a Friend

In which of the following animals are the stinging capsules located around the mouth and on the tentacles?

A
Taenia
B
Nereis
C
Adamsia
D
Ascaris

Answer & Explanation

Correct Option: C

Adamsia is a genus of sea anemones belonging to the phylum Cnidaria. Cnidarians possess specialized stinging cells called cnidocytes on their tentacles to capture prey and defend against predators.
Question 176 Discuss
Ask a Friend

Which chromosome is involved in the production of 'masked' mRNAs for early development?

A
Sex chromosome
B
Lampbrush chromosome
C
Polytene chromosome
D
Autosomal chromosome

Answer & Explanation

Correct Option: B

Lampbrush chromosomes are large, transcriptionally active chromosomes found in the oocytes of most animals. They synthesize large amounts of RNA, including 'masked' maternal mRNAs needed for early embryonic development.
Question 177 Discuss
Ask a Friend

The main location for ATP production in a eukaryotic cell is:

A
Mitochondria
B
Nucleus
C
Ribosome
D
Lysosome

Answer & Explanation

Correct Option: A

The mitochondria are the main site for cellular respiration and ATP production in eukaryotic cells. Through oxidative phosphorylation, they generate the chemical energy needed to power the cell's biochemical reactions.
Question 178 Discuss
Ask a Friend

What is the name of the disease that can be caused by Vitamin D deficiency in children?

A
Osteoporosis
B
Scurvy
C
Rickets
D
Bleeding diathesis

Answer & Explanation

Correct Option: C

Rickets is a childhood bone disorder caused by a lack of vitamin D, calcium, or phosphate, leading to softening and weakening of the bones. Vitamin D is essential for the body to absorb calcium effectively.
Question 179 Discuss
Ask a Friend

Which of the following mature mammalian cells typically lacks a nucleus and organelles?

A
Guard cells
B
Red blood cells
C
White blood cells
D
Nerve cells

Answer & Explanation

Correct Option: B

Mature mammalian red blood cells (erythrocytes) intentionally extrude their nucleus and other cellular organelles during development to maximize internal space for hemoglobin, allowing them to efficiently transport oxygen.
Question 180 Discuss
Ask a Friend

Who among the following was the first to describe the nucleus as a cell organelle?

A
Robert Brown
B
Robert Koch
C
LucioFontana
D
Eduard Strasburger

Answer & Explanation

Correct Option: A

Scottish botanist Robert Brown first described the cell nucleus in 1831 while observing the epidermal cells of orchid leaves. His detailed observations established the nucleus as a fundamental component of eukaryotic cells.
Previous Next