Which one of the following is the correct sequence in increasing complexity?
- A.Protein - Organism - Tissue - Organ
- B.Protein - Organ - Tissue - Organism
- C.Protein - Organism - Organ - Tissue
- D.Protein - Tissue - Organ - Organism
Correct answer
Explanation
The correct answer is D, Protein - Tissue - Organ - Organism. Living things are built up level by level: molecules such as proteins form cells, cells form tissues, tissues form organs, organs form organ systems, and these together make an organism.
A protein is a large molecule made of amino acids. Many such molecules make up a cell, the basic unit of life. A group of similar cells doing one job is a tissue, such as muscle tissue. Different tissues working together form an organ, such as the heart, which has muscle, nerve and connective tissue. Organs combine into organ systems, and all the systems together make a complete organism, such as a human being.
A is wrong because it puts the organism, the most complex level, before tissue and organ.
B is wrong because an organ is made of tissues, so the organ cannot come before the tissue.
C is wrong because it places organism first and puts tissue after organ.
Exam tip: levels of organisation – molecule, cell, tissue, organ, organ system, organism.
Practice Questions
View allWhich of the following are nitrogen-fixing plants?
1. Alfalfa
2. Amaranth
3. Chickpea
4. Clover
5. Purslane (Kulfa)
6. Spinach
Select the correct answer using the code given below:
- A.1, 3 and 4 only
- B.1, 3, 5 and 6 only
- C.2, 4, 5 and 6 only
- D.1, 2, 4, 5 and 6
Show answer
Alfalfa, chickpea and clover are legumes, and legumes fix nitrogen. Plants of the legume family (Fabaceae) carry root nodules that house Rhizobium bacteria.
Read the full explanation →The mass number of an element is NOT changed when it emits
- A.Alpha and Beta radiations only
- B.Alpha and Gamma radiations only
- C.Beta and Gamma radiations only
- D.Alpha, Beta and Gamma radiations
Show answer
Neither beta nor gamma emission changes the total number of protons and neutrons in a nucleus, so the mass number stays the same.
Read the full explanation →Which one among the following statements about facilitated transport in plants is correct?
- A.All passive transports are types of facilitated transport.
- B.Facilitated transport is an example of active transport.
- C.Water moves across plasma membrane by active transport.
- D.Facilitated transport requires assistance of carrier proteins.
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In facilitated transport, molecules cross the membrane with the help of membrane proteins, while still moving down their concentration gradient.
Read the full explanation →Who among the following has coined the term 'Quark', the fundamental particles that make up protons and neutrons in an atomic nucleus ?
- A.Richard Feynman
- B.Murray Gell-Mann
- C.Albert Einstein
- D.Niels Bohr
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The American physicist Murray Gell-Mann proposed quarks in 1964 and gave them their name. Gell-Mann, and independently George Zweig, suggested that protons, neutrons and other such particles are built from smaller units.
Read the full explanation →The spindle fibre is attached to which of the following specific regions of the chromosomes?
- A.Kinetochore
- B.Chromonema
- C.Telomere
- D.Centriole
Show answer
Spindle fibres attach to the kinetochore, a disc-shaped protein structure on the centromere of each chromosome. During cell division the spindle, made of microtubules, pulls the copies of each chromosome apart.
Read the full explanation →