Q. 71. In context of difference between prokaryotic and eukaryotic cells, consider the following statements:
1. Prokaryotic cells lack a cell wall, while all eukaryotic cells have a cell wall.
2. Prokaryotic cells have a well-defined, membrane-bound nucleus while eukaryotic cells have a simple cell structure without a membrane-bound nucleus.
3. Eukaryotic cells contain multiple linear chromosomes, whereas prokaryotic cells have a single circular chromosome.
How many of the above statements are true?
(A) Only one
(B) Only two
(C) All three
(D) None
Answer:
Explanation:
Q. 72. With reference to ‘Neutrinos’, consider the following statements:
1. They are electrically neutral.
2. They do not interact with matter.
3. They are produced in nuclear reactions.
How many of the statements given above are correct?
(A) Only one
(B) Only two
(C) All three
(D) None
Answer:
Explanation:
Q. 73. Consider the following statements:
1. Gamma-ray bursts (GRB) are the brightest electromagnetic events known to occur in the universe.
2. GRBs are believed to be associated with supernova explosions and the collapse of massive stars.
Which of the statements given above is/are correct?
(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2
Answer:
Explanation:
Q. 74. Consider the following statements:
1. A genome is made up exclusively of genes that code for proteins.
2. Genomes are found only in eukaryotic organisms like plants and animals.
Which of the statements given above is/are correct?
(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2
Answer:
Explanation:
Q. 75. Which of the following is a primary scientific goal of NASA’s Curiosity rover?
(A) To search for signs of past or present life on Mars
(B) To establish a human colony on Mars
(C) To test new rocket technologies for future missions
(D) To map the entire surface of Mars in high resolution
Answer:
Explanation: