Day-740
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DAILY MCQ
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Question 1 of 5
1. Question
1. Consider the following statements about the risks involved in human spaceflight:
1. The risk of radiation exposure increases significantly for astronauts during long-duration space missions.
2. Spacecraft operating in Low Earth Orbit (LEO) are immune to the effects of microgravity.
3. Psychological stress can affect astronauts’ performance during missions, especially those that are prolonged.
How many of the above statements are correct?Correct
Answer: B
Explanation:
Statement 1 is correct: Astronauts on long-duration missions are exposed to higher levels of cosmic radiation, which poses significant health risks, including increased cancer risk.
Statement 2 is incorrect: Spacecraft in Low Earth Orbit (LEO) are not immune to the effects of microgravity. In fact, they operate in a microgravity environment, which affects various biological and physical processes.
Statement 3 is correct: Psychological stress is a significant concern during prolonged missions, as factors like isolation, confinement, and limited social interactions can impact astronauts’ mental health and performance.Incorrect
Answer: B
Explanation:
Statement 1 is correct: Astronauts on long-duration missions are exposed to higher levels of cosmic radiation, which poses significant health risks, including increased cancer risk.
Statement 2 is incorrect: Spacecraft in Low Earth Orbit (LEO) are not immune to the effects of microgravity. In fact, they operate in a microgravity environment, which affects various biological and physical processes.
Statement 3 is correct: Psychological stress is a significant concern during prolonged missions, as factors like isolation, confinement, and limited social interactions can impact astronauts’ mental health and performance. -
Question 2 of 5
2. Question
2. Consider the following statements about autoimmune diseases:
1. Autoimmune diseases occur when the immune system mistakenly attacks healthy cells in the body.
2. Multiple sclerosis is primarily characterized by the destruction of insulin-producing cells in the pancreas.
3. Rheumatoid arthritis is an autoimmune disease that primarily affects the joints, leading to inflammation and pain.
How many of the above statements are correct?Correct
Answer: B
Explanation:
Statement 1 is correct. Autoimmune diseases indeed occur when the immune system mistakenly targets and attacks healthy cells in the body.
Statement 2 is incorrect. Multiple sclerosis is characterized by the immune system attacking the protective myelin sheath covering nerve fibers, not the destruction of insulin-producing cells in the pancreas; that condition is related to diabetes mellitus.
Statement 3 is correct. Rheumatoid arthritis is an autoimmune disorder that primarily affects the joints, causing inflammation, pain, and potential joint damage.Incorrect
Answer: B
Explanation:
Statement 1 is correct. Autoimmune diseases indeed occur when the immune system mistakenly targets and attacks healthy cells in the body.
Statement 2 is incorrect. Multiple sclerosis is characterized by the immune system attacking the protective myelin sheath covering nerve fibers, not the destruction of insulin-producing cells in the pancreas; that condition is related to diabetes mellitus.
Statement 3 is correct. Rheumatoid arthritis is an autoimmune disorder that primarily affects the joints, causing inflammation, pain, and potential joint damage. -
Question 3 of 5
3. Question
3. Consider the following statements about quantum entanglement:
1. Quantum entanglement describes a phenomenon where the quantum states of two particles are independent of each other, regardless of the distance between them.
2. When two particles are entangled, measuring the state of one particle instantly determines the state of the other, even if they are separated by large distances.
3. Quantum entanglement violates the principle of locality, which states that objects are only influenced by their immediate surroundings.
How many of the above statements are correct?Correct
Answer: B
Explanation:
Statement 1 is incorrect. Quantum entanglement involves particles whose quantum states are not independent. They are correlated in such a way that the state of one particle is directly related to the state of the other, regardless of the distance.
Statement 2 is correct. In an entangled pair, measuring the state of one particle immediately determines the state of the other, even if they are far apart, a phenomenon often referred to as “spooky action at a distance.”
Statement 3 is correct. Quantum entanglement appears to violate the principle of locality, which suggests that objects are only influenced by their immediate surroundings, but in quantum mechanics, entangled particles influence each other regardless of distance.Incorrect
Answer: B
Explanation:
Statement 1 is incorrect. Quantum entanglement involves particles whose quantum states are not independent. They are correlated in such a way that the state of one particle is directly related to the state of the other, regardless of the distance.
Statement 2 is correct. In an entangled pair, measuring the state of one particle immediately determines the state of the other, even if they are far apart, a phenomenon often referred to as “spooky action at a distance.”
Statement 3 is correct. Quantum entanglement appears to violate the principle of locality, which suggests that objects are only influenced by their immediate surroundings, but in quantum mechanics, entangled particles influence each other regardless of distance. -
Question 4 of 5
4. Question
4. Match the following types of RNA with their functions:
Types of RNA – Functions
A. mRNA (Messenger RNA) – 1. Carries genetic information from DNA
B. tRNA (Transfer RNA) – 2. Transports amino acids to ribosomes
C. rRNA (Ribosomal RNA) – 3. Forms the core of ribosomes
D. snRNA (Small nuclear RNA) – 4. Involved in RNA splicing
Select the correct answer using the codes given below:Correct
Answer: A
Messenger RNA (mRNA), transfer RNA (tRNA), ribosomal RNA (rRNA), and small nuclear RNA (snRNA) are all types of RNA that play different roles in protein synthesis and other cellular processes. The following table compares their functions, location in the cell and structure –
The following diagram represents their structure and functions.
Incorrect
Answer: A
Messenger RNA (mRNA), transfer RNA (tRNA), ribosomal RNA (rRNA), and small nuclear RNA (snRNA) are all types of RNA that play different roles in protein synthesis and other cellular processes. The following table compares their functions, location in the cell and structure –
The following diagram represents their structure and functions.
-
Question 5 of 5
5. Question
5. Consider the following statements about transcriptional regulation:
1. The enhancer region of DNA can be located far from the gene it regulates.
2. Repressors bind to promoters to initiate transcription.
3. RNA polymerase is recruited to the promoter region during transcription initiation.
How many of the above statements are correct?Correct
Answer: B
Explanation:
Statement 1 is correct. Enhancer regions can be located thousands of base pairs away from the gene they regulate and still influence its transcription by looping the DNA.
Statement 2 is incorrect. Repressors bind to operator regions or silencers to inhibit transcription, not to promoters. Promoters are binding sites for activators of transcription factors that initiate transcription.
Statement 3 is correct. RNA polymerase is indeed recruited to the promoter region of a gene during transcription initiation.Incorrect
Answer: B
Explanation:
Statement 1 is correct. Enhancer regions can be located thousands of base pairs away from the gene they regulate and still influence its transcription by looping the DNA.
Statement 2 is incorrect. Repressors bind to operator regions or silencers to inhibit transcription, not to promoters. Promoters are binding sites for activators of transcription factors that initiate transcription.
Statement 3 is correct. RNA polymerase is indeed recruited to the promoter region of a gene during transcription initiation.
