Biology problems
- 1. Which organelle is the control center of a cell?
Options- A. Nucleus
- B. Cytoplasm
- C. Cell membrane
- D. endoplasmic reticulum Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Nucleus
Explanation:
Nucleus serves as the control center for cell metabolism and reproduction.
- 2. Pressure, pain, and temperature receptors in the skin are
Options- A. Exteroceptors
- B. Proprioceptors
- C. Interoceptors
- D. Mechanoreceptors Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
Correct Answer: Exteroceptors
- 3. Select the correct statement about oxygen transport in blood
Options- A. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal
- B. During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
- C. During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently
- D. Increased BPG levels in the red blood cells enhance oxygen-carrying capacity Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
- 4. What is the first thing that alcohol effects?
Options- A. Judgement
- B. Speech
- C. Vision
- D. Balance Also asked in: AIEEE, Analyst, Bank Clerk
Correct Answer: Judgement
Explanation:
Alcohol impairs your judgement. Judgement is in your brain stupid and it impairs your brain.
- 5. Which of the following statements is most accurate regarding infection with parvovirus B19?
Options- A. Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors
- B. Parvovirus B19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
- C. Parvovirus B19 can be diagnosed by detection of viral RNA using PCR or hybridization assays
- D. Parvovirus B19 replicates in the host cell nucleus utilizing a virally encoded DNA polymerase to create a double- stranded DNA intermediate Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors
Explanation:
Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors.
a. Parvovirus B19 binds preferentially to the erythrocyte blood group P antigen on erythroid precursor cells.
Answers B, C, D are incorrect:
b. after entry the single-stranded viral DNA genome is transported to the cell nucleus where the host DNA polymerase synthesizes the complimentary DNA strand.
c. Parvovirus B19 infection can be diagnosed by direct detection of viral DNA not RNA.
d. the fetus of a seropositive mother is protected from infection by maternal circulating antibodies.
- 6. Which of the following is present in a prokaryotic cell?
Options- A. Ribosomes
- B. Chloroplast
- C. Mitochondria
- D. None Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Ribosomes
Explanation:
Ribosomes are present in prokaryotic cells. These are organelles which consist of two subunits. They are present in both Eukaryotic and Prokaryotic cells. They are made up of RNA and proteins and present in the cytoplasm and on the membranes and are involved in protein synthesis.
- 7. In autotrophic bacteria, where is chlorophyll located?
Options- A. in the nucleoid
- B. in the infolded plasma membrane
- C. in the ribosomes
- D. in chloroplast membranes Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
Correct Answer: in the infolded plasma membrane
- 8. What molecule carries genetic information?
Options- A. RNA
- B. DNA
- C. Proteins
- D. Nucleotides Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: DNA
Explanation:
The nucleus of a cell contains chromosomes, which carry genetic information in a long molecule called DNA.
Genes are regions of DNA that carry the code to control a particular cell activity or the production of a particular protein.
- 9. In plants, chloroplasts are necessary for
Options- A. photosynthesis
- B. storage
- C. cell movement
- D. respiration Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: photosynthesis
Explanation:
Plants are producers, which means they make their own food. Chloroplasts are organelles found in eukaryotic and plant cells that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant.
Plants use energy from sunlight to help make their food, but they need chloroplasts to do it.
Hence, in plants, chloroplasts are necessary for Photosynthesis.
- 10. Which of these is NOT a lipid?
Options- A. Wax
- B. Cholesterol
- C. RNA
- D. Phospholipid Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: RNA
Explanation:
RNA is not a lipid among the given options.
A lipid is a substance of biological origin that is soluble in nonpolar solvents. It comprises a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, and phospholipids.
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