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- Question
Which organelle is the control center of a cell?
Options- A. Nucleus
- B. Cytoplasm
- C. Cell membrane
- D. endoplasmic reticulum
- Correct Answer
- Nucleus
ExplanationNucleus serves as the control center for cell metabolism and reproduction.
- 1. Which of these is a human disease caused by bacteria?
Options- A. TB
- B. Ascariasis
- C. Chickenpox
- D. Common cold Discuss
- 2. What happens during the S-phase of the cell cycle?
Options- A. cell division
- B. cell growth
- C. DNA replication
- D. protein and enzyme synthesis Discuss
- 3. Spiders belong to which class of animals?
Options- A. Arachnids
- B. Aves
- C. Gastropods
- D. Anthozoa Discuss
- 4. Some roots, called _________________, arise from an organ other than the radicle.
Options- A. tap roots
- B. stilt roots
- C. fibrous roots
- D. adventitious roots Discuss
- 5. Prawns belong to which family?
Options- A. Crustaceans
- B. Fish
- C. Amphibians
- D. Reptiles Discuss
- 6. Pressure, pain, and temperature receptors in the skin are
Options- A. Exteroceptors
- B. Proprioceptors
- C. Interoceptors
- D. Mechanoreceptors Discuss
- 7. 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 Discuss
- 8. What is the first thing that alcohol effects?
Options- A. Judgement
- B. Speech
- C. Vision
- D. Balance Discuss
- 9. 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 Discuss
- 10. Which of the following is present in a prokaryotic cell?
Options- A. Ribosomes
- B. Chloroplast
- C. Mitochondria
- D. None Discuss
Biology problems
Search Results
Correct Answer: TB
Explanation:
Bacteria which causes disease are called Pathogenic Bacteria. TB is caused by bacteria.
Some of the diseases caused by bacteria are::
1. Tuberculosis, TB (affects the lungs)
2. Salmonella (causes food poisoning)
3. Whooping cough (affects the lungs)
4. Septic Sore Throat
Correct Answer: DNA replication
Explanation:
S-phase (synthesis phase) is the part of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase. Precise and accurate DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease.
Correct Answer: Arachnids
Correct Answer: adventitious roots
Correct Answer: Crustaceans
Correct Answer: Exteroceptors
Correct Answer: During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
Correct Answer: Judgement
Explanation:
Alcohol impairs your judgement. Judgement is in your brain stupid and it impairs your brain.
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.
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.
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