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- Question
Which of these is NOT a lipid?
Options- A. Wax
- B. Cholesterol
- C. RNA
- D. Phospholipid
- Correct Answer
- RNA
ExplanationRNA 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.
- 1. In plants, chloroplasts are necessary for
Options- A. photosynthesis
- B. storage
- C. cell movement
- D. respiration Discuss
- 2. What molecule carries genetic information?
Options- A. RNA
- B. DNA
- C. Proteins
- D. Nucleotides Discuss
- 3. 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 Discuss
- 4. Which of the following is present in a prokaryotic cell?
Options- A. Ribosomes
- B. Chloroplast
- C. Mitochondria
- D. None Discuss
- 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 Discuss
- 6. A gland below the bladder and surrounding the urethra?
Options- A. Prostate
- B. Vas deferens
- C. Seminal vesicle
- D. Bulbourethral Discuss
- 7. Tissue that connects muscle to bone
Options- A. Tendons
- B. Joint capsule
- C. Body fiber
- D. Ligament Discuss
- 8. Which stage of cellular respiration produces the most ATP?
Options- A. Glycolysis
- B. Kreb's cycle
- C. Electron transport chain
- D. All the above Discuss
- 9. Amino acids can be distinguished from one another by
Options- A. type of bond between the R group and the rest of the molecule
- B. the number of R groups found on the amino acid molecules
- C. the chemical properties of their R groups
- D. the chemical properties of the amino and carboxyl groups Discuss
- 10. What part of the body controls balance?
Options- A. Cerebrum
- B. Cerebellum
- C. Medulla oblangata
- D. Amygdala Discuss
Biology problems
Search Results
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.
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.
Correct Answer: in the infolded plasma membrane
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.
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: Prostate
Explanation:
The prostate gland is a walnut-sized structure that is located below the urinary bladder in front of the rectum. The prostate gland contributes additional fluid to the ejaculate. Prostate fluids also help to nourish the sperm. The urethra, which carries the ejaculate to be expelled during orgasm, runs through the center of the prostate gland.
Correct Answer: Tendons
Explanation:
A tendon is a fibrous connective tissue which is Tough, fibrous, cord-like tissue that connects muscle to bone or another structure, such as an eyeball. Tendons help the bone or structure to move.
Correct Answer: Electron transport chain
Explanation:
There are 3 stages in cellular respiration. They are:
1. Glycolysis
2. Kreb's cycle
3. Electron transport chain
Here, Glycolysis produces only 2 ATP whereas Kreb's cycle produces no ATP. Electron transport chain of the cellular respiration produces the maximum ATP.
Correct Answer: the chemical properties of their R groups
Explanation:
Amino acids are organic compounds containing amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain (R group) specific to each amino acid.
Depending on the nature of the side chain groups, three classes of aminoacids can e distinguished:
1. Amino acids with H ond donor and acceptor groups.
Histidine, lysine, aspartic acid, threonine,...
2. Amino acids with donor grups only.
Arginine, tryptophan and cysteine.
3. Amino acids with acceptor groups only.
Asparagine and glutamine.
Correct Answer: Cerebellum
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