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- Question
In a plant cell, DNA may be found in
Options- A. only in the nucleus and mitochondria.
- B. only in the nucleus and chloroplasts
- C. in the nucleus, mitochondria, and chloroplasts.
- D. only in the nucleus.
- Correct Answer
- in the nucleus, mitochondria, and chloroplasts.
ExplanationAll of the genetic information in a cell was initially thought to be confined to the DNA in the chromosomes of the cell nucleus.
It is now known that small circular chromosomes, called extranuclear, or cytoplasmic, DNA, are located in two types of organelles found in the cytoplasm of the cell.
These organelles are the mitochondria in animal and plant cells and the chloroplasts in plant cells.
Chloroplast DNA (cpDNA) contains genes that are involved with aspects of photosynthesis and with components of the special protein-synthesizing apparatus that is active within the organelle.
Mitochondrial DNA (mtDNA) contains some of the genes that participate in the conversion of the energy of chemical bonds into the energy currency of the cell?a chemical called adenosine triphosphate (ATP)?as well as genes for mitochondrial protein synthesis.
- 1. Which action is the best example of a direct observation?
Options- A. listening to a cricket chirp at night and counting the number of chirps per minute
- B. determining the seal population of an island by counting seals in 10 square meters of the island
- C. identifying which bird was present by the tracks that it leaves in the sand at a beach
- D. reading numbers on a heat sensor to conclude that there is a deer in the night woods Discuss
- 2. What is the main component of bones and teeth?
Options- A. Calcium Phosphate
- B. Calcium Carbonate
- C. Calcium Nitrate
- D. Calcium Sulphate Discuss
- 3. The longest period of prenatal development is the
Options- A. Germinal period
- B. Fetal period
- C. Embryonic period
- D. None Discuss
- 4. Plants synthesis protein from
Options- A. amino acids
- B. starch
- C. fatty acids
- D. sugar Discuss
- 5. Which of these provides your body with energy?
Options- A. Carbohydrates
- B. Fats
- C. Vitamins
- D. All the above Discuss
- 6. 3 functions of the nervous system? Discuss
- 7. What organelle is responsible for photosynthesis?
Options- A. mitochondria
- B. Cytoplasm
- C. Chloroplasts
- D. Ribosomes Discuss
- 8. Heat transfer horizontally within the atmosphere is called
Options- A. Convection
- B. Advection
- C. Conduction
- D. Absorption Discuss
- 9. Plants developing in dry conditions are
Options- A. lithophytes
- B. hydrophytes
- C. mesophytes
- D. xerophytes Discuss
- 10. While landing what type of tyres are used in an Aircraft?
Options- A. Water tubed
- B. Thick tubed
- C. Tubeless
- D. Thin tubed Discuss
General Science problems
Search Results
Correct Answer: listening to a cricket chirp at night and counting the number of chirps per minute
Correct Answer: Calcium Phosphate
Explanation:
The main component of bones and teeth is Calcium Phosphate.
Correct Answer: Fetal period
Explanation:
The third and longest period of prenatal development, extending from the ninth week until birth is Fetal period.
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week are known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
Correct Answer: amino acids
Explanation:
We know that, proteins are polymers of amino acids. So, plants are also used to synthesise protein from amino acids. Hence, plants synthesis protein from amino acids in the presence of ATP by specific synthetases.
Correct Answer: All the above
Explanation:
Nutrients are the substances in food that provide the raw materials and energy the body needs to carry out all its essential processes.
There are six groups of nutrients:
1. Carbohydrates.
2. Fats.
3. Proteins.
4. Vitamins.
5. Minerals.
6. Water.
Correct Answer: The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body In vertebrates it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS) The CNS consists of the brain and spinal cord The PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body The nervous system has three main functions: * To collect sensory input from the body and external environment * To process and interpret the sensory input * To respond appropriately to the sensory input
Correct Answer: Chloroplasts
Explanation:
Chloroplasts are organelles in plant and bacteria cells that contain the chlorophyll is responsible for photosynthesis.
Correct Answer: Advection
Correct Answer: xerophytes
Explanation:
Plants developing in dry conditions are called as xerophytes.
Correct Answer: Tubeless
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