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- Question
Biological catalysts are protein molecules which 1. speed up a chemical reaction 2. remain unchanged after reaction 3. function optimally at 37 deg C. 4. do not have an enzymatic activity Select the correct answer using the code given below.
Options- A. 1 only
- B. 1, 2 and 3
- C. 2 and 3 only
- D. 1, 3 and 4
- Correct Answer
- 1, 2 and 3
ExplanationEnzymes are biological catalysts. Enzymes are the catalysts involved in biological chemical reactions.
A fundamental task of proteins is to act as enzymes?catalysts that increase the rate of virtually all the chemical reactions within cells.
A catalyst remains chemically unchanged itself at the end of a reaction.
Each enzyme has a temperature that it works optimally in, which in humans is around 98.6 degrees Fahrenheit, 37 degrees Celsius ?the normal body temperature for humans.
- 1. Which of the following cells do not contain nucleus? 1. Root hair cells 2. Red blood cells 3. Platelets 4. Monocytes Select the correct answer using the code given below.
Options- A. 1 only
- B. 2 and 3 only
- C. 1, 2 and 4
- D. 2, 3 and 4 Discuss
- 2. Which one of the following hormones is essential for the uptake of glucose by cells in the human body?
Options- A. GH
- B. TSH
- C. Insulin
- D. Cortisol Discuss
- 3. Which part of the brain plays an important role in motor control?
Options- A. Cerebellum
- B. Cerebrum
- C. Medulla
- D. Pons Discuss
- 4. Eustachian Tube is located in which part of human body?
Options- A. Nose
- B. Ear
- C. Eyes
- D. Throat Discuss
- 5. Which of the following bacterium causes crown gall disease in plants?
Options- A. Bacillus thurigiensis
- B. Agrobacterium tumefaciens
- C. Pseudomonas fluorescens
- D. None of these Discuss
- 6. Synapse gap is present between which of the following?
Options- A. Two neurons
- B. Brain and Spinal Cord
- C. Two Kidneys
- D. None of these Discuss
- 7. Which one of the following functions is not carried out by smooth endoplasmic reticulum?
Options- A. Transport of materials
- B. Synthesis of lipid
- C. Synthesis of protein
- D. Synthesis of steroid hormone Discuss
- 8. Which one of the following tissues is responsible for increase of girth in the stem of a plant?
Options- A. Tracheid
- B. Pericycle
- C. Intercalary meristem
- D. Lateral meristem Discuss
- 9. Which one of the following organisms is dependent on saprophytic mode of nutrition?
Options- A. Agaricus
- B. Ulothrix
- C. Riccia
- D. Cladophora Discuss
- 10. Which one of the following has a bilateral symmetry in its body organization?
Options- A. Asterias
- B. Sea anemone
- C. Nereis
- D. Euchinus Discuss
Biology problems
Search Results
Correct Answer: 2 and 3 only
Explanation:
The absence of a nucleus is an adaptation of the red blood cell for its role. It allows the red bloodcell to contain more haemoglobin and, therefore, carry more oxygen moleculesLike red cells, platelets (thrombocytes) have no nucleus.Monocytes have a small spherical nucleus and has abundant dark staining condensed chromatin.There are 5 organelles found in a root hair cell. They are the: nucleus, cytoplasm, cell membrane, cell wall and vacuole.
Correct Answer: Insulin
Explanation:
Insulin is an anabolic hormone that stimulates glucose and fatty acid uptake into adipose cells, promoting triglyceride synthesis.Glucagon is a peptide hormone, produced by alpha cells of the pancreas. It works to raise the concentration of glucose and fatty acids in the bloodstream, and is considered to be the main catabolic hormone of the body.
Correct Answer: Cerebellum
Correct Answer: Ear
Correct Answer: Agrobacterium tumefaciens
Correct Answer: Two neurons
Correct Answer: Synthesis of protein
Explanation:
Smooth Endoplasmic Reticulumdoes not contain ribosomes on its surface for which it is regarded as smooth. So, proteins cannotbe synthesised by SER provided protein synthesis is the primary task of ribosomes.
Correct Answer: Lateral meristem
Explanation:
In vascular plants, the lateral meristem is one of two meristems in which growth occurs in order to increase stem girth. A meristem is the region of plant tissue found on the tips of roots and shoots. It is where cell division occurs to produce new growth.
Correct Answer: Agaricus
Explanation:
Saprophytic fungi feed on dead plant and animal remains. Many are extremely beneficial, breaking down this organic material into humus, minerals and nutrients that can be utilised by plants. Agaricus is one among them.
Correct Answer: Asterias
Explanation:
Asterias has bilateral symmetry only at larval stagebut fivefold symmetry (pentamerism, a special type of radial symmetry) as adults.
Nereis do not possess any symmetry elements in their body organisation.
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