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- Question
Bacteria divide by
Options- A. Binary Fusion
- B. Cytokinesis
- C. Binary Fission
- D. Both B & C
- Correct Answer
- Binary Fission
ExplanationMost bacteria divide by binary fission, a form of cell division in which DNA replication and segregation occur simultaneously. This process involves active partitioning of the single bacterial chromosome and positioning of the site of septation.
Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells.
Binary fission begins when the DNA of the bacterium divides into two replicates. The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. Each daughter cell is a clone of the parent cell.
- 1. Movement of cell against concentration gradient is called
Options- A. active transport
- B. diffusion
- C. osmosis
- D. passive transport Discuss
- 2. What part of the body controls balance?
Options- A. Cerebrum
- B. Cerebellum
- C. Medulla oblangata
- D. Amygdala Discuss
- 3. 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
- 4. 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
- 5. Tissue that connects muscle to bone
Options- A. Tendons
- B. Joint capsule
- C. Body fiber
- D. Ligament Discuss
- 6. Basophils increase in number when parasitic invasion occurs.
Options- A. TRUE
- B. FALSE Discuss
- 7. What is the functional unit of a skeletal muscle called?
Options- A. Myofibril
- B. Sarcomere
- C. Fiber
- D. Fasciculus Discuss
- 8. Which of the following can be a symptom of AIDS?
Options- A. Hair loss
- B. Severe weight gain
- C. Tiredness
- D. All the above Discuss
- 9. What are the rungs of the DNA ladder made of?
Options- A. phosphates and sugars
- B. nitrates and sugars
- C. nitrates and phosphates
- D. sugars and hydrates Discuss
- 10. Most absorption of nutrients occurs in the
Options- A. Stomach
- B. Liver
- C. Large intestine
- D. Small intestine Discuss
Biology problems
Search Results
Correct Answer: active transport
Explanation:
The only transport method that can move species against their concentration gradient i.e, from low to high concentration is called Active transport.
Facilitated diffusion only moves species down their concentration gradient i.e, from high to low concentration.
Correct Answer: Cerebellum
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: 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: 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: FALSE
Explanation:
FALSE. Basophils number will not be increased when parasitic invasion occurs.
Basophils are a type of white blood cell. Although they're produced in the bone marrow, they're found in many tissues throughout your body. They're part of your immune system and play a role in its proper function.
Basophils appear in many specific kinds of inflammatory reactions, particularly those that cause allergic symptoms. If your basophil level is low, it may be due to a severe allergic reaction.
Basophils contain anticoagulant heparin, which prevents blood from clotting too quickly. They also contain the vasodilator histamine, which promotes blood flow to tissues.
Correct Answer: Sarcomere
Explanation:
The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, which are the basic functional units of the skeletal muscle.
Correct Answer: Tiredness
Explanation:
From the aboe given options, only extreme and unexplained tiredness is the symptom of AIDS.
The other symptoms of AIDS include: recurring fever, thrush ? a thick, whitish coating of the tongue or mouth that's caused by a yeast infection and sometimes accompanied by a sore throat, diarrhea that lasts more than a week, headaches, lightheadedness, and/or dizziness.
Correct Answer: nitrates and phosphates
Explanation:
The rungs or the sides of the DNA ladder is made of Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate.
Correct Answer: Small intestine
Explanation:
The small intestine is the main area of the GI tract for absorption.
The small intestine has three separate sections. Theyare :
1. The duodenum
2. Jejunum and
3. Ileum.
Hence, the majority of nutrient absorption occurs in the duodenum and jejunum of small intestine.
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