Nokea
Which statement accurately describes cytokinesis in animal cells?
- A. Which statement accurately describes cytokinesis in animal cells?
- B. A cell plate forms in the center of the dividing cell, eventually separating the cytoplasm into two daughter cells.
- C. A cell plate forms in the center of the dividing cell, eventually separating the cytoplasm into two daughter cells.
- D. The nucleus elongates and pulls apart, physically dividing the cytoplasm into two.
Correct Answer: B
Rationale: A) This statement is a duplicate of option C and does not accurately describe cytokinesis in animal cells.
B) In animal cells, during cytokinesis, a cleavage furrow forms in the center of the dividing cell. This furrow deepens and eventually pinches the cytoplasm into two daughter cells. This process is distinct from plant cells, where a cell plate forms.
C) This statement is a duplicate of option A and does not accurately describe cytokinesis in animal cells.
D) This statement describes the process of nuclear division (mitosis) rather than cytokinesis, which is the division of the cytoplasm.
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Identify the INCORRECT function of the liver.
- A. Bile production to aid digestion.
- B. Synthesis of blood proteins, such as albumin.
- C. Storage of glucose for energy regulation.
- D. Filtration of waste products from the blood.
Correct Answer: D
Rationale: A) Correct - The liver produces bile, which aids in the digestion and absorption of fats in the small intestine.
B) Correct - The liver is responsible for synthesizing blood proteins, including albumin, which helps maintain osmotic pressure in the blood.
C) Correct - The liver stores glucose in the form of glycogen and helps regulate blood sugar levels by releasing glucose when needed.
D) Incorrect - The liver does not filter waste products from the blood. Instead, the kidneys are responsible for filtering waste products from the blood and excreting them in the form of urine.
What is the process by which a large, unstable nucleus splits into two smaller nuclei, releasing neutrons and energy?
- A. Alpha decay
- B. Beta decay
- C. Gamma decay
- D. Nuclear fission
Correct Answer: D
Rationale: Nuclear fission is the correct answer. It is the process in which a large, unstable nucleus splits into two smaller nuclei, releasing neutrons and energy. Alpha decay, beta decay, and gamma decay involve the emission of alpha particles, beta particles, and gamma rays, respectively. These decay processes do not result in the splitting of a nucleus like nuclear fission does.
Adipose tissue, commonly known as fat, primarily functions in:
- A. Support
- B. Insulation
- C. Energy storage
- D. All of the above
Correct Answer: D
Rationale: Adipose tissue, also known as fat, serves multiple essential functions in the body. It provides support by cushioning and protecting organs, acts as an insulator to help regulate body temperature, and serves as a major energy storage site by storing excess energy in the form of triglycerides. Therefore, all the options (support, insulation, and energy storage) are correct functions of adipose tissue, making 'All of the above' the correct answer. Choices A, B, and C are all individually valid functions of adipose tissue, but to encompass the comprehensive role of adipose tissue, 'All of the above' is the most accurate option.
Which muscular chamber of the heart receives blood from the body and pumps it to the lungs?
- A. Right atrium
- B. Left atrium
- C. Right ventricle
- D. Left ventricle
Correct Answer: A
Rationale: The correct answer is the right atrium. The right atrium receives deoxygenated blood from the body through the superior and inferior vena cava. It then pumps this deoxygenated blood to the lungs via the pulmonary artery for oxygenation. The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle. The right ventricle receives oxygen-poor blood from the right atrium and pumps it to the lungs. The left ventricle receives oxygenated blood from the left atrium and pumps it to the rest of the body.
Identify the spectator ions in the reaction: 2KCl + Pb(NO3)2 → 2KNO3 + PbCl2.
- A. K+ and NO3-
- B. K+ and Cl-
- C. Pb2+ and NO3-
- D. Pb2+ and Cl-
Correct Answer: B
Rationale: - In the reaction, potassium ions (K+) and chloride ions (Cl-) are present on both sides of the equation. They are not involved in the formation of the products and remain unchanged.
- Lead ions (Pb2+) and nitrate ions (NO3-) are involved in the formation of the products potassium nitrate (KNO3) and lead(II) chloride (PbCl2).
- Therefore, the spectator ions in this reaction are K+ and Cl-.