Nokea
What structure allows sperm cells to move?
- A. Centriole.
- B. Centrosome.
- C. Flagellum.
- D. Cilium.
Correct Answer: C
Rationale:
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In the human life cycle, only sperm and eggs have which number of chromosomes?
- A. Diploid
- B. Polyploid
- C. Monoploid
- D. Haploid
Correct Answer: D
Rationale: In humans, sperm and egg cells are haploid, meaning they contain half the number of chromosomes (23) compared to diploid cells (46). This reduction in chromosome number is essential for sexual reproduction, allowing the formation of a diploid zygote upon fertilization. Haploid cells carry only one set of chromosomes, which is necessary for genetic diversity and the fusion of genetic material during fertilization.
Where does photosynthesis take place?
- A. Endoplasmic reticulum.
- B. Mitochondrion.
- C. Chloroplast.
- D. Golgi apparatus.
Correct Answer: C
Rationale: The correct answer is C: Chloroplast. Photosynthesis takes place in the chloroplast, specifically in the thylakoid membranes where the light-dependent reactions occur, and in the stroma where the light-independent reactions (Calvin cycle) take place. The chloroplast contains chlorophyll, the pigment responsible for capturing light energy needed for photosynthesis.
Explanation for why the other choices are incorrect:
A: Endoplasmic reticulum - The endoplasmic reticulum is involved in protein and lipid synthesis, not in photosynthesis.
B: Mitochondrion - Mitochondria are responsible for cellular respiration, not photosynthesis.
D: Golgi apparatus - The Golgi apparatus is involved in processing and packaging proteins for secretion, not in photosynthesis.
In summary, the correct answer is C (Chloroplast) because it is the organelle where photosynthesis occurs due to the presence of chlorophyll and the necessary enzymes for the light-dependent and
Which cell organelle can be functionally compared to a door of a house?
- A. Endoplasmic reticulum
- B. Cell membrane
- C. Nucleus
- D. Cytoplasm
Correct Answer: B
Rationale: The cell membrane can be likened to a door of a house because it functions to regulate what enters and exits the cell, maintaining internal balance (homeostasis) and safeguarding the cell's interior. Just as a door controls access to a house, the cell membrane controls the passage of substances into and out of the cell, thereby playing a crucial role in maintaining the cell's integrity and functionality.
What type of tissue is fat composed of?
- A. Connective
- B. Muscle
- C. Nervous
- D. Epithelial
Correct Answer: A
Rationale: The correct answer is A: Connective tissue. Fat tissue, also known as adipose tissue, is a type of connective tissue that stores energy in the form of fat. It provides insulation and serves as a reserve of energy. Muscle tissue (choice B) is responsible for movement, nervous tissue (choice C) transmits electrical signals throughout the body, and epithelial tissue (choice D) covers and protects body surfaces.
Which of the following nucleotides is not a component of DNA?
- A. Adenine
- B. Thymine
- C. Uracil
- D. Cytosine
Correct Answer: C
Rationale: The four nucleotides that make up DNA are Adenine, Thymine, Cytosine, and Guanine. Uracil is a nucleotide base that is present in RNA but not in DNA. Therefore, Uracil is the correct answer as it is not a component of DNA.