Nokea
What cellular appendage enables cells to move through their environments?
- A. Flagellum
- B. Cell membrane
- C. Transport protein
- D. Receptor
Correct Answer: A
Rationale: The flagellum is a whip-like appendage found in certain cells like sperm cells and some bacteria, enabling them to move through their environments. It plays a crucial role in locomotion by allowing cells to swim or propel themselves in liquids, aiding in their movement and navigation.
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Which genetic descriptor refers to an organism's actual appearance?
- A. Phenotype.
- B. Homozygote.
- C. Genotype
- D. Karyotype.
Correct Answer: A
Rationale:
What type of bond holds molecules of water together with other water molecules?
- A. Ionic
- B. Covalent
- C. Hydrogen
- D. Molecular
Correct Answer: C
Rationale: The correct answer is 'C: Hydrogen.' Molecules of water are held together by hydrogen bonds. These bonds form between the hydrogen atom of one water molecule and the oxygen atom of another water molecule. Hydrogen bonds are weaker than covalent bonds but are crucial in various biological processes, such as maintaining the unique properties of water and facilitating specific interactions in biological molecules.
What structure in a plant cell is surrounded by a double membrane and contains most of the genetic information used to control the cell?
- A. Mitochondrion
- B. Nucleus.
- C. Chromatin.
- D. Chromosome.
Correct Answer: B
Rationale: Rationale: The correct answer is B: Nucleus. The nucleus is surrounded by a double membrane and contains most of the genetic information in the form of DNA, which controls the cell's activities. Mitochondria (A) are involved in energy production, chromatin (C) is a complex of DNA and proteins within the nucleus, and chromosomes (D) are condensed structures of DNA found in the nucleus during cell division. Therefore, the nucleus is the structure that fits the description provided in the question.
What part of a plant cell acts as a barrier and provides support to the cell?
- A. cell membrane.
- B. Xylem.
- C. chloroplast
- D. Cell wall.
Correct Answer: D
Rationale:
What type of cell primarily makes up animals?
- A. Eukaryotic
- B. Simple
- C. Prokaryotic
- D. Bacterial
Correct Answer: A
Rationale: Animals are composed primarily of eukaryotic cells, characterized by a defined nucleus and membrane-bound organelles. Eukaryotic cells are complex and serve as the basis for multicellular organisms such as animals, contrasting with prokaryotic cells that lack a defined nucleus and organelles.