Biology Concepts for Grade 12

What is the basic unit of life?

• Organism

• Tissue

• Atom

• Cell

Which organelle is known as the powerhouse of the cell?

• Ribosome

• Mitochondria

• Nucleus

• Chloroplast

What is the process by which plants make their own food?

• Digestion

• Photosynthesis

• Respiration

• Transpiration

Which molecule carries genetic information?

• Carbohydrates

• RNA

• DNA

• Proteins

What is the primary function of ribosomes?

• The primary function of ribosomes is to synthesize proteins.

• To store genetic information

• To transport nutrients within the cell

• To generate energy for cellular processes

What type of bond holds the two strands of DNA together?

• Ionic bonds

• Covalent bonds

• Peptide bonds

• Hydrogen bonds

Which phase of mitosis is characterized by the alignment of chromosomes at the cell's equator?

• Prophase

• Anaphase

• Telophase

• Metaphase

What is the role of enzymes in biological reactions?

• Enzymes slow down biological reactions by increasing activation energy.

• Enzymes speed up biological reactions by lowering activation energy.

• Enzymes are not involved in biological reactions at all.

• Enzymes convert energy into heat during reactions.

Which process involves the conversion of glucose into energy in the absence of oxygen?

• Photosynthesis

• Cellular respiration

• Glycolysis

• Fermentation

What is the main function of the cell membrane?

• To provide structural support to the cell

• To store genetic information

• The main function of the cell membrane is to control the movement of substances in and out of the cell.

• To facilitate energy production in the cell