Question 1
Multiple ChoiceWhat is the basic structural and functional unit of all living things?
Explanation
The cell is the smallest unit that can carry out all life processes.
Question 2
Multiple ChoiceWhich organelle is known as the 'powerhouse of the cell'?
Explanation
Mitochondria produce ATP, the cell's main energy currency, through cellular respiration.
Question 3
Multiple ChoiceIn DNA, which base pairs with adenine (A)?
Explanation
A pairs with T (thymine); C pairs with G. This complementary base pairing lets DNA copy itself.
Question 4
Multiple ChoicePhotosynthesis primarily takes place in which part of a plant cell?
Explanation
Chloroplasts contain chlorophyll, the pigment that captures light energy.
Question 5
True FalsePhotosynthesis releases oxygen as a byproduct.
Explanation
Plants split water during photosynthesis, releasing O₂ into the air.
Question 6
True FalseHumans have four pairs of chromosomes in each body cell.
Explanation
Humans have 23 pairs (46 total), not four.
Question 7
Multiple SelectWhich of the following are producers in an ecosystem? (Select all that apply.)
Explanation
Producers make their own food via photosynthesis. Grass and algae do; rabbits and mushrooms do not.
Question 8
Multiple SelectWhich of these are nitrogenous bases found in DNA? (Select all that apply.)
Explanation
DNA uses adenine, thymine, cytosine, and guanine. Uracil replaces thymine in RNA, not DNA.
Question 9
Fill In Blank
The process by which plants convert light energy into chemical energy is called photosynthesis.
Explanation
Photosynthesis converts carbon dioxide and water into glucose and oxygen using sunlight.
Question 10
Fill In Blank
In cell division, mitosis produces two genetically identical daughter cells for growth and repair.
Explanation
Mitosis yields two identical diploid cells; meiosis yields four varied haploid gametes.