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Biological Science Major Quiz

Explore the wonders of life and level up your science teaching know-how. Part of our LET Reviewer 2026 practice series.

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1.How many carbon atoms does each pyruvic acid molecule contribute to the Krebs cycle?
2.How many oxygen molecules are required to completely oxidize one glucose molecule through aerobic respiration?
3.Which substance cannot be processed by glycolysis for catabolism?
4.Which characteristic is shared by both echinoderms and cnidarians?
5.Which characteristics are true of Phylum Chordata? I. Presence of notochord that provides skeletal support II. Pharyngeal slits that have become modified for gas exchange III. Dorsal hollow nerve cord that develops into the central nervous system
6.Which characteristic cannot be attributed to fungi?
7.Which biological process does not involve mitosis?
8.Which statements accurately describe mammals? I. They have four chambered heart II. They produce milk for the young III. They are warm blooded
9.What term describes the development of an egg into a new organism without fertilization by sperm?
10.Which structure is responsible for blood cell formation?
11.What is most likely to happen when a species fails to adapt to environmental changes?
12.What is the term for the release of a mature egg cell from the ovary?
13.Which blood cells are responsible for the clotting process?
14.Where does an ectopic pregnancy typically develop?
15.Why is the semi-permeable nature of cell membranes important?
16.Which evolutionary theory explains the disappearance of snakes' legs and the development of giraffes' long necks?
17.Which of the following are plant cell structures not found in animal cells?
18.Which gland functions as an exocrine gland?
19.Which organ is not considered an accessory organ of digestion?
20.Which hormone stimulates the development of male secondary sexual characteristics?
21.Which anatomical structure serves both reproductive and urinary functions in males?
22.Which organelle is primarily responsible for cellular respiration and ATP production?
23.What is the correct sequence of stages in complete metamorphosis in insects?
24.Which nitrogen base is found in RNA but not in DNA?
25.Which blood type is considered the universal donor?
26.What is the term for organisms that can produce their own food using light or chemical energy?
27.Which enzyme breaks down starch into simpler sugars in the mouth?
28.What type of joint allows the greatest range of motion in the human body?
29.Which plant hormone is responsible for phototropism and apical dominance?
30.What is the functional unit of the kidney responsible for filtering blood?

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