Praxis CKT Science Life Science Quiz

1. Which organelle is responsible for producing ATP through cellular respiration?

Mitochondrion

Ribosome

Golgi apparatus

Lysosome

2. What is the primary function of the ribosome?

Protein synthesis

DNA replication

Energy production

Waste storage

3. Which blood type has both A and B antigens but no Rh antigen?

AB positive

AB negative

A positive

B negative

4. Which process involves the conversion of light energy into chemical energy?

Photosynthesis

Fermentation

Glycolysis

Chemosynthesis

5. The DNA double helix is held together by bonds between which molecules?

Nitrogenous bases

Phosphate groups

Deoxyribose sugars

Hydrogen bonds between base pairs

6. Which of the following best describes natural selection?

Organisms change their traits during their lifetime

Organisms with advantageous traits reproduce more successfully

All organisms evolve at the same rate

Evolution only occurs in large populations

7. Which structure in plant cells is responsible for photosynthesis?

Mitochondrion

Chloroplast

Vacuole

Nucleus

8. The human circulatory system primarily transports which two substances?

Glucose and lipids

Oxygen and nutrients

Enzymes and hormones

Vitamins and minerals

9. Which hormone regulates blood glucose levels?

Glucagon

Insulin

Adrenaline

Thyroxine

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11. Which of the following is an example of a density-dependent limiting factor?

Hurricane

Disease

Drought

Volcanic eruption

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13. In humans, crossing over occurs during which stage of meiosis?

Prophase I

Metaphase I

Anaphase I

Telophase I

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16. During the Calvin cycle, carbon dioxide is fixed into which three-carbon compound?

Pyruvate

Acetyl-CoA

3-phosphoglycerate

Glucose

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19. In Mendelian genetics, if both parents are heterozygous for a trait, what percentage of offspring will be homozygous recessive?

25%

50%

75%

100%

20. In mitosis, sister chromatids separate during which phase?

Prophase

Metaphase

Anaphase

Telophase

Praxis CKT Science Life Science Quiz

1. Which organelle is responsible for producing ATP through cellular respiration?

2.

What first name or nickname would you like us to use?

2. What is the primary function of the ribosome?

3. Which blood type has both A and B antigens but no Rh antigen?

4. Which process involves the conversion of light energy into chemical energy?

5. The DNA double helix is held together by bonds between which molecules?

6. Which of the following best describes natural selection?

7. Which structure in plant cells is responsible for photosynthesis?

8. The human circulatory system primarily transports which two substances?

9. Which hormone regulates blood glucose levels?

10. The basic unit of life is the ____.

11. Which of the following is an example of a density-dependent limiting factor?

12. The ____ is the membrane that surrounds the cell and controls what enters and exits.

13. In humans, crossing over occurs during which stage of meiosis?

14. The process by which an organism's internal conditions are kept relatively stable is called ____.

15. Mutations that occur during DNA replication are most directly caused by ____.

16. During the Calvin cycle, carbon dioxide is fixed into which three-carbon compound?

17. The transfer of energy from one trophic level to the next is approximately ____ percent efficient.

18. In an ecosystem, organisms that produce their own food are classified as ____.

19. In Mendelian genetics, if both parents are heterozygous for a trait, what percentage of offspring will be homozygous recessive?

20. In mitosis, sister chromatids separate during which phase?