Praxis CKT Science Life Science Quiz

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

Glucose and lipids

Oxygen and nutrients

Enzymes and hormones

Vitamins and minerals

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

AB positive

AB negative

A positive

B negative

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

Prophase I

Metaphase I

Anaphase I

Telophase I

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

Hurricane

Disease

Drought

Volcanic eruption

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

Pyruvate

Acetyl-CoA

3-phosphoglycerate

Glucose

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10. Which hormone regulates blood glucose levels?

Glucagon

Insulin

Adrenaline

Thyroxine

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

Mitochondrion

Ribosome

Golgi apparatus

Lysosome

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

Mitochondrion

Chloroplast

Vacuole

Nucleus

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15. 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

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

Nitrogenous bases

Phosphate groups

Deoxyribose sugars

Hydrogen bonds between base pairs

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

Photosynthesis

Fermentation

Glycolysis

Chemosynthesis

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

25%

50%

75%

100%

19. What is the primary function of the ribosome?

Protein synthesis

DNA replication

Energy production

Waste storage

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

Prophase

Metaphase

Anaphase

Telophase

Praxis CKT Science Life Science Quiz

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

2.

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

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

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

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

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

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

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

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

9. The basic unit of life is the ____.

10. Which hormone regulates blood glucose levels?

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

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

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

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

15. Which of the following best describes natural selection?

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

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

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

19. What is the primary function of the ribosome?

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