Microscopic World - Grade Booster

An investigation was performed to determine the rate of growth of a bacterial population over a period of 16 hours. The data obtained is shown in the table. One probable explanation for the rate of growth after 8 hours is -

• A decrease in the amount of available food

• An increase in the rate of photosynthesis

• A decrease in the amount of waste products

• An increase in the rate of mitotic cell division

Choose all the correct answers. Look at the table. Which students observed a prokaryotic cell?

• Student 1

• Student 2

• Student 3

• Student 4

_____________ bacteria saves farmers millions of dollars every year in fertilizer costs?

• Anaerobic

• Pathogenic

• Nitrogen-fixing

• Endospores

Prokaryotes do not have a nucleus. Their genetic material is found in the nucleoid region. Which number represents the nucleoid region?

• 1

• 2

• 3

• 4

Which of the following structures would be used to identify a prokaryotic cell?

• Cell membrane, nucleus, and DNA

• Cell wall, flagella, and chlorplast

• Cytoplasm, smooth ER, and rough ER

• Cell membrane, ribosomes, and DNA

Select all correct answers. Which statements are true about viruses?

• Viruses cause many diseases

• Viruses are smaller than prokaryotes

• Viruses are made of living cells

• Viruses contain nucleic acid

• Viruses reproduce in the same way as other cells

The data below shows the effectiveness of the antibiotic on killing bacteria. What was the independent variable in this experiment?

• The amount of bacteria grown

• The type of antibiotics used

• The number of days incubated

• The type of nutrient agar used

Which of the following consists of prokaryotic cells?

• Plants and animals

• Bacteria and archaea

• Plants, fungi, bacteria, and archaea

• Plants, bacteria, and archaea

Directions: Click on the correct answers. The picture shows a virus and a bacteria cell. Which structures do they have in common?

• Capsid

• Protein Coat

• DNA

• RNA

• Tail

You discover a virus in the lab that infects humans and incorporates its genetic material into the host's genome. What type of virus was discovered?

• Bacteriophage

• Lytic virus

• Retrovirus

• Lysogenic virus