Biology Checkpoint

This cell is undergoing mitosis.  What stage of mitosis is shown?

• prophase
• metaphase
• anaphase
• telophase

Tags

NGSS.HS-LS1-4

This diagram shows the cell cycle.

Which of the following activities occur in the S phase?

• Replication of the DNA
• Growth of the cell
• Formation of the mitotic spindle
• Breakdown of the nuclear membrane

Tags

NGSS.HS-LS1-1

• Prophase

• Anaphase

• Telophase

• Interphase

Tags

NGSS.HS-LS1-4

The picture shows a student using a microscope to study a prepared slide of a single-celled organism.A single-celled organism can be classified as a prokaryote based on the absence of —

• cell membrane

• ribosomes

• chromosomes

• nucleus

Which molecule synthesized by plants is a major source of energy for cellular processes in both plants and animals?

• Wax

• Nucleic Acid

• Glucose

• Cholorphyll

The picture shows a contractile vacuole of a unicellular freshwater organism. The contractile vacuole regulates the flow of water into and out of the cell in an aquatic environment.What conditions cause the contractile vacuole to fill with water?

• The concentration of water is greater outside the cell than inside the cell.

• The temperature of water in the vacuole is higher than the temperature of its environment.

• The concentration of water inside the cell is the same as the concentration outside the cell.

• The temperature of water in the vacuole is lower than the temperature of its environment.

Part of the cell cycle is shown in this simplified model.This part of the cell cycle is best described as the process that —

• duplicates the DNA

• completes cell division

• maintains genetic homeostasis

• synthesizes new molecules

The human immunodeficiency virus (HIV) often infects and destroys CD4 T cells. These CD4 T cells are one of many kinds of white blood cells that are an important part of the immune system.The most common danger related to the destruction of CD4 T cells is —

• an increase in the risk of high blood pressure

• an increase in the threat of diseases caused by microorganisms and viruses

• a decrease in the flow of blood to vital organs

• a decrease in the amount of oxygen being transported to tissues

People who have leukemia, a cancer that affects white blood cells, are often given Cytarabine. This drug inhibits the synthesis of DNA. Which phase of the cell cycle is most affected by Cytarabine?

• G1

• S

• G2

• M

Students were given a list of seven elements and asked to identify the four elements that are most abundant in biomolecules. Which table correctly identifies the four most-abundant elements in biomolecules?

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Tags

NGSS.HS-LS1-6