Biology Regents Review: Structure & Function

What is it called when a sperm and egg meet?

• meiosis
• fertilization
• cell division
• mitosis

1. What type of feedback is represented by the following example:

2. blood sugar increases → pancreas releases insulin → blood sugar decreases

• negative

• positive

When particles move from areas of high concentration to areas less concentrated, this has taken place.

• diffusion
• mitosis
• endocytosis
• photosynthesis

6. Which of the following represents the process of photosynthesis?

• C6H12O6+6O2→6CO2+6H2O

• 6CO2+6H2O→C6H12O6+6O2

• 2H2O→2H2+O2

• 2H2+O2→2H2O

______ are cells that are involved in sexual reproduction.

• B cells

• somatic cells

• gametes

• epithelial cells

When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed. This is an example of what type of feedback?

• Positive Feedback Response

• Negative Feedback Loop

Cells differentiate to perform different functions because

• all genes are turned on inside that cell

• all genes are turned off inside that cell

• different genes are turned on inside that cell

• different genes are turned on or off inside that cell

What is a STEM CELL?

• Cells found in the stems of plants.

• Cells that can differentiate into specialized cells.

• Cells that control your genes to be expressed.

• Cells that provide nutrients to your blood.

Genetic info flows in one direction. Which best represents this flow?

• DNA-protein-RNA
• Protein-RNA-DNA
• RNA-protein-DNA
• DNA-RNA-protein

Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation