Question 1

Which of the following best describes homeostasis in living organisms?

Accepted Answer

The process by which organisms maintain a stable internal environment despite changes in external conditions.

Question 2

A scientist wants to test the effect of temperature on enzyme activity. Which of the following is the best example of a controlled scientific experiment?

Accepted Answer

Measuring enzyme activity at different temperatures while keeping pH and substrate concentration constant.

Question 3

Which of the following is NOT one of the seven characteristics of life?

Accepted Answer

Ability to photosynthesize.

Question 4

In a negative feedback loop regulating blood glucose, which hormone is released when blood glucose levels rise above normal?

Accepted Answer

Insulin

Question 5

Which of the following best illustrates the division of labor in multicellular organisms?

Accepted Answer

Muscle cells contract to produce movement, while red blood cells transport oxygen.

Question 6

A student creates a graph showing the effect of exercise on heart rate. Which variable should be placed on the x-axis?

Accepted Answer

Time spent exercising

Question 7

Which of the following is an example of a positive feedback loop in the human body?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions.

Question 8

Which statement best explains why single-celled organisms like Paramecium can be used as models for communication in multicellular organisms?

Accepted Answer

They use chemical signals to respond to environmental changes, similar to cell signaling in multicellular organisms.

Question 9

Which of the following best describes the role of the hypothalamus in thermoregulation?

Accepted Answer

It detects changes in body temperature and initiates responses to maintain homeostasis.

Question 10

Which of the following is the correct order of levels of organization from simplest to most complex?

Accepted Answer

Cell → Tissue → Organ → Organ System → Organism

Question 11

A patient is experiencing hypoglycemia (low blood sugar). Which physiological response would help restore homeostasis?

Accepted Answer

Release of glucagon to increase blood glucose levels.

Question 12

Which of the following is a dependent variable in an experiment testing the effect of light intensity on plant growth?

Accepted Answer

Height of the plant measured after exposure to different light intensities.

Question 13

Which equation best represents the relationship between surface area and volume in cells, explaining why cells are small?

Accepted Answer

$$SA:V = \frac{6a^2$}{a^3$}$$ for a cube of side $$a$$

Question 14

Which of the following best describes the function of vasodilation in thermoregulation?

Accepted Answer

It increases blood flow to the skin, allowing heat to escape and lowering body temperature.

Question 15

Which of the following is an example of a claim supported by evidence and reasoning in a scientific investigation?

Accepted Answer

The data show that plants exposed to more light grew taller, supporting the claim that light intensity affects plant growth.

Question 16

Which of the following best explains why multicellular organisms evolved specialized cells?

Accepted Answer

Specialized cells allow for division of labor, increasing efficiency and survival.

Question 17

A scientist observes that when a person exercises, their breathing rate increases. Which process is this an example of?

Accepted Answer

Homeostasis responding to increased demand for oxygen.

Question 18

Which of the following is a correct application of the scientific method?

Accepted Answer

Formulating a hypothesis, designing a controlled experiment, collecting data, and drawing conclusions.

Question 19

Which of the following best describes the difference between a colony and a multicellular organism?

Accepted Answer

A colony consists of genetically identical cells living together, while a multicellular organism has specialized cells with different functions.

Question 20

During a fever, the body temperature rises above normal. Which feedback mechanism is responsible for returning the body to homeostasis?

Accepted Answer

Negative feedback loop involving sweating and vasodilation.

Unit 1 Study Guide: Homeostasis and Foundations of Biology

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