Review Chapter 1

Biology is the _____.

• study of abiotic factors

• study of life

• study of chemicals and their properties

• study of the physical properties of the world

Answer explanation

Biology is defined as the study of life, encompassing all living organisms and their interactions. The other options focus on non-living factors or specific properties, making 'study of life' the correct choice.

After eating, the pancreas releases a hormone called insulin to help the cells take in the sugar from the food to keep the blood stream at the appropriate sugar level. This is an example of ...

• all living things containing DNA.

• all living things maintaining homeostasis.

• all living things evolving.

• all living things reproducing.

Answer explanation

This process of insulin release helps regulate blood sugar levels, illustrating how living organisms maintain homeostasis, or stable internal conditions, despite external changes.

Heliotropism is the seasonal motion of plant parts (flowers or leaves) to face their direction of the Sun. This is an example of ...

• all living things being made of cells.

• all living things maintaining homeostasis.

• all living things growing and developing.

• all living things responding to stimuli.

Answer explanation

Heliotropism demonstrates how plants respond to stimuli, specifically the direction of sunlight. This behavior is a clear example of living organisms adapting to their environment, confirming that all living things respond to stimuli.

At a doctor's appointment, a one month old baby weighs 8 lbs and is 18 inches long. That baby was 7 lbs and 17 inches long at birth. This is an example of ...

• all living things being made of cells.

• all living things maintaining homeostasis.

• all living things growing and developing.

• all living things responding to stimuli.

Answer explanation

This scenario illustrates the growth and development of the baby, as evidenced by the increase in weight from 7 lbs to 8 lbs and length from 17 inches to 18 inches. Thus, it exemplifies all living things growing and developing.

True or False: Living things must be multicellular.

• True

• False

Answer explanation

False is correct because living things can be unicellular, such as bacteria and protozoa. Multicellularity is a characteristic of some organisms, but not a requirement for all living things.

True or False: To be living, you must contain all 8 characteristics of life.

• True

• False

Answer explanation

True. To be classified as living, an organism must exhibit all 8 characteristics of life, including growth, reproduction, and response to stimuli. Missing any characteristic means it does not fully meet the criteria for life.

Something that was not alive, was never alive, and will never be alive is called ____.

• biotic

• dead

• living

• non-living

Answer explanation

The term 'non-living' refers to something that has never been alive and will not be alive in the future. In contrast, 'biotic' refers to living things, 'dead' refers to once-living things, and 'living' indicates current life.

When you step out into the cold, your body shivers in order to keep its temperature at 98.6F.

• All living things use energy

• All living things contain cells

• All living things maintain homeostasis

• All living things grow

Answer explanation

The body shivers to maintain its internal temperature, demonstrating homeostasis. This process is essential for all living things to regulate their internal environment despite external changes.

Living things are made up of units called

• DNA

• Cells

• Homeostasis

• Seeds

Answer explanation

Living things are composed of cells, which are the basic units of life. DNA is found within cells, but it is not a unit itself. Homeostasis refers to maintaining stable internal conditions, and seeds are reproductive structures, not units.

Living things are based on a universal genetic

code. What molecule is responsible for that code?

• RNA

• Lipid

• Protein

• DNA

Answer explanation

DNA is the molecule that carries the universal genetic code for all living things, encoding the instructions for development, functioning, and reproduction.