Unit 2: Characteristics of Living Things

The pancreas is an organ that

• Makes estrogen

• Secretes insulin that raises blood sugar

• Secretes testosterone

• Secretes insulin that lowers blood sugar back to normal

Hormonal Feedback and Cellular Communication are carried about by which types of cells and molecules

• neurons, receptors and hormones

• receptors only

• red blood cells and hormones

• hormones only

Two biological processes that occur in nature that are mutually dependent on each other are

• active and passive transport

• photosynthesis and cellular respiration

• diffusion and osmosis

• nutrition and excretion

Fungi such as mushrooms and yeast are considered heterotrophs because they...

• are predators

• grow from the soil

• make their own food

• Consume food

Similar to animals, plants have specialized cells to maintain homeostasis. The cells depicted in the photo are....

• red blood cells

• white blood cells

• root cells

• guard cells

Guard cells close stomates in response to dry conditions to conserve water. This is an example of _________and is similar to _____________________________

• homeostasis, having a high temperature that changes the shape of an enzyme

• excretion, sweating on warm days

• feedback, kidneys decreasing urine production of hot days to avoid excess water loss.

• nutrition, decomposers recyling nutrients

Two factors that affect the way enzymes work are

• Temperature and pH

• Temperature and the amount of oxygen

• carbon dioxide and pH

• temperature and the amount of carbon dioxide

Autotrophs are different from heterotrophs in that they

• reduce global warming by recycling carbon dioxide

• produce carbon dioxide

• make ATP

• transferring energy from the sun into bonds within sugar molecules

The organelle found in plant cells that performs photosynthesis

• chloroplast

• mitochondria

• cell wall

• cell membrane

The organelle in the picture is the..

• mitochondria

• chloroplast

• ribosome

• cell membrane