Biology Brain Teasers

1

100

I’m the brain of the cell, that’s where I stay, I hold the genes that guide the way.

Nucleus

200

Without me, you couldn’t breathe, I fill your lungs and then I leave.

Oxygen

300

I’m in your blood, red and round, I carry gas as I move around.

Red blood cell

400

I’m made of sugar, phosphate, and base, a spiral ladder that life can trace.

DNA

500

I’m the part of the plant that makes its food, I need the sun to change the mood.

Chloroplast

2

100

I’m like a skin but for each cell, I let things in or out as well.

Cell membrane

200

I’m the powerhouse, full of spark, I give your cells their energy mark.

Mitochondrion

300

I’m not alive, yet I can spread, I hijack cells and make you dread.

Virus

400

I absorb the water from your food, I’m in your gut — I set the mood.

Large intestine

500

I’m where water and minerals rise, from root to leaf, I climb and rise.

Xylem

3

100

I break down food with lots of might, I’m in your tummy day and night.

Stomach

200

I pump your blood and never rest, inside your chest I do my best.

Heart

300

I’m the green in every tree, I trap the sun for energy.

Chlorophyll or Chloroplast

400

I connect bone to bone with ease, I help your joints to bend and please.

Ligament

500

I move the sugar, up and down, I wear a plant-cell transport crown.

Phloem

4

100

I’m the code in every gene, passed from parents, mostly unseen.

Genetic information (or genes)

200

I pull in air and push it out, without me, you’d surely shout!

Lungs

300

I twist and turn and move around, muscles pull me, joint by joint I’m found.

Skeleton

400

I’m one cell splitting into two, a baby life begins with you.

Fertilized egg (zygote)

500

I’m the process of using light, to make food from air — what a sight!

Photosynthesis

5

100

I fight disease and keep you well, I’m part of your blood, as tests can tell.

White blood cell

200

I copy DNA just like a twin, I help divide cells from within.

Mitosis

300

I’m in your skin and sense what’s near, I let you touch, I help you hear.

Nerve

400

I let you grow, I let you change, I’m a chemical with powerful range.

Hormone

500

I keep your body nice and steady, temperature and balance always ready.

Homeostasis