unit 1

Question 1

what are the characteristics of living things

Answer 1

-consist of at least one cell
-grow and develop
-reproduce
-respond and adapt to environment
-obtain and use energy

Question 2

are viruses living

Answer 2

-no
-not made up of cells
-only capable of one life function
—> reproduce but only within another living cell

Question 3

what are the parts of a typical viral structure

Answer 3

-capsid: protein coat for protection
-core: either DNA or RNA
-receptor sites: spikes that help virus attach to its specific host cell

Question 4

define vaccine

Answer 4

a substance used to stimulate immunity to a particular virus

Question 5

how does a vaccine work

Answer 5

1) a weakened version of the virus is injected
2) body’s immune system practices destroying virus
3) if you are exposed to real virus the immune system can now destroy it quickly

Question 6

porifera

Answer 6

-multi-celled sea animals that stay attached to a rock of sea bottom (sessile)
-no real organs

Question 7

cnidaria

Answer 7

-radial symmetry

Question 8

platyhelminthes

Answer 8

tubes with flat bottoms

Question 9

nemotoda

Answer 9

-reproduces by laying eggs

Question 10

annelida

Answer 10

-cylinder divided into ringed sections

Question 11

mollusca

Answer 11

soft bodied animals with a shell

Question 12

echinodermata

Answer 12

organs are arranged around the center of the animal like spokes around a wheel

Question 13

arthropoda

Answer 13

-contains different sections that are connected by joints
-exoskeleton

Question 14

chordata

Answer 14

-has a back bone and spinal cord
-endoskeleton