unit 2 topic 5

Question 1

different cells are said to be what?

Answer 1

specialized for particular tasks.

Question 2

what are the characteristics of a nerve cell

Answer 2

have long branched fibers running from the main part of teh cell and are shaped to carry nerve signals from one part of the body to another.

Question 3

what are red blood cells

Answer 3

they carry oxygen in the bloodstream, have a thin, disk-like shape. this gives them a large surface area to pick up large amounts of oxygen

Question 4

what are the water-conducting cells

Answer 4

are tublike with thick walls and a network of holes that; lets water pass easily through them.

Question 5

what are the characteristics and the use of the onion skin cells

Answer 5

they are flat and brick shaped so they can fit closely together to form a continuous protective layer.

Question 6

what is one disadvantage of a unicellular organism

Answer 6

they cannot grow very large

Question 7

what is the advantage of a unicellular organism

Answer 7

can only live in water, food- rich surroundings.

Question 8

what are the four advantages of a multicellular organism compared to a unicellular

Answer 8

1. they can live in a variety of environments.
2. they are able to grow very large
3. can obtain their energy from a wide variety of foods.
4. can work more efficiently

Question 9

what are tissues

Answer 9

a group of cells having the same structure and function

Question 10

what are organs

Answer 10

groups of different tissues

Question 11

organs work together in what?

Answer 11

a system

Question 12

what is the definition of levels of organization in living things

Answer 12

the arrangments of cells tissues, organs and systems form several different levels of organization,