Biology - Misc.

Question 1

Prokaryotes

Answer 1

ngle celled, lack a nucleus

Question 2

Eukaryotes

Answer 2

multicellular/single celled and contain a nucleus

Question 3

Characteristics of Life

Answer 3

• require food for energy
• respiration
• respond to external stimuli
• produce waste
• repair using cell division
• grow using cell division
• reproduce
• will die
• made up of chemicals (different metals OR carbon + hydrogen + nitrogen + oxygen)

Question 4

Cell Theory

Answer 4

1. All living things are made up of one or more cells and their products
2. The cell is the simplest unit that can carry out all life processes
3. All cells come from other cells, not from nonliving matter

Question 5

Sexual Reproduction

Answer 5

the process of producing offspring by the fusion of 2 gametes; the production of offspring that have genetic information from each parent

Question 6

Asexual Reproduction

Answer 6

the process of producing offspring from only one parent; the production of offspring that are genetically identical to the parent

Question 7

What do all organisms need to survive?

Answer 7

cell division + source of energy + nutrients + water + gases

Question 8

As multicellular organisms, why do number of cells increase instead of size?

Answer 8

Chemicals used during cell activity/growth enter across the membrane and travel through diffusion; where chemicals move from an area of higher concentration (amount of solute in a solution) to lower. Water enters and leaves in a process called osmosis whereas water moves in the direction of greater solute concentration. But when a cell gets too large, these necessary chemicals/water cannot move through the cell fast enough and will die!

Question 9

How does a minor cut heal over time?

Answer 9

Every day, your body sheds millions of dead skin cells, all of which are replaced by new ones. If you get a cut, cells divide to fill in the gaps.