Bio 165: What is life

What is the basic unit of life?

Cells (composed of at least one or more cell)

What are the two basic cell types:

Unicellular (composed of one of more cell ie slalmonalla)

Multicellular (composed of more than one cell ie Plant)

How do organisms reproduce

autonomously (on their own) using DNA

What carries genetic information?

DNA (molecule)

DNA passes what down to the next generation?

Genetic information

What does DNA pass down?

Traits (such as eye color)

DNA codes for what?

proteins

What carries out the work that cells do?

proteins

What do organisms OBTAIN from the environment to support metabolism.

Energy > organism must obtain and use energy to support metabolism

What is energy used for

1) maintaining the organisms organization

2) carrying out chemical rxns

3) transporting molecules inside/among cells

4) reproducing, growing, developing

What do living things do to their environment

sense many aspects (plants grow towards the sun)

What does it mean for an organism to maintain a consistent interval environment (homeostasis)

to MAINTAIN a consistent internal condition despite external factors

To be considered alive what must all organisms do as a group?

they must EVOLVE > change the frequency (amount of) of specific trait over time

what is an example of evolution

over time antibiotics become less effective bc they are evolved against over time

Are viruses alive

1) they are not made up of cells (their genetic material is in a "case" their is not plasma membrane (which living things must have)

2) Cannot produce w/o help of host

3) can't obtain energy on own

4) can evolve

5) cannot respond to their environments

T.F. NO (must have all characterics to be alive

What are the characteristics of life?

1) ALL ORGANISMS CAN EVOLVE AS A GROUP

2) ALL ORGANISMS MAINTAIN ACONSISTENT INTERNAL ENVIRONMENT

3) ALL ORGANISMS SENSE THEENVIRONMENT AND RESPOND TO IT

4) ALL ORGANISMS OBTAIN ENERGY FROM THE ENVIRONMENT TO SUPPORT METABOLISM

5) ALL ORGANISMS REPRODUCE AUTONOMOUSLY USING DNA

6) ALL ORGANISMS ARE COMPOSED OFONE OR MORE CELLS