Biology Lab

• Beef Broth : Covered
• Uncovered
• "does bacteria arise from pre-existing bacteria or are they generated spontaneously from broth?"

A formulation of a plausible explanation for the observation

watching and creating a hypothesis from what you see after stating the problem or question.

• conducting experiments
• testing your hypothesis

putting your observations into order

an educated response found by your experimentation and interpretation of the data you collected.

• used in fish aquariums
• observe:
• the cell wall
• chloroplasts
• cytoplasmic streaming

• Observe
• the box shaped cells

• Observe
• The potato cells are called starch grains

Both external and internal surfaces of multi celled animals are covered with this tissue

This tissue is able to contract thus moving parts of this organisms body

This tissue is repsonsible for sending messages that coordinate body functions

Individual cells have no structure, this tissued provides shape and support to the organism

the movement or traveling of a molecule from one place to another through either a gas solid or liquid

like a molecule of perfume travels through the air to the nose of a person across the room

like the molecules in a tea bag travel throughout a cup of hot water to make a a cup of tea.

like the coloring in a maraschino cherry "bleeds" into some jello or a juice stain travels into the fabric of a shirt.

The higher the temperature the faster the rate of diffusion

The bigger the size of the bolecule the slower the rate of diffusion

The smaller the size of the molecule the faster the rate of diffusion.

The diffusion of water.

Water moves from a higher concentration of water to a lower concentration of water.

The movement of one concentration of water to another concentration of water.

Water moves in osmosis from the higher concentration of water to a lower concentration of water

The higher the concentration gradient of water the faster the rate of osmosis

The replication of the nucleus of the cell with its chromosomes is called mitosis.

The dividing of a cell.

The life of a cell

plant tissue that replicates itself

making grass grow longer and trees grow taller.

• duplicated chromosomes become visible as they condense
• one of the two centrosomes moves to the side breaking the nuclear envelope

all of the chormosomes are aligned midway between the spindle poles

• Spindle microtubules separate the sister chromatids and move to opposite poles
• each sister has become and individual UNDUPLICATED chromosome

• The chromosomes reach the spindle poles and decondense
• a nuclear envelope forms

Nuclear division process that halves the chromosome number, basis of sexual reproduction

• homologous chromosomes condese
• pair up
• swap segments
• micortubules break up nuclear envelope

Homologous chromosomes are aligned mid way between spindle poles

• The homologous chromosomes separate
• begin to head to spindle poles

• Two clusters of chromosomes reach spindle poles
• A nuclear enevelope forms around each cluster

• The chromosomes condense
• sprindle microtubles attatch to sister chromatids
• breaks nuclear envelope

Chromosomes are aligned mideway between poles of spindle

• All sister chromatids are separate
• all duplicated chromosomes head to the spindles

• A cluster of chromosomes reaches each spindle pole
• A new nuclear envelope encloses each cluster.
• Four Nucleai are formed