Lab 7: UV Light, Melanoma, and Mitosis

What type of energy is sunlight energy?

electromagnetic energy

What particles make up light?

photons

Define wavelength

The distance between two parts of a wave

What type of wavelength can be detected by the human eye?

visble light

What is the relationship between wavelength and energy?

The shorter the wavelength the more energy it has

What are the three types of UV light?

UVA, UVB, UVC

What is the wavelenths, effects on human body, and ability to move through the ozone layer of the UVA?

wave length - 320 - 400 nm effects on human body - least harmfulability to move through the ozone layer - not absorbed

What is the wavelenths, effects on human body, and ability to move through the ozone layer of the UVB?

wave length - 290 - 300 nmeffects on human body - harmfulability to move through the ozone layer - 95% absorbed

What is the wavelenths, effects on human body, and ability to move through the ozone layer of the UVC?

wave length - 100 - 290effects on human body - strongest and most harmful ability to move through the ozone layer - completely absorbed

Name the two types of agents used in sunscreen

Physical and Chemical

Describe physical agents used in sunscreen

inorganic, do not contain carbon molecules, block and reflect the radiation coming from UV light.

Describe chemical agents used in sunscreen

organic, carbon containing, work to absorb UV radiation,

What does SPF stand for?

sun protection factor

How to calculate SPF required for an individual to prevent sunburn?

(minutes before burning) x (sun protection factor), then divide by 60 (minutes in hour)

What pigment is produced by skin to help prevent damage by UV light and is responsible for our "tans"?

Melanin

What types of cells produce this pigment?

Melanocyte

What type of skin cancer originated from the cells?

Melanoma

What are the two main phases of the cell cycle?

interphase and mitotic phase (M phase)

Be able to identify the following phases andstructures of the cell cycle on images of the onion root tip and plant cell model.

o Interphase

o Prophase

o Metaphase

o Anaphase

o Telophase

o Cytokinesis

o Nucleus

o Chromosomes

o Cell Plate

In image

Be able to identify thefollowing phases andstructures of the cell cycleon images of fish blastulaand animal cell models.

o Interphase

o Prophase

o Metaphase

o Anaphase

o Telophase

o Cytokinesis

o Nucleus

o Aster

o Spindle fibers

o Chromosomes

o Equator

In image

What is the difference between cytokinesis in animal and plant cells?

cell plate form in plant cells and cell membrane pinches inwards forming cleavage furrow in animal cells

Are all tumors cancerous? What is the difference?

No, benign tumors are non cancerous and malignant is cancerous

Name the two classes of cell cycle genes that can become mutated and lead to cancer development

oncogenes and tumor supressor genes

What is genetic predisposition?

a person's likelihood of developing a certain disease or condition depending on their genetic makeup.