Biotech Chapter 1 Review

stubbornnessuglyBiotechnologie

12 déc. 2012 (il y a 9 années et 1 mois)

505 vue(s)

Chapter 1 Review

Essay

Some
scientists’

think that increased exposure to ultraviolet (UV) radiation is harming amphibian
populations. Write a hypothesis and a prediction stating that UV radiation is harmful to amphibians.
Hypothesis 1: excessive amounts of ultraviolet (UV) radiation can harm or

kill amphibian eggs.
Hypothesis 2: excessive amounts of UV radiation can make adult amphibians ill or cause them to die.
Prediction: exposing amphibian eggs and adult amphibians to high levels of UV radiation will harm or kill
amphibian eggs or adult amph
ibians.

Briefly describe recent scientific advances in treating an finding a cure for cancer. Scientists have
identified risk factors for many cancers and also have discovered that most cancers result from a
breakdown in the mechanism that controls cell di
vision. Scientists have developed drugs that stick to
and “gum up” cell proteins that mis
-
regulate cell division.

Explain why there is no absolute certainty or scientific “truth” in a theory. The possibility always remains
that future evidence will cause
a theory to be revised or rejected. A scientist’s acceptance of a theory is
always conditional.

How does the publication of research in a scientific journal benefit scientists? Scientists can use
information in an article in a scientific publication to de
velop or modify their own hypotheses. They can
also use the information to repeat the experiments and confirm the author’s results. Science journals
provide a means of communication for scientists all over the world.

Concepts to Consider

An organisms
metab
olism

is all of the chemical reactions that it carries out in order to run the processes
of life.

John Harte determined that snowmelt in the mountains of west
-
central Colorado released high levels of
diet
.

Diet, exposure to chemicals, and tobacco use can

all affect a person’s chances of developing
cancer
.

A possible cure for cystic fibrosis uses a technique called
gene

therapy
.

Parents produce offspring through
reproduction
.

All living things maintain a balance within their cells and the environment thr
ough the process of
homeostasis
.

The transfer of genetic traits from parent to offspring is known as
heredity
.

A(n)
cell

is the smallest unit capable of all life functions.

The development of vaccines that target two or more parts of a virus at the same
time is a method that
researchers hope will
halt the spread of AIDS.

The basic unit of heredity is a
gene
.

During a scientific investigation, a researcher generally forms a hypothesis and makes
predictions after
collecting observations.

To run the processe
s of life, all living things require
energy
.

A theory, in the scientific sense, is
a set of tested and confirmed related hypothesis.

Vocabulary Words

Hypothesis
: an educated guess based on what is already known

West Nile virus
: an emerging disease

Genetic

engineering
: a tool used to increase world food supply

Dependent variable
: variable that is measured in an experiment

Independent variable
: a factor that is changed in an experiment

Human Genome Project
: allowed scientists to read every human gene

Predict
ion
: the expected outcome of a test