Chapter 1 Homework

Certain blood vessels in humans constrict or dilate in during intense exercise.

Living things maintain homeostasis

Through years of exposure, many insects have become resistant to insecticides used in agriculture.

Populations of living things evolve

In a scientific experiment, a placebo is given to _______.

The control group

Which of the following does NOT describe a prediction

A vague, general statement ( a prediction is very specific)

Which one of the following is a TRUE statement?

All living things are made up of at least one cell.

In testing Drug A for its effectiveness in treating influenza, one group recieves the drug while the other recieves a placebo. All test subjects are females between the ages of 18 and 55. Which of the following factors would be the independent variable?

Drug- A received by only one group of subjects

Skin cells, like the bacteria living on human skin, give rise to new individual cells

Living things grow and reproduce

Chemical analysis of a plant indicates that it is primarily composed of carbon, hydrogen, nitrogen, oxygen, sulfur, and phosphorus; these elements are generally lacking in most rocks

Living things have a different molecular composition than nonliving things

All animals consume plants, animals, or other organisms in their environment

Living things require energy and raw materials

Many species of fish increase swimming activity when moving into colder waters

Living things respond to their external environment

Plants growing in flower beds around a house close leaf pores during the hot hours of the day

Living things respond to their external environment

Which one of the following taxa (subgroups used in classification) applies to humans?

Mammals

Because the natural world includes all energy and matter, it also includes all living organisms.

True

All of the following are features that collectively distinguish humans from other animals, EXCEPT __________.

ability to evolve as a species

Jenna has been telling her friends about how successful she was at losing 10 pounds by using a dietary supplement she purchased at a health food store. This is an example of __________.

anecdotal evidence

An acceptable scientific hypothesis ______.

can be tested and proven false

Which one of the following sequences is CORRECT in terms of level of organization from least to most complex?

cells, tissues, organs, organ systems, organism

Which one of the following sequences represents taxa arranged in order from largest, most all inclusive, to smallest?

domain, kingdom, phylum, class, order, family, genus, species

The process by which living organisms maintain a fairly constant internal environment despite changes in the external environment is known as

homeostasis

Which one of the following best describes the proper sequence of steps involved in the scientific method?

observe, state hypothesis,form a prediction, experiment, support or disprove hypothesis b a e c d