biology chpt 1.

The smallest level of organization with life-like characteristics is the

Cell

The smallest unit of biological structure that meets the functional requirements of "living" is the

Cell

A hypothesis is: A: a suggested explanation for an event. You got it wrong' B: testable through experimentation. C: falsifiable. D: all of the choices are correct.

D: all of the choices are correct.

In this experiment, 500 woman with pattern baldness are divided into two groups, group A and group B. Group A will receive a drug while group B will receive a placebo, which is a drug that does not affect baldness. Each week the number of hair per inch will be counted. What is the variable?

Drug

The presence of a membrane enclosed nucleus is a characteristic of

Eukaryotic

Using DNA to solve a crime falls into which scientific discipline?

Forensic Science

A decrease in blood water levels is detected in the brain. The brain sends signals to the pituitary gland to release hormones that communicate with the kidney to reabsorb water, which will increase blood water levels. This represents what life property?

Homeostasis

Receptors detect a rise in body temperature. The brain sends a signal to blood vessels to dilate and sweat glands to release more sweat which in turn will remove heat from the surface of the body until it cools down. What characteristic of life is described?

Homeostasis

A suggested and testable explanation for an event is called a

Hypothesis

Based on levels of organization, which example represents the broadest level?

Mississippi River

In this experiment, 500 woman with pattern baldness are divided into two groups, group A and group B. Group A will receive a drug while group B will receive a placebo, which is a drug that does not affect baldness. Each week the number of hair per inch will be counted. What is the control group?

Number of hair per square inch

Place the steps of the scientific method in order from beginning to end. 1) Form a hypothesis 2) Analyze the results 3) Perform the experiment 4) Form a conclusion 5) Make an observation 6) Support or reject the hypothesis

5, 1, 3, 2, 4, 6

Multiple independent experiments have demonstrated that cells are derived from other cells, all living organisms are composed of cells, and they are the basic unit of organisms. This statement is an example of:

A theory

Biology is the study of life. A. True B.False

A. True

What domain contains organisms that are prokaryotic? Select all that apply.

Archaea Bacteria

Which of the following shows structures in the proper order from smallest to largest? Molecules-atoms-tissues-cells-organs Molecules-atoms-cells-tissues-organs Option C: Cells-molecules-atoms-tissues-organs Option D: Cells-atoms-molecules-organs-tissues Option E: Atoms-molecules-cells-tissues-organs

Atoms-molecules-cells-tissues-organs

Sending electrical and chemical signals throughout the body to maintain the levels of glucose is what property of life?

Regulation

All living organisms share all of the following characteristics except:

The ability to harvest energy from the sun

Which is an example of a hypothesis that can explain the observation "This flashlight does not work."?

The batteries are dead.

There are _____ domains or lineages to life.

There are 3

Where in a phylogenetic tree would you expect to find the organism that has evolved most recently?

at the branch tips

What sequence increases in complexity for levels of biological organization?

atoms, molecule, cells, tissues, organs, systems

Woese's phylogenetic tree was constructed based upon:

comparative DNA sequencing.

An explanation accounting for observations is a(n)

hypothesis

Small structures that perform the functions within the cell are

organelles

Microscopic fossils from 3 million years ago would be researched primarily by a(n)

paleontologist.

Microbiology is a branch of biology that studies:

single-celled organisms

Read these statements and determine which is the hypothesis: 1) The student proposed that studying one hour a day would increase their grade. 2) The student wanted to pull up their grade. 3) A student scored a 55 on test 1 and realized that they were not as successful in their course. 4) The student scored an 84 on test 2 and decided that their new study methods were successful. A: statement 1 You got it right B: statement 2 C: statement 3 D: statement 4

statement 1