Unit 12 Test Review

What disorder results when human body cells lose the ability to respond to internal regulatory signals that control cell growth?

Which of the following may result in cancer? I. Poor diet II. Chemicals in cigarettes III. Ultraviolet light IV. Tobacco use

Cells in a developing embryo respond to substances that stimulate them to go through the cell cycle without entering G0 in order to form many new cells quickly. These substances are produced from the instructions in oncogenes. Oncogenes are turned off as organisms mature.

Certain prokaryotes, such as E.coli, can alter its own metabolic activity. What allows it to do so?

Calico fur in cats is the result of different amounts of pigmentation in different areas of the skin. These cats are almost exclusively female since the gene for this coloring is located on the X-chromosome. Whether or not a cat shows orange-colored fur depends on that gene being turned on or off.What causes a cat to have calico fur?

Which of the following characteristics describes both bacteria and protists?

Some species of fungi, protists, and bacteria all play a vital role in every biogeochemical cycle. Which best identifies their common role?

Some Streptococcus bacteria can cause a disease called necrotizing fasciitis. Infection first produces mild redness on the skin. This leads to severe inflammation and blistering. Skin cells and underlying tissues then begin to die. People infected with this type of bacteria are most likely harmed when the bacteria –

The bacteria that cause diphtheria live in the mouth, nose, throat, or skin of an infected person. Without treatment these bacteria can damage heart muscle, leading to heart failure. The most likely way that bacteria living in the mouth, nose, throat, or skin can damage the heart is by –

Large numbers of helpful bacteria normally grow and reproduce in a person's intestine. Which of the following is one way that these bacteria promote health?

A student was studying microorganisms. She examined a sample in a sealed Petri dish, under a microscope, and created a drawing in her notebook. The student researched the microorganisms and learned the microorganisms reside in soil and on plant roots and undergo a process called nitrogen fixation which turns nitrogen from the atmosphere into compounds that are absorbed by plants.Which of these best describes the role of these microorganisms?