All living things maintain a balance within their cells and enviroment through the process of

A. growth

B. development

C. homeostasis

D. evolution

Which exapmle of scientific methodology is incorrect?

A. Observation- A number of people in Zaire dying of a disease outbreak

B. Measurement- A record of the number of people with symptoms of the disease and the number of people who had died from the disease 

C. Analysis of data- Comparison of the effects of mixing monkey cells with virus-containing blood in test tubes and the effects of mixing of liquid from these test tubes with fresh monkey cells

D. Inference making- Identification of the Ebola virus as the cause of the disease by taking electron micrographs of sudstances found in the blood of persons affected with the disease

A hypothesis is

A. a definitie answer to a given problem

B. a testable possible explanation of an observation

C. a proven statement

D. a concluding statement

A light micoscope that has an objective lens of 10x and an ocular lens of 20x has a magnification of

A. 30x

B. 200x

C. 300x

D. 2000x 

Which 3 elements are often found in organic compandounds?

A. carbon, hydrogen, and oxygen

B. carbon, hydrogen, and neon

C. nitrogen, hydrogen, and oxygen

D. nitrogen, hydrogen, and phosphorus

All of the following are expamles of carbonhydrates except

A. sugar

B. cellouse

C. steroids

D. glycogen

All of the following are expamles of lipids except

A. saturated fat

B. starch

C. cholesterol

D. earwax

When the volume of a cell increases, its surface area

A. increases at the same rate

B. remains the same

C. increases at a faster rate

D. increases at a slower rate

Surface area is an important factor in limiting cell growth because

A. the cell can burst if the membrane becomes too large

B. materials cannot enter the cell if it is too large

C. the cell may become too large to take in enough food and to remove enough wastes

D. waste products cannot leave the cell if it is too small

A cell that can change its shape would be well suited for

A. receiving and transmitting nerve impluses

B. covering the body surface

C. moving to different tissues through narrow openings

D. all of the above

[image]

Refer to the illustration above. In eukaryotic cells, chromosomes are found in

A. structure "5"

B. structure "2"

C. structure "9"

D. structure "8"

How are chloroplasts like mitochondria?

A. They can both use energy grom sunlight.

B. They look alike.

C. They both manufacture food and release energy.

D. They are both found in animal cells.

Which of the following associations between a type of animal tissue and its primary function is incorrect?

A. connective tissue- transport of substances around the body

B. epithelial tissue- protective surface coverings

C. muscle tissue- contraction

D. nervous tissue- receiving and transmitting messages

Diffusion taskes place

A. only through a lipid bilayer membrane

B. from an area of low consentration to an area of high consentration

C. only in lipids

D. from an area of high consentration to an area of low consentration

Sugar molecules can enter cells through the process of

A. exocytosis

B. facilitated diffusion

C. osmosis

D. ion pumps

Which of the following is true of ions and their transport across cell membranes?

A. The "gates" for ion channels are always open.

B. Ions are very small and thus can cross cell membranes readily.

C. Electrical or chemical signals may control the movement of ions across cell membranes.

D. Because they are charged particles, the movement of ions across cell membranes requires energy input.

Which of the following does not expend energy?

A. diffusion

B. chemiosmosis

C. active transport

D. a sodium-potassium ion

Which of the following enters a cell by active transport?

A. glocose

B. water

C. sodium ion

D. potassium ion

The process by which water passes into or out of a cell is called

A. solubility

B. osmosis

C. selective transport

D. endocytosis

Ridding the cell of material by discharging it from sacs at the cell surface is called

A. chemiosmosis

B. exorcism

C. exocytosis

D. endocytosis