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CH lower case 4 means

there is one carbon and four hydrogen atoms

A good example of positive feedback would be

enhancement of labor contractions

the innermost electron shell in an atom holds up to ______atoms


Atom X has seventeen protons. How many electrons in its valence shell?


Which of the following describes cells?

They are the structural building blocks of all plants and animals

Which of the following would be correctly classified as a protein?
Enzymes, liposaccharide, starch, cholesterol, cellulose


special catalytic molecules called ___ control chemical reactions in the body


______means toward or at the back of the body, behind


Cell membranes are _____ _____ because they allow some substances to pass but not others.

selectively permiable

______ is a broad term that covers all chemical reactions within the body cells.


AB------>A+B is an example of _______ reaction


Which of the following would be an example of an organic molecule?

CH4 (lower 4) carbon hydrogen four

A solution that has a pH of 2 could best be described as being


Some cells contain large numbers of mitochondria while others have relatively few or none. This suggests that

cells with large numbers of mitochondria have a high energy demand

The movement of oxygen from an area of high concentration to an area of low concentration is an example of


This type of feedback exaggerates the effects of variations from normal


If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what will happen

the cells will lose water and shrink

the chin is __ to the nose


which of the following statements is correct regarding the electrical charge of subatomic particles

protons are positively charged, electrons are negatively charged, and neutrons are neutral

when electrons are transferred from one atom to another the two atoms unite as a result of the opposite charges

an ionic bond is formed

a process that requires cellular energy to move a substance against its concentration gradient is called

active transport

An anatomical term that is the same as ventral


the anatomical position is used

as a standard reference point for directional terms regardless of the actual position of the body

The process of discharging particles from inside a cell to outside is called


the phrase____ _____ describes the plasma membrane consisting of phospholipids, proteins, and cholesterol that drift in a bilayer.

fluid mosaic model

____ are molecules with two fatty acid chains and a phosphate group that form biological membranes.


synthesis of lipids and glycogen takes place in the

smooth ER.

Isotopes of an element differ in the number of

neutrons in the nucleus

The plasma membrane is

The phospholipid bilayer surrounding the cell

The organic compounds that function in building tissues and acting as enzymes are the


The intake of small membrane vesicles from the extracellular fluid is called


Groups of cells that have a common funtion are called


the simplest atom-containing one proton, one electron, and no neurons is


the molecuel made by mitochondria that provides the power to the cell is


fatty acids are


which of the following is both an anion and a compound

HCO-3 (lower case 3)

What is the major function of ribosomes

manufacture proteins

which of the following elements of a control system detects a change?


The main, general purpose of negative feedback is

to maintain homeostasis


are both hydrophilic and hydrophobic in nature

the skin swells and puckers during a long bath this suggests that the bath water is a


the chemical notation, the symbol Ca+2(lower case two) means

a calcium ion that has lost two electrons

the anatomical position is characterized by all of the following except

palms turned posteriorly

a red blood cell placed in pure water would

swell and burst

Which of the following statements about RNA is true

RNA is single stranded

Which of the following consists of a network of intracellular membranes with attached ribosomes?

rough endoplasmic reticulum

All of the following are true concerning enzymes except that they

are consumed during the reaction

Starch is an example of a


Which of the following is a concept of the cell theory?

Cells are the basic structural unit of life

The movement of water across a membrane from an area of higher water concentration to an area of lower water concentration is known as


A solution that contains a higher solute concentration than the cytoplasm of a cell is called


A control mechanism that responds to a stimulus by decreasing its intensity is called a ________ _________

negative feedback

The random movement of molecules (and ions) down their concentration gradient is called


The body's ability to maintain stable internal conditions is referred as


The correct sequence from simplest to most complex

atoms, molecules, cells, tissues, organ

molecules that store and process genetic information are the

nucleic acids

the four elements that make up about 96% of body matter are

(cohn) carbon, oxygen, hydrogen, nitrogen

A person is lying on the bed gazing at the ceiling. She is in the _____ position


Many names for sugars end in the suffix


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