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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
Cell membranes are _____ _____ because they allow some substances to pass but not others.
Which of the following would be an example of an organic molecule?
CH4 (lower 4) carbon hydrogen four
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
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
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
the anatomical position is used
as a standard reference point for directional terms regardless of the actual position of the body
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.
the chemical notation, the symbol Ca+2(lower case two) means
a calcium ion that has lost two electrons
Which of the following consists of a network of intracellular membranes with attached ribosomes?
rough endoplasmic reticulum
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 ________ _________
the four elements that make up about 96% of body matter are
(cohn) carbon, oxygen, hydrogen, nitrogen
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