Which of the following statements is true concerning feedback mechanisms?
Negative feedback mechanisms work to prevent sudden severe changes within the body.
Homeostasis is the condition in which the body maintains
a relatively stable internal environment, within limits
Which of the following statements is the most correct regarding homeostatic imbalance?
It is considered the cause of most diseases.
One of the functional characteristics of life is irritability. This refers to ..
sensing changes in the environment and then reacting or responding to them
What is a vertical section through the body, dividing it into anterior and posterior regions called?
The change that a cell undergoes from an unspecialized one to a specialized one is called
A feedback system consists of three basic components: q control center, a receptor, and a..
The process of using energy to build p the body's structural and functional components is called
When your digestive enzymes chemically break down beef proteins into their subunits (amino acids), this would be an example of
If the number of a person's catabolic reactions are greater than his or her anabolic reactions , then this person is
The abdomino-pelvic cavity is divided into quadrants by horizontal and vertical lines passing through the
Which of the following is not true of proteins?
They appear to be the molecular carriers of the coded hereditary information
Carbohydrates and proteins are built up from their building blocks by the
removal of a water molecule between each two units
Which of the following statements is false?
Larger particles move faster than smaller ones and thus collide more frequently and more forcefully
Isotopes of the same element _____ in their atomic masses due to a _________ number of neutrons,.
Which protein types are capable of repairing other proteins that were damaged by stress or heat shock?
Amino Acids joining together to make a peptide is a good example of a(n) _________ reaction?
If the half- life of I-131 is 2 1\2 months, how much radioactivity remains in the thyroid of a patient five months after treatment with this radioisotope?
Which of these statements is true?
Alpha particles are much more massive than beta particles, and if inhaled,inflict much more damage.
High energy radiation damages biological tissues because it
ionizes many neutral atoms, resulting in free radical formation
If you skip a meal and you later feel a lack of energy, your liver will split stored glycogen into smaller molecules known as
Cell membranes must be both "hydrophobic and hydrophobic . which molecule can serve both of these requirements?
Hair and nails are structural proteins. What is a good example of a functional protein
Which statement is false?
Each enzyme can catalyze many different types of reactions
they are easily denatured at several degrees above the body temperature
They are catalysts that are made out of protein
A. each enzyme can catalyze many different type of reactions
The RNA responsible for bringing the amino acids to the factory site for protein formation is capable of reading both the nucleic acid and language as well as the protein language. That molecule is known as
If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what could happen?
the cells will lose water and shrink
Once solid material is phagocytized and taken into a vacuole, what best describes the events?
a lysosome combines with the vacuole and digests the enclosed solid material
Which of the following is a function of a plasma membrane protein?
molecular transport through the membrane
Passive membrane transport processes include
the movement of a substance down its concentration gradient
Which of the following is a principle of the fluid mosaic model of cell membrane structure?
Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.
The Na +/ K + pump functions to maintain a concentration gradient such that
potassium levels are high inside the cell and sodium levels are high outside the cell
A cell's membrane has been describe as a fluid mosaic meaning its like a mosaic of _____, in a sea of ____________.
Intravenous feeding is typically a 5% dextrose solution but this is a starvation diet, and patients will lose weight. Why don't they just administer a 10 % solution
it would result in a hypertonic extracelluler environment