Practice Quiz Lecture Exam 1

Which Organ system supports the body and protects the internal organs?

The kidney and ureters are the organs of the _______ system.

The Maintenance of a relatively constant internal environment is an organism is termed

The type of feedback loop that increases or enhances the effects of the variable is:

What part of a feedback loop causes physiological responses to return the variable to the normal homeostatic range?

When you go outside on a hot summer day, your body temperature heats up above the normal range. Receptors in your brain detect the change in body temperature. The brain activates nerve cells that send messages to sweat glands, causing the body temperature to fall as the sweat evaporates from the skin. What part of this feedback loop is the stimulus?

An atom that has lost an electron is:

Na+ is best known as a(n):

In a water molecule, the electrons of 2 hydrogen atoms are shared equally with an oxygen atom, this reflects what specific type of chemical bond?

When energy released from the hydrolysis of ATP is used by the Na+/K+ pump to move ions against their respective concentration gradients, this is an example of a(n):

What type of reaction releases energy?

Hydrolysis of a polymer will produce:

Which has a greater concentration of hydrogen ions, a solution with a pH of 4 or a solution with a pH of 5?

What is the effect of a buffer on a solution?

A reaction in which amino acids are joined to form a dipeptide may be described as a(n):

Which of the following increases the rate of a reaction?

Water is most likely to dissolve a solute that is:

The monomer of nucleic acids are:

Which of the following is a polysaccharide found in large quantities in the liver and skeletal muscle?

Lipids:

The alpha-helix and beta-pleated sheet are characteristics of:

The opening of gated potassium (K+) channels in the plasma membrane of a cell would permit K+ to move down its concentration gradient:

Molecules with two fatty acid chains and phosphate group that form biological membranes are called:

What are the two steps of protein synthesis that produce a protein from a gene?

What is the role of RNA polymerase in transcription?

The stage of the cell cycle in which the cell grows and prepares for cell division is called:

Simple diffusion requires:

A substance moves by facilitated diffusion into a cell. What is required for its transport?

During osmosis, water moves across a selectively permeable membrane toward a solution with:

As a cell is placed into an unknown solution you make the observation that the cell is beginning to shrivel (lose water). The solution surrounding the cell may be described as:

Resting membrane potential is due to unequal concentrations of:

A white blood cell engulfs a bacterium through a process called:

Intracellular membrane-bound vesicle that contains digestive enzymes

Responsible for translation of mRNA

Includes microtubules and actin filaments; provides cell structure and permits cellular movement