Cells that surround melanocytes may contain more melanin than the melanocytes because of the process of _____.
thinner in areas receiving greater friction and use
Which of these phrases does not characterize the dermis?
Persons who remain indoors frequently may have a higher risk of developing a malignant melanoma than those who are highly exposed to sunlight because of their work or other reasons.
Studies have shown that_____to high intensity sunlight, such as during some vacations, may cause cancer more likely than a constant level of daily exposure.
_____is a term which indicates a condition of hair loss or baldness and can occur on any part of the body.
_____can open directly onto the surface without association with hair follicles, such as in the genitals or lips.
_____occurs when the body is unable to eliminate excess body heat fast enough; it includes cramping and fatigue.
_____is a class of compounds that cause many reactions including the development of a fever, by stimulating the hypothalamus.
Cells in the deeper layers of the_____are cuboid. However the epithelium is classified as squamous because of the shape of the surface cells.
_____interferes with the synthesis of cell walls by bacteria and in this way blocks their reproduction.
The amino acids are transported to the place where they will be assembled into proteins by _____.
lower the energy of activation needed to start the reaction
Enzymes function in chemical reactions to ____________________.
phosphorylation of ADP to form ATP
Most of the readily-available energy stored in ATP is stored during the ________________.
energy from ATP is transferred to intermediates along the pathway to drive the reactions
The first several steps of glycolysis are considered the energy-investment steps because ______________.
Carbon dioxide and hydrogen atoms are released, and two molecules of ATP form.
What occurs during the citric acid cycle?
pH of 7.4
The following factors will decrease the function of most enzymes except which one?radiation,50 degrees C,pH of 7.9 or_____
are in the Kreb cycle
The following are true of NAD and FAD except which statement?are vitamin derivatives, contain nucleotides, transport hydrogen,_____
The first step in the utilization of amino acids for energy is ________ which occurs in the liver.
Enzymes are catalysts that alter chemical reaction rates by chemically combining with the substrate
The bond that is formed between the______and its substrate is actually physical and not chemical in nature; this must be true because the enzyme can be recovered unaltered after the reaction.
There are about 20 amino acids that are significant for humans but, only about eight (in adults) must be obtained directly from the diet since the liver is capable of synthesizing and converting other molecules into various amino acids.
There are about 20______that are significant for humans but, only about eight (in adults) must be obtained directly from the diet since the liver is capable of synthesizing and converting other molecules into various amino acids.
none of the above
Which of the following are limitations of DNA polymerase?it can only add bases to the exposed 5' end of a pre-existing strand, it can only replicate the leading strand, it can only replicate the lagging strand
the leading strand is replicated continuously, while the lagging strand is replicated discontinuously
Which of the following statements about DNA replication is TRUE?
DNA replication results in two identical daughter molecules each consisting of one old (original) strand and one newly-synthesized strand.
utilize the energy of the proton motive force to convert ADP to ATP.
The function of the enzyme ATP synthase is to...
Electrons enter the electron transport chain when NADH transfers them there along with protons in the form of hydrogen.
The electron transport chain consists of a series of membrane-bound carriers that shuttle protons and electrons to NADH.
E + S -> E-S -> E-P -> E + P
Which of the following correctly represents the mechanism of enzyme function?
2-carbon molecule to a 4-carbon molecule.
The initial reaction of the Krebs cycle involves the addition of a
the tRNA that was in the P site moves into the E site
Which of the following occurs as the ribosome shifts down the mRNA by a distance of three nucleotides?
The segment of the DNA molecule where messenger RNA synthesis begins is called the...
The complimentary messenger RNA strand that would be synthesized from the DNA base sequence of CTGAC would be...
) transcription terminator
The name of the structure that causes the synthesis of RNA to cease is called the...
An exocrine gland that loses small parts of its cell body during secretion, as is the case for the mammary gland, is further classified as a(n) ____________ gland.
transmitting nervous impulses
Neuroglial cells help neurons in each of these ways, with the exception of _______________.
One of the differences between cartilage and bone is that bone is a living tissue with a calcium matrix and a rich vascular supply.
The oviducts are lined with ciliated pseudostratified columnar epithelial cells which help propel the egg cells.