Flashcards in EXAM 1 Deck (74)
Electronegativity is a measure of an atoms ability to attract a shared electron pair when it is participating in a covalent bond with another atom.
The production of a large molecule from smaller subunits is referred to as a catabolic reaction.
False; anabolic reaction
An enzyme is a biological carbohydrate-based catalyst.
Cells can control metabolic processes by restricting the location of enzymes and enzyme complexes within the cell.
Aerobic cellular respiration requires that oxygen be present.
Cellular respiration results in the relatively rapid, uncontrolled release of energy from a molecule of glucose to produce ATP for use by cells for various function.
False; relatively slow, controlled
Enzymes lower activation energy.
Ribosomes move along mRNA in a 5'-->3' direction.
Some restriction endonucleases make zigzag cuts in double-stranded DNA leaving blunt cells.
False; leaving sticky ends
Contractions that increase in strength during pregnancy are an example of a negative feedback mechanism.
False; positive feedback mechanisms
Kidney's remove waste, balance blood pH, and maintain water balance.
Wastes are filtered from the blood by the kidneys and conducted to the urinary bladder by the urethra.
A cross section of the kidney shows an oiter layer called the medulla, an inner layer called the cortex, and a hollow chamber called the renal pelvis.
False; outer layer called the cortex, inner layer called the medulla
When a person sweats and does not drink water, the pituitary gland releases ADH.
Insulin is produced in a healthy person when blood sugar is low.
False; blood sugar is high
People with diabetes feel tired because of low levels of glucose in the blood.
False; low levels of insulin
As follicles develop in the ovary, estrogen concentration in the blood decreases.
Information from your brain is moved to your leg muscles by motor neurons.
Myelin sheath is very important for the transferring of information along the medulla.
Electrochemical messages are carried by the movement of ions through the nerve membrane.
When the nerve cell is excited, it becomes more permeable to potassium ions than sodium ions.
False; sodium ions then potassium ions
Sharks, snakes, and crocodiles are able to grow new teeth all of their lives. This is considered to be an example of analogous structures.
Islands are very important places in which speciation occurs because the populations they contain are spatially isolated from other populations.
Over time, the total number of species in existance deos not change.
A species is a group of individuals that are reproductively compatible with each other but not with individuals from other groups.
The following structural formula is representative of which functional group?
An amino acid always has an amino group, as its name suggests. What other group is also present in all amino acids?
a carboxyl group
The hydrolysis (breakdown) of a dipeptide results in the production of which of the following?
Two amino acids
In aerobic respiration, which is a typical oxidation/reduction reaction, the energy...
Required for reduction is the same as that released in oxidation