Consider a biochemical reaction A to B, which is catalyzed by A-B dehydrogenase. Which
enzyme 1 --> B --> enzyme 2 --> C.
A. Competitive inhibition
B. Irreversible inhibition
C. Feedback enhancement
D. Negative feedback
When lactose hydrolyzes its substrate, lactose, which of the following occurs?
A. Lactase retains it structure after the reaction.
B. Lactose retains its structure after the reaction.
C. Lactase increases the activation energy of the reaction.
D. Lactose decreases the activation energy of the reaction.
Discuss why competitive inhibition can be overcome with increasing substrate concentration but non-competitive inhibition cannot be overcome.
Why is negative feedback inhibition more common than positive feedback loops? Are there biological examples when positive feedback is necessary?
Compare and contrast the the concept of allosteric effectors with non-competitive inhibition.
Consider the pathway:
A --1-> B --2-> C --3-> D --4-> E
--5-> X --6-> Y
An increase in [E] leads to the inhibition of enzyme 3. All of the following are results of the process except:
A. an increase in [B].
B. an increase in [Y}.
C. decreased activity of enzyme 4.
D. increased activity of enzyme 6.
An infectious agent is probably a virus instead of a bacterium if it:
a) lacks membrane-bound organelles
b) cannot reproduce in acellular culture
c) has a length of 1?m, about the size of a mitochondrion
d) contains DNA
Which of the following is NOT true regarding lymphatic cells and their function(s)?
Please click on the correct answer:
A . Neutrophils are phagocytic cells.
B. Eosinophils secrete enzymes that fight against parasites.
C. Basophils secrete the antidiuretic hormone to aid in vasodilation.
D. B cells secrete antibodies.
A compound consists of approximately 72g carbon and 6g hydrogen. What is the empirical formula?
a) C6H6
b) CHO
c) CH
d) C6H12
Glen brings cookies to work. Although you have not yet tasted them, you say to another coworker, "Glen is such a great guy; I'm sure these cookies are fantastic!" What type of bias is this?
A. Reliance on central traits
B. Direct benefits
C. Halo effect
D. Similarity
Antidiuretic hormone (ADH) is a peptide hormone produced in the hypothalamus and released by the posterior pituitary gland in response to an increase in serum osmolarity. Diabetes insipidus is a disease characterized by a physical or functional lack of ADH and production of dilute urine. Given the symptoms of diabetes insipidus, one would expect ADH to act on:
A. Na/K/Cl channels in the loop of Henle.
B. NaCl channels in the distal convoluted tubule.
C. H2O channels in the distal convoluted tubule and collecting duct.
D. Na/H channels in the proximal tubule.
The photoelectric effect, caused when some photons and electrons collide, helps radiologists distinguish tissue types. An electron in a metal object is struck by a photon whose energy is exactly equal to the metal's work function. The electron will:
A. be ejected from the atom and will move faster than its previous velocity.
B. be ejected from the atom and move at its previous velocity.
C. be ejected from the atom and move slower than its previous velocity.
D. not be ejected from the atom, but will be accelerated to a greater velocity.
Which of the following is/are function(s) of NADPH in the cell?
I. Antimicrobial resistance via bacterial destruction by bleach within lysosomes.
II. Involvement in the production of the precursors to steroid hormones.
III. Functional carriage of energy across organelle membranes for use within the mitochondria
A. I only
B. I and II only
C. II and III only
D. I, II, and III
Studying why a nod means "yes" in many cultures is most representative of which of the following sociological concepts?
A. Demographic transition
B. Conflict theory
C. Symbolic interactionism
D. Demographic shift
Astronauts experience health conditions caused by living in a low-gravity (or zero-gravity) environment. Muscles atrophy and blood volume decreases. Satellite A is resting on the surface of the Earth, while satellite B is orbiting the Earth at an altitude of Re (equal to the radius of the Earth), directly over Satellite A. If B is twice as massive as A, what is the ratio of Earth's gravitational force on A to Earth's gravitational force on B?
A. 1/4
B. 1/2
C. 1
D. 2
Which of the following brain stem areas is most important in controlling breathing?
Please click on the correct answer:
A. Hippocampus
B. Limbic system
C. Cerebellum
D. Medulla
In the ZW sex-determination system for birds, males (ZZ) are the homogametic sex while females (ZW) are the heterogametic sex. What is the most likely regulatory mechanism for the potential imbalance in gene expression between male and female birds?
A) Post-transcriptional modification of half the male sex chromosomes gene products
B) Inactivation of one Z chromosome in males
C) Inactivation of the W chromosome in females
D) Destruction of one Z chromosome in males
Which of the following is TRUE regarding self-actualization as argued by a humanistic psychologist?
Please click on the correct answer:
A. Self-actualization is associated with peak experiences
B. Self-actualization is associated with extroversion
C. Self-actualization is innate
D. Self-actualization is a task confined to adolescence
By weight, the adult human body is approximately 65% water, though certain tissues may have more or less water. Several samples of water are taken: one from the product of a combustion reaction, one from solid ice, and a final sample in the liquid phase. Which of the following explains/describes why all three of these samples have the molecular formula H2O?
A. Constant composition
B. Empirical formula
C. Percent composition
D. Steady-state
Which of the following is TRUE regarding unfertilized oocytes in human females?
A. Unfertilized oocytes mature in the uterus
B. Unfertilized oocytes mature in response to an increase in FSH and LH
C. Unfertilized oocytes mature in response to an increase in gonadotropin releasing hormone (GnRH)
D. Unfertilized oocytes mature in response to an increase in estrogen
How many liters of .3M HCL can be made from a 2: stock solution of 1.5M HCL?
A. 10L
B. 12L
C. 6L
D. 20L
Hemolytic bacteria are those that are able to destroy red blood cells. A sample of blood is added to a plate of bacteria. After 48 hours, the extracellular concentration of mitochondria is observed to have increased. This finding is most consistent with which of the following statements?
A. The bacteria were hemolytic, destroying red blood cells during those 48 hours.
B. The bacteria were non-hemolytic, and some of them lysed during those 48 hours.
C. The plate contained more than one type of bacteria.
D. The plate contained more than one type of human cell.
In a closed system with constant temperature, pressure can be plotted against volume in a PV diagram. Given this, which of the following is NOT true?
A. The amount of energy expended by the system can be estimated by an area on the graph.
B. The relationship between pressure and volume would always be linearly decreasing.
C. The change in internal energy is equal to 0.
D. An appropriate example that can be plotted in this PV diagram is an ideal gas in a container (in a constant-temperature environment) which is allowed to expand slowly.-->
of the following statements is true?
A. The reaction will proceed until the enzyme concentration decreases.
B. The reaction will be more favorable at 0 degrees C.
C. A component of the enzyme transferred from A to B.
D. The free energy change (delta G) of the catalyzed reaction is the same as for the uncatalyzed reaction.
Which of the following statements about enzyme
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