FLE2 Flashcards
if substance is excited by wavelength of 420nm, what wavelength of light will it emits?
wavelength greater than 420nm
what are the two rules of action/ reaction pair?
1) they must be the same type of force (gravitational, contact, electrical, etc.) and
2) they must act on DIFFERENT objects.
For most materials, the maximum static friction is:
larger than kinetic friction force
What is the empirical formula of the conjugate acid of the anion in strontium acetate, Sr(CH3COO)2?
CH2O
The longer the extended conjugated double bond system, the longer/shorter the wavelength of visible light that will be absorbed.
longer
If an inhibitor inhibits an enzyme AFTER it is bound, then the inhibitor is mixed or uncompetitive?
uncompetitive
What is changed in a mixed inhibitor?
binding of the inhibitor affects the rate of binding of the substrate, and vice versa.
where can ketone bodies such as acetoacetic acid be used as brain fuel?
brain, heart, muscles
is cytosine or guanine aromatic?
both
what is power when talking about an airplane’s speed forward?
P= force times velocity
Which concept best accounts for the pressure difference between upper and lower wing surfaces described in the passage?
Archimedes’ Principle, because the air is warmer above the wing than below it BArchimedes’ Principle, because the buoyant force is lower above the wing than below it CBernoulli effect, because the air is more dense above the wing than below it DBernoulli effect, because the air is moving faster above the wing than below it
D
Silkworms excrete a structural protein in which protein chains are organized and stabilized by which repetitive structural motif? Aα-Helices BDisulfide bonds Salt bridges Dβ-pleated sheets
D- silk = beta pleated sheets
Where X represents the conjugate base, which of the acids listed is expected to have the smallest H-X bond dissociation energy? A) Acid A, pKa = 4.10 B) Acid B, pKa = 4.75 C) Acid C, pKb = 9.63 D) Acid D, pKb = 10.90
D- pick lowest ska
The germ cells of a newly discovered diploid organism divide without the DNA replication step that normally occurs prior to meiosis. For this organism, which type of chromosome is found at the metaphase plate during Meiosis I?
a) Tetrads, consisting of two pairs of sister chromatids
B) Dyads, consisting of a single pair of sister chromatids
C) Monads, consisting of a single chromatid
D) Bivalents, consisting of four pairs of sister chromatids
C
Tight junctions are important in the BBB because:
A) they permit cell-to-cell communication between cells in the CNS and those in the PNS.
B) the adherens protein is overexpressed at the BBB to ensure tight associations between cells.
C) they create a chemical barrier that inhibits all active transport across the BBB membrane.
D) they seal off extracellular pathways, requiring passage through highly-selective cell membranes.
D
