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Venturi pressure effect (summation) - 🧠ANSWER ✔✔-(+) volume, (+)
pressure
-small diameter, small pressure (less summation effect)
-venturi bags used for COPD
-fluid pressure inverse of velocity
(p v=p v)
,*PV=nRT does not apply here since it's water NOT GAS. Since a pipe is an
enclosed system with water of equal density; pressure is deter by total
particles not density.
*NOT diffusion which is down a CONCENTRATION gradient. this is down a
pressure difference
Bernouli water effect (pooling) - 🧠ANSWER ✔✔(-) velocity, (+) pressure or
pooling
-at the narrowest part there's less pooling so has lowest pressure, but most
speed
*the water just want to zip through the narrowing as quickly as possible.
This aligns with Venturi effect since smaller diameter means less total
particles, less pressure restriction, faster get through
What causes duplex DNA with a certain (A + T):(G + C) ratio to melt at a
higher temperature than comparable length duplex DNA with a greater (A +
T):(G + C) ratio?
,A.
Stronger van der Waals forces of pyrimidines
B.
Stronger van der Waals forces of purines
C.
Increased π- stacking strength
D.
Reduced electrostatic repulsion of phosphates - 🧠ANSWER ✔✔C.
Increased π- stacking strength
less AT to GC means GC (denominator) is higher. G≡C is a triple H bond
with pi stacking strength
(H--->O, H--->N, O<--H)
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, *HO, HH, OH
Which property of a substance is best used to estimate its relative vapor
pressure?
A.
Melting point
B.
Boiling point
C.
Molecular weight
D.
Dipole moment - 🧠ANSWER ✔✔B.
Biology 2025 Expert Verified | Ace the
Test
Venturi pressure effect (summation) - 🧠ANSWER ✔✔-(+) volume, (+)
pressure
-small diameter, small pressure (less summation effect)
-venturi bags used for COPD
-fluid pressure inverse of velocity
(p v=p v)
,*PV=nRT does not apply here since it's water NOT GAS. Since a pipe is an
enclosed system with water of equal density; pressure is deter by total
particles not density.
*NOT diffusion which is down a CONCENTRATION gradient. this is down a
pressure difference
Bernouli water effect (pooling) - 🧠ANSWER ✔✔(-) velocity, (+) pressure or
pooling
-at the narrowest part there's less pooling so has lowest pressure, but most
speed
*the water just want to zip through the narrowing as quickly as possible.
This aligns with Venturi effect since smaller diameter means less total
particles, less pressure restriction, faster get through
What causes duplex DNA with a certain (A + T):(G + C) ratio to melt at a
higher temperature than comparable length duplex DNA with a greater (A +
T):(G + C) ratio?
,A.
Stronger van der Waals forces of pyrimidines
B.
Stronger van der Waals forces of purines
C.
Increased π- stacking strength
D.
Reduced electrostatic repulsion of phosphates - 🧠ANSWER ✔✔C.
Increased π- stacking strength
less AT to GC means GC (denominator) is higher. G≡C is a triple H bond
with pi stacking strength
(H--->O, H--->N, O<--H)
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, *HO, HH, OH
Which property of a substance is best used to estimate its relative vapor
pressure?
A.
Melting point
B.
Boiling point
C.
Molecular weight
D.
Dipole moment - 🧠ANSWER ✔✔B.
