Question

which molecule is the primary energy carrier in cells? *
a) dna
b) glucose (c₆h₁₂o₆)
c) atp
d) rna
which process describes water moving through a membrane without energy? *
a) osmosis
b) active transport
c) facilitated diffusion
d) exocytosis

Explanation:

First Question (Which molecule is the primary energy carrier in cells?)

• DNA (A) stores genetic info, not energy.
• Glucose (B) is an energy source, but ATP (adenosine triphosphate) directly transfers energy for cellular work.
• RNA (D) is involved in protein synthesis/genetic tasks, not primary energy carrier. So ATP is the primary energy - carrying molecule in cells.

Second Question (Which process describes water moving through a membrane without energy?)

• Osmosis is the passive (no energy) movement of water across a semi - permeable membrane down its concentration gradient.
• Active Transport (B) needs energy.
• Facilitated Diffusion (C) is for other molecules (e.g., ions, glucose) via proteins, not water's main membrane - crossing process here.
• Exocytosis (D) is for cell - to - outside transport of large substances, not water movement.

Answer:

C) ATP