Examlex
What is the number of valence electrons in a molecule of ammonia?
Tracheids
Water-conducting cells in the xylem of vascular plants, characterized by tapered ends and thick, lignified walls.
Vacuole
A membrane-bound organelle within plant and fungal cells that is involved in storage and the regulation of cell volume and water balance.
Plant Cells
The basic structural and functional units of plants, characterized by a rigid cell wall, chloroplasts for photosynthesis, and a large central vacuole.
Elongate
To lengthen or stretch out, often referring to cells, body parts, or organisms.
Q7: Atoms of which two elements in the
Q15: For each of the following compounds,choose its
Q19: The second principal energy level contains s
Q48: The third principal energy level can hold
Q61: What is the percent by mass of
Q68: A 205 g sample of H<sub>2</sub>Se contains
Q75: In a system at equilibrium between the
Q83: At which temperature would NH<sub>3</sub> gas be
Q84: What is the [OH<sup>-1</sup>] in a 0.0001
Q90: The reaction: 2C + 3H<sub>2</sub>