Explain how hydrogen bonding of water molecules is involved with movement of water in the xylem by cohesion-tension in transpiration pull and by adhesion to cellulose in cell walls
Questions and Answers
Explain that transpiration involves the evaporation of water from the internal surfaces of leaves followed by diffusion of water vapour to the atmosphere
Explain that transpiration involves the evaporation of water from the internal surfaces of leaves followed by diffusion of water vapour to the atmosphere
State that some mineral ions and organic compounds can be transported within plants dissolved in water
State that some mineral ions and organic compounds can be transported within plants dissolved in water
Explain mass flow in phloem sieve tubes down a hydrostatic pressure gradient from source to sink
Explain mass flow in phloem sieve tubes down a hydrostatic pressure gradient from source to sink
Describe the distribution of xylem and phloem in transverse sections of stems, roots and leaves of herbaceous dicotyledonous plants
Describe the distribution of xylem and phloem in transverse sections of stems, roots and leaves of herbaceous dicotyledonous plants
Relate the structure of xylem vessel elements, phloem sieve tube elements and companion cells to their functions
Relate the structure of xylem vessel elements, phloem sieve tube elements and companion cells to their functions
State that a polypeptide is coded for by a gene and that a gene is a sequence of nucleotides that forms part of a DNA molecule
State that a polypeptide is coded for by a gene and that a gene is a sequence of nucleotides that forms part of a DNA molecule
Explain that a gene mutation is a result of substitution or deletion or insertion of nucleotides in DNA and outline how each of these types of mutation may affect the polypeptide produced
Explain that a gene mutation is a result of substitution or deletion or insertion of nucleotides in DNA and outline how each of these types of mutation may affect the polypeptide produced
State that a gene mutation is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide
State that a gene mutation is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide
State that the strand of a DNA molecule that is used in transcription is called the transcribed or template strand and that the other strand is called the non-transcribed strand
State that the strand of a DNA molecule that is used in transcription is called the transcribed or template strand and that the other strand is called the non-transcribed strand