[B] Phloem Cells Phloem fibers are thick-walled, long spindle-shaped dead cells with a narrow lumen. They provide mechanical support to the tissue. Phloem parenchyma is the thin-walled living cells of the parenchyma. They have two functions, as (i) storage and (ii) lateral food conduction.
[B] Phloem Cells
Phloem fibers are thick-walled, long spindle-shaped dead cells with a narrow lumen. They provide mechanical support to the tissue. Phloem parenchyma is the thin-walled living cells of the parenchyma. They have two functions, as (i) storage and (ii) lateral food conduction.
[B] Companion cells Tracheids and vessels are the xylem elements and are related to the transport of water. They are long tube-like structures with partially or completely breached walls to form water pipes (in vehicles) and pits in the cell wall (in tracheids) to conduct water. Sieve tubes are thinRead more
[B] Companion cells
Tracheids and vessels are the xylem elements and are related to the transport of water. They are long tube-like structures with partially or completely breached walls to form water pipes (in vehicles) and pits in the cell wall (in tracheids) to conduct water. Sieve tubes are thin tube-like structures whose end walls are perforated with many holes and are called sieve plates. They are phloem elements and are the main food carrier elements. Associate cells contain many mitochondria and ribosomes and are the supporting units of sieve tubes.
In the complete absence of expression of lac operon, permease will not be synthesised which is essential for transport of lactose from medium into the cells. And if lactose cannot be transported into the cell, then it cannot act as inducers hence, cannot relieve the lac operon from its repressed staRead more
In the complete absence of expression of lac operon, permease will not be synthesised which is essential for transport of lactose from medium into the cells. And if lactose cannot be transported into the cell, then it cannot act as inducers hence, cannot relieve the lac operon from its repressed state.
Some amino acids are coded by more than one codon (known as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained.
Some amino acids are coded by more than one codon (known as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained.
Which one of the following materials cannot be used to make a lens?
[D] Clay As clay is opaque. And hence, it does not let light to pass through it. So, your answer will be option [D].
[D] Clay
See lessAs clay is opaque. And hence, it does not let light to pass through it. So, your answer will be option [D].
The dead elements present in the phloem is
[B] Phloem Cells Phloem fibers are thick-walled, long spindle-shaped dead cells with a narrow lumen. They provide mechanical support to the tissue. Phloem parenchyma is the thin-walled living cells of the parenchyma. They have two functions, as (i) storage and (ii) lateral food conduction.
[B] Phloem Cells
See lessPhloem fibers are thick-walled, long spindle-shaped dead cells with a narrow lumen. They provide mechanical support to the tissue. Phloem parenchyma is the thin-walled living cells of the parenchyma. They have two functions, as (i) storage and (ii) lateral food conduction.
Which cell does not have perforated cell wall?
[B] Companion cells Tracheids and vessels are the xylem elements and are related to the transport of water. They are long tube-like structures with partially or completely breached walls to form water pipes (in vehicles) and pits in the cell wall (in tracheids) to conduct water. Sieve tubes are thinRead more
[B] Companion cells
See lessTracheids and vessels are the xylem elements and are related to the transport of water. They are long tube-like structures with partially or completely breached walls to form water pipes (in vehicles) and pits in the cell wall (in tracheids) to conduct water. Sieve tubes are thin tube-like structures whose end walls are perforated with many holes and are called sieve plates. They are phloem elements and are the main food carrier elements. Associate cells contain many mitochondria and ribosomes and are the supporting units of sieve tubes.
A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomena.
In the complete absence of expression of lac operon, permease will not be synthesised which is essential for transport of lactose from medium into the cells. And if lactose cannot be transported into the cell, then it cannot act as inducers hence, cannot relieve the lac operon from its repressed staRead more
In the complete absence of expression of lac operon, permease will not be synthesised which is essential for transport of lactose from medium into the cells. And if lactose cannot be transported into the cell, then it cannot act as inducers hence, cannot relieve the lac operon from its repressed state.
See lessThere is only one possible sequence of amino acids when deduced form a given nucleotides. But multiple nucleotide sequences can be deduced from a single amino acid sequence. Explain this phenomena.
Some amino acids are coded by more than one codon (known as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained.
Some amino acids are coded by more than one codon (known as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained.
See less