Answer:
A, viruses can only infect a range of cells
“Spool-like” structures around which DNA is wrapped around 1.65 times
Answer:
Respiration is a process in which energy is released due to the breakdown of glucose molecules with the addition of oxygen forming carbondioxode, water and energy in the form of Adenine tri phosphate (ATP). This process also occurs in the absence of oxygen but then low amount of energy is generated. This process occurs in mitochondria of the cell. The energy which is produced during respiration is used by the cell in different processes and activities such as movement, exercise and thinking etc.
Answer:
A) purine
Explanation:
There are two ways for the synthesis of purines and pyrimidines:
- de novo synthesis-from basic simple units
- "recycling" synthesis-reuse of metabolites
Purines are synthesized directly on ribose sugar, in segments.
Pyrimidines are attached to the ribose after the synthesis of the base.
5-Phosphoribosyl-1-pyrophosphate (PRPP). is used for the synthesis of purine (ribose 5-phosphate reacts with ATP to form ribonucleotide).
Answer:
C .they are made of only protein
