Answer:
1. B, D and J.
2. A and C.
3. E, F, G, H, AND I.
Explanation:
A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature. A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.
A membrane is a thin layer which forms the wall of the cell and typically controls what leaves and enters the cell.
Some of the effects of various biological conditions on membrane physiology are;
1. Makes RMP (Resting Membrane Potential) Less Negative: this simply means that it decreases RMP;
- Decreased concentration of leaky potassium channels in the membrane.
- ATP stores are declining through mitochondrial poison (arsenic).
- Increased concentration of leaky sodium channels in the membrane.
2. Influences the Ability of the Cell to Repolarize;
- Voltage regulated potassium channels are blocked.
- Acetylcholine esterase concentration is decreased.
3. Influences the Ability of the Cell to Depolarize;
- The size of the synaptic cleft is increased.
- Hyperhydration (high water concentration in ECF).
- Release of excitatory neurotransmitter by a presynaptic input is blocked.
- Hyponatremia (low ECF sodium).
- Neurotransmitter synthesis is compromised due to Golgi dysfunction in the presynaptic neuron.
Answer:
Nitrifying bacteria carry out aerobic biological ammonia (NH3) oxidation to nitrate (NO3−) pls mark me branilest
Answer:
The correct options are:
a) The ability to halt the cell cycle in response to DNA damage.
c) The ability to repair DNA damage.
e) The ability to stimulate cell death processes if the cell is irreparably damaged.
Explanation:
p53 gene has been called 'the guardian of the genome' because its prevents genome mutations which can bear to tumor formation. The main roles of p53 are:
DNA repair (option c): it activates a ribonucleotide reductase which is involved in DNA repair when it is damaged.
Growth arrest (option a): it avoids the cycle cell progression when a damage occur.
Apoptosis (option e): it induces programmed cell death or apoptosis (because every cell must die eventually).
These processes are involved in prevention of tumor formation through activation/inhibition patways which in last instance prevent the replication of cells with a damaged/mutated genome.
Answer:
C
Explanation:
wax always melts in high temperatures
Fertile land is lost, and there is increased pollution and sedimentation in rivers and other aquatic areas.