The question provided is not complete as it lacks the group of choices, however the group of choices are given as follows:
A. A contraction fails to occur because an action potential is not generated in the muscle cell.
B. A contraction fails to occur because this toxin directly prevents ion release from intracellular stores.
C. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction.
D. A contraction fails to occur because this toxin prevents cross bridge formation and thereby directly prevents contraction.
E. C and D are both true
Answer:
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Explanation:
A muscle contraction takes place when action potential bring to muscles by nerves, which is traveled with the help of motor neuron and imitated the muscle contraction.
Acetylcholine or Ach is a chemical messenger to bring the nerve impulses between a nerve and a muscle. If the receptor is block with applying toxin muscle will not contract as ACh will not be able to propagate the nerve impulse to the muscle so there will be no action potential.
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Answer:
d. all of the offspring have medium length fur.
Explanation:
Incomplete dominance is a phenomenon in which offspring produce a trait that is intermediate between the two forms of a certain trait.
For example: In four o clock plant, some plants produce red flowers while some plants produce white flowers. When plants with red flowers are crossed with plants with white flowers, all the offspring have pink flowers.
Why is that so?
This is because no allele is completely dominant over the other and therefore both contribute their individual effect by producing intermediate phenotype.
Example in question:
Cross between a rabbit with short fur (SS) and a rabbit with long fur (LL)
P1: SS x LL
Gametes: S and L
Offspring SL :SL
SL: Medium length fur
Therefore this is a case of incomplete dominance.
Hope it help!
Weather patterns and soil conditions.
I believe the correct response is D. Need a living host cell to reproduce.
The variable that researchers manipulate is the independent variable.
The reason for this is because in experiments different manipulations are often introduced. The sole purpose of these manipulations is to see whether they will affect our independent variable and if they will change its value.
