Im not sure if this will be the answer you teacher is looking for but i think the answer would be
Hair on the head protects scalp from injury and sunlight
Eyelashes and eyebrows protect eyes
Nostril and ear hairs protect from foreign particles
1. Contraction
2. Actin
3. Tendons
4. Epidermis
5. Dermis
6. Acne
7. A nerve signal from the brain arrives at the intersection of the nerve and muscle cells and releases acetylcholine from the neuron. This triggers chemical changes in the muscle cell involving ions, including Ca2+. Calcium triggers the thick filaments, made of myosin, to attach to the thin filaments, made of actin, in the muscle cell, and the myosin pulls the actin toward the center of the muscle cell. ATP causes the release of the actin fibers, allowing the muscle to relax and the process to begin again.
For Penn Foster.
Full question attached
Answer/ Explanation:
The original DNA sequence has a point mutation changing a G to a T. The resulting mRNA produced is always complementary to the DNA from which it is synthesised, so the original mRNA sequence has a T, whereas the mutated mRNA has a U. The tRNA is complementary to the mRNA, so the original has a G, and the mutated has a T.
<h3>Original DNA</h3>
GTTGGCGAATGAACGGAGGCTGACGTCTAAGCCTAGAAAAATTGG
RNA
CAACCGCUUACUUGCCUCCGACUGCAGAUUCGGAUCUUUUUAACC
tRNA
GUUGGCGAAUGAACGGAGGCUGACGUCUAAGCCUAGAAAAAUUGG
<h3>_______________________________________________</h3><h3>Mutated DNA</h3>
GTTGGCGAATGAACTGAGGCTGACGTCTAAGCCTAGAAAAATTGG
RNA
CAACCGCUUACUUGUCUCCGACUGCAGAUUCGGAUCUUUUUAACC
tRNA
GUUGGCGAAUGAACTGAGGCUGACGUCUAAGCCUAGAAAAAUUGG
This is a point mutation called a substitution. This does not affect the entire sequence of the protein, because the mutation is "in frame" meaning the mRNA sequence is still read in the same way by the protein producing machinery. However, it does change the 5th codon from UGC to UGU. If we look up the genetic code, we can see that both of these codons code for cysteine, so there will be no change in the amino acid sequence of the protein
I believe it is the crust