Students in a health class are studying the circulatory system. They learn that normal red blood cells transport oxygen in the bloodstream. A mutation in the DNA of a single gene in red blood cells changes the shape of the cells and the ability of the cells to transport oxygen, resulting
in a disorder called sickle cell anemia. One student claims that the red blood cells must be using a protein to carry oxygen.
Which two concepts can the student use as evidence for this claim?
A. Genes contain the code for making proteins.
O
B. DNA is made up of four types of nucleotide bases.
j
C. Oxygen is essential for cell metabolism in humans.
D. Red blood cells turn bright red in the presence of oxygen.
OE. A mutated protein may not be able to carry out normal function.

Which of the following is a cause of a dna mutation? o a. the linking of amino acid subunits into a long chain o b. the transcription of dna into rna o c. an error in the repair of damaged dna d. the diffusion of molecules across the cell membrane submit

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

He did not infringe upon the policy making powers that he felt the constitution gave congress. but the determination of foreign policy became preponderantly a presidential concern. when the french revolution led to a major war between france and england, washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-british. rather, he insisted upon a neutral course until the united states could grow stronger. which provides the best objective summary of this excerpt? president washington made a good choice when he decided not to accept the recommendations of his advisors and instead insisted that the united states stay neutral during the war between france and england as president, washington believed that the united states should remain neutral in foreign policy even though he had advisors who recommended that he take sides during the war between france and england. washington did not make policy decisions during his presidency because he did not want to interfere with the policy-making powers that the constitution gave congress. washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-britis