An individual with type A blood and an individual with type B blood mate and have offspring. What blood type is not possible in their offspring?
A. Type O blood
B. Type A blood
C. Type B blood
D. Type AB blood
E. All blood types are possible
E
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For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate
and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A) There is no radioactive isotope of nitrogen. B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C) Although there are more nitrogens in a nucleotide, labeled phosphates actually have sixteen extra neutrons; therefore, they are more radioactive. D) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
Trichomoniasis is a bacterial infection that is sexually transmitted; chronic infection often results in blindness, damage to the nervous system, and eventually death
Indicate whether the statement is true or false
Covers ends of bones at joints, supports the nose and airway passages.
What will be an ideal response?
When lungs evolved in vertebrates, the evolution of _____ also occurred in the circulation of blood within those vertebrates.
A. red blood cells B. a lymphatic system C. double circulation D. more plasma E. a muscular heart