Inhaling or "huffing" is a way to achieve a high, usually by breathing in a fat-soluble substance. Which of the following structures would be most likely attacked first?
A) myelin sheath
B) axon
C) neuron
D) dendrite
A
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Identify and briefly discuss two ecological roles filled by bacteria. What will be an ideal response?
Identify two different types of mating systems and list the advantages and disadvantages of each. What will be an ideal response?
A mother expresses the symptoms for Huntington's disease, an autosomal dominant trait. What are the chances that her offspring would carry a mutated allele if her partner is unaffected by the disease?
A. 0–25% B. 25–50% C. 50–100% D. 75% E. 100%
Answer the following questions true (T) or false (F)
1. In recombination (crossing over), DNA is exchanged between homologous, non-sister chromatids. 2. In humans, the sperm contributes the chromosome that determines whether the child will be a boy or a girl. 3. If an egg is fertilized by a sperm carrying an X chromosome, the resulting child might be either a boy or a girl, depending on the sex chromosome carried by the egg.