Answer the following statements true (T) or false (F)
1.The pyloric sphincter lies between the small intestine and large intestine, thereby controlling the movement of food into the large intestine.
2.The lining of both the stomach and small intestine is protected from digestive enzymes by a mucus secretion.
3.Acid reflux, or "heartburn," is caused when the gastric juice moves back into the esophagus through the pyloric sphincter.
4.The trace mineral iron is necessary in humans for the transport of oxygen by hemoglobin molecules.
5.If the side effect of a drug was to disrupt homeostasis of vitamin C, leading to its premature breakdown and insufficient concentration, scurvy could result.
1.FALSE
2.TRUE
3.FALSE
4.TRUE
5.TRUE
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Which of the following statements regarding Campylobacter infection is incorrect?
A. It can lead to Guillain-Barre syndrome. B. It can cause acute temporary paralysis. C. Campylobacter burrows into the mucosa of the ileum and multiplies. D. It can last over 2 weeks. E. It is caused by a shiga toxin.
Which statement about sickle cell anemia is false?
A) Individuals who are heterozygous for the sickle cell allele cannot make hemoglobin. B) The sickle cell hemoglobin molecule contains an amino acid substitution. C) The hemoglobin molecules of an individual with sickle cell anemia clump together. D) The red blood cells of an individual with sickle cell anemia distort and elongate.
Which component of ATP synthase is the site of the proton channel?
A) F0. B) F1. C) F2. D) B subunit. E) G subunit.
At what point in meiosis do the homologous chromosomes separate from one another?
A) telophase I B) telophase II C) prophase II D) anaphase I E) metaphase I