Antidiuretic hormone and oxytocin are products of
a. endocrine glands.
b. neurosecretory cells.
c. blood capillaries.
d. the anterior pituitary.
e. kidney and uterine wall cells, respectively.
B
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Environmental pressures result in a(n) ____ of adaptive alleles
a. decrease in the frequency b. increase in the frequency c. assortment d. removal e. migration
What is the underlying molecular cause of Crohn’s disease?
a. B cells are mutated and do not release antibodies. b. Receptor proteins are mutated and cause an abnormal immune response. c. Helper T cells are inactivated. d. Mucus is not released from epithelial tissues. e. Antigen-presenting cells are absent.
What happens to a dust particle that is too large to stay airborne and land in the alveoli?
A) It lands in the respiratory bronchiole, where it is coughed out. B) It lands in the mucociliary ladder, where it is moved to the trachea to be exhaled. C) It lands in the mucociliary ladder and moves to the pharynx to be swallowed. D) It lands in the bronchi, where it is absorbed. E) It lands in the mucociliary ladder, where type II macrophages phagocytize them.
Which of the following statements is false?
a. Fungi produce sexual spores b. Fungi produce asexual spores c. Fungal spores are used in identification d. Fungal spores are highly resistant resting spores