Which of the following statements best describes common variable immunodeficiency?
A. Symptoms appear in infancy.
B. It is inherited as an X-lmked recessive.
C. It is invariably fatal for the patient.
D. There is a deficiency of IgA, IgG, or both.
Ans: D. There is a deficiency of IgA, IgG, or both.
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The endocrine gland that is often called the master gland because of its influential role in regulating the other endocrine glands is the
A) thyroid B) pineal C) adrenal D) pituitary
The plant hormones ____ appear to regulate the expression of genes associated with a plant's growth responses to
light.
a. salicylic acid b. brassinosteroids c. gibberellins d. jasmonates e. oligosaccharins
The Protenor mode of sex determination is the ________
A) XO/YY scheme B) XX/XO scheme C) hermaphroditic scheme D) scheme based on F plasmids inserted into the FMR-1 gene E) scheme based on single translocations in the X chromosome
All of the following can be used to culture animal viruses EXCEPT
a) laboratory animals b) cell culture. c) embryonated eggs. d) glucose broth.