Which of the following statements is false concerning the outermost layer of the epidermis?
a. It is the first to experience any abrasion.
b. Keratin provides waterproofing.
c. Millions of cells are worn off daily.
d. Its cells are undergoing rapid cell division.
e. It is called the stratum corneum.
D
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In what general way are regulons regulated?
A) Regulons can be under both positive or negative control. B) Regulons are under negative control exclusively. C) Regulons are under positive control exclusively. D) Global regulation of regulons depends on the regulatory guidance of RNA polymerase II. E) Regulons are regulated by feedback translation loops.
Which genetic diseases involve defects in DNA repair that affect cell division?
a. Gaucher disease and Werner syndrome b. Kearns-Sayre syndrome and progeria c. progeria and Gaucher disease d. Gaucher disease and cystic fibrosis e. progeria and Werner syndrome
To establish itself in a host, a microbe must:
a. survive immune system defenses b. utilize a portal of entry c. be able to adhere to host tissue d. damage and destroy host tissue e. produce toxins and exoenzymes
Nitrogen-fixing bacteria convert ____ to ____, which is a form of nitrogen that plants can use.
A. nitrogen gas; ammonia B. ammonia; nitrogen gas C. nitrogen gas; nitrates D. nitrogen gas; nitrites E. ammonia; nitrates