Steroid hormones are nonpolar molecules derived from cholesterol
a. True
b. False
ANSWER: True
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The first evidence for nucleosome formation came from digesting chromosomal DNA with a nonspecific nuclease. Gel electrophoresis of the DNA after the reaction revealed:
A. a ladder of protected fragments about 1,000 bp apart. B. a ladder of protected fragments about 200 bp apart. C. a large band corresponding to 200 bp. D. random distribution of bands corresponding to different sizes. E. four bands, each composed of a different histone.
Maternal messages in the form of mRNA is
distributed during
a. zygote formation. b. gastrulation. c. cleavage. d. neurulation. e. blastulation
Changes in the outcome of competition over an environmental gradient are mediated by multiple environmental variables
Indicate whether the statement is true or false
Thrush and vaginitis are caused by
A) herpesvirus. B) Chlamydia trachomatis. C) Candida albicans. D) Staphylococcus aureus. E) Streptococcus pyogenes.