Steroid hormones are nonpolar molecules derived from cholesterol

a. True
b. False


ANSWER: True

Biology & Microbiology

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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.

Biology & Microbiology

Maternal messages in the form of mRNA is

distributed during

a. zygote formation. b. gastrulation. c. cleavage. d. neurulation. e. blastulation

Biology & Microbiology

Changes in the outcome of competition over an environmental gradient are mediated by multiple environmental variables

Indicate whether the statement is true or false

Biology & Microbiology

Thrush and vaginitis are caused by

A) herpesvirus. B) Chlamydia trachomatis. C) Candida albicans. D) Staphylococcus aureus. E) Streptococcus pyogenes.

Biology & Microbiology