Mammalian steroid hormones are signaling molecules that function in which of the following types of cell signaling?
A. juxtacrine
B. paracrine
C. autocrine
D. endocrine
E. All of these choices are correct.
D
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A non-aerated or shaken liquid growth medium inoculated with a bacterium is one of the best ways to culture an obligate anaerobe
Indicate whether the statement is true or false.
About ____ percent of children with Down syndrome are severely intellectually disabled
a. five b. ten c. twenty-five d. thirty e. forty
The chromosomes of most bacteria are comprised of ________.
A. double-stranded linear molecules B. single-stranded circular molecules C. double-stranded circular molecules D. single-stranded linear molecules
In contrast to alpha radiation, beta radiation:
A) is easily stopped by a piece of paper. B) travels slowly and is less penetrating. C) can easily penetrate the human body. D) requires a layer of clothing to stop it.