Double-ringed nitrogenous bases like adenine and guanine in DNA always bond with other double-ringed bases.

a. true
b. false


b. false

Biology & Microbiology

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Prostaglandins are

a. protein molecules that act either by paracrine or autocrine mechanisms. b. fatty acid derivatives that act either by paracrine or autocrine mechanisms. c. neurotransmitters that act by paracrine mechanisms. d. amine molecules that act by neuroendocrine mechanisms. e. steroid molecules that are lipid soluble.

Biology & Microbiology

The thin outer layer (1 to 2 mm thick) of each hemisphere of the brain that serves to increase the surface area by being arranged in a folded manner is called the ________

Fill in the blank(s) with correct word

Biology & Microbiology

The smooth endoplasmic reticulum

a. is the site where lipids destined for other cellular compartments are manufactured. b. produces the energy needed to run chemical reactions in the cell. c. converts sunlight into chemical energy. d. stores water, nutrients, and enzymes.

Biology & Microbiology

Actinomycetes ________.

A. do not form spores B. form asexual spores C. form sexual spores that are used for sexual reproduction D. form heat-resistant spores

Biology & Microbiology