What polysaccharide forms the long, tough fibers found in plant cell walls?

A. chitin
B. cellulose
C. amylopectin
D. glycogen
E. starch


Answer: B

Biology & Microbiology

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The levels of all of the following hormones except for ______ are regulated by negative feedback

A. oxytocin B. parathyroid hormone C. follicle-stimulating hormone D. insulin E. thyroid hormone

Biology & Microbiology

Which of the following descriptions best fits viroids?

a. prokaryotic cells that live on or in animal cells b. a DNA or RNA genome with a protein coat c. a single-celled eukaryote classified with the fungi d. the smallest pathogens made of naked circular RNA

Biology & Microbiology

Which of the following conditions increases the risk of heat stroke?

a. all of the choices b. old age c. pregnancy d. diabetes

Biology & Microbiology

The first child conceived by in vitro

fertilization was born in: a. 1978. b. 1984. c. 1991. d. 2007. e. 2009

Biology & Microbiology