Which sequence correctly lists levels of organization from simple to more complex? 

A. Biosphere, ecosystem, community, population
B. Atoms, cell, molecules, tissue, organism
C. Organ system, organ, organisms, cell
D. Cell, tissue, organ, organ system


D. Cell, tissue, organ, organ system

Biology & Microbiology

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Which of the following events occurs first during meiosis? 

A. homologous chromosomes separate and are pulled to opposite poles of the cell B. sister chromatids separate and are pulled to opposite poles of the cell C. chromosomes decondense D. synapsis of homologous chromosomes E. pairs of homologous chromosomes align along the equatorial plate

Biology & Microbiology

Which number identifies a structure that is composed of polysaccharides?

a. 1 b. 3 c. 6 d. 7 e. 9

Biology & Microbiology

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

During prophase I, each chiasma represents:

a. the remnants of the nuclear envelope. b. the remnant of the nucleolus. c. a newly formed haploid gamete. d. a site of crossing-over. e. the site where sister chromatids are connected.

Biology & Microbiology