Which of the following forms a protective layer outside of the plasma membrane of the plant cell?

A. cell wall
B. cellulose
C. chitin
D. pectin
E. proteoglycans


A. cell wall

Biology & Microbiology

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Bacteria ____

a. are diploid organisms b. produce gametes c. have a life cycle that varies between unicellular stage and multi-cellular stage d. have a single circular chromosome e. lack both DNA and RNA

Biology & Microbiology

Is most of our DNA made up of genes?

A) Yes, the vast majority of human DNA consists of genes. B) No, genes make up only 1.5% of our DNA.

Biology & Microbiology

When molecules move through a cell membrane from an area of greater concentration to an area of lesser concentration by way of a channel protein, it is called:

A. endocytosis B. exocytosis C. facilitated diffusion D. osmosis E. simple diffusion

Biology & Microbiology

Select the option that best finishes the following statement: "Evolution is a process __________."

(a) that can be understood based on the principles of mutation and selection. (b) that results from repeated cycles of adaptation over billions of years. (c) by which all present-day cells arose from 4–5 different ancestral cells. (d) that requires hundreds of thousands of years.

Biology & Microbiology