Cellulose, chitin, and hyaluronan are all deposited extracellularly by

a. ABC transporters.
b. exocytosis.
c. secretion.
d. plasma membrane enzyme complexes.


Ans: d. plasma membrane enzyme complexes.

Biology & Microbiology

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For the most part, all Enterobacteriaceae are positive for which biochemical reactions?

a. Glucose, oxidase, and catalase b. Glucose, indole, and oxidase c. Glucose, reduce nitrates to nitrites, and oxidase d. Glucose, catalase, and reduce nitrates to nitrites

Biology & Microbiology

Which statement does NOT distinguish Darwin’s theory of natural selection from earlier descriptions of biological

diversity and adaptive traits?

a. Biological diversity has purely physical, rather than spiritual, origins. b. Evolutionary change occurs in groups of organisms, rather than in individuals. c. Spiritual explanations account for the origin but not the diversification of individuals. d. Some organisms function better than others in a particular environment. e. Evolution is a multistage process and natural selection eliminates unsuccessful variations.

Biology & Microbiology

DNA in the nucleus winds around proteins called

A) histones. B) karyosomes. C) ribosomes. D) proteasomes.

Biology & Microbiology

Genes that regulate development of specific body parts are called ________ genes

a. induction b. somite c. homeotic d. morphogen

Biology & Microbiology