This polysaccharide is an important ECM component for the exoskeleton of many insects and shellfish.

A. proteoglycan
B. collagen
C. chitin
D. laminin
E. glycosaminoglycans


C. chitin

Biology & Microbiology

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In sea urchin embryogenesis, the mouth is formed ____

a. where the archenteron contacts the ectoderm b. by the blastopore c. by the blastocoel d. by migrating secondary mesenchyme cells e. where the blastopore contacts the ectoderm

Biology & Microbiology

Which of the following is a microbial product used to reduce crop damage?

A) Bt toxin B) saxitoxin C) ice-minus D) both Bt toxin and ice-minus E) both Bt toxin and saxitoxin

Biology & Microbiology

DNA microarrays reveal

A) if any genes are mutated in a given cell. B) if reverse transcriptase is present in a given cell. C) which genes are being expressed in a given cell. D) which genes are found in a given cell. E) if a particular gene was acquired via horizontal gene transfer.

Biology & Microbiology

DNA polymerase I

A. seals DNA gaps. B. adds bases to new DNA chain. C. removes primers. D. proofreads DNA chain. E. All of these choices are correct,

Biology & Microbiology