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
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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
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
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.
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,