Proteins that span the membrane multiple times have multiple _______ that alternate with multiple transmembrane stop-transfer sequences.
a. glycosylation sites
b. internal signal sequences
c. phosphorylation sites
d. sulfation sites
Ans: b. internal signal sequences
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What part does carbon play in the structure of
biological molecules?
a. carbon forms their backbone b. carbon provides polarity c. carbon makes it easier for them to be digested d. carbon forms a bridge between two monomers e. carbon plays no role whatsoever in the structure of biological molecules
Which RNA acts as an enzyme?
a. mRNA b. rRNA c. tRNA d. mRNA and rRNA e. rRNA and tRNA
Why is the preservation of ancestor species, such as Mexican teosinte (Zea diploperennis), important in the context of human welfare?
A) Edible species, such as Z. diploperennis, can be used for food if all our food crops become extinct. B) Species such as Z. diploperennis can be used to manufacture anticancer drugs. C) Genes for pest resistance from species such as Z. diploperennis can be transferred to food crops. D) Genes from species such as Z. diploperennis can be inserted into imperiled livestock varieties to help prevent them from becoming extinct.
In a forest, trees that grow taller receive more sunlight and end up producing more viable seeds. Shorter trees of the same species receive less sunlight and produce few viable seeds. Over time, what type of selection will take place?
A. disruptive selection B. directional selection C. stabilizing selection D. sexual selection E. artificial selection