All of the following are examples of adaptations EXCEPT
A) flower coloration that attracts pollinators.
B) larger teeth in beavers for gnawing wood.
C) mice learning a maze to get food.
D) different beak shapes for birds that eat seeds or insects.
E) insects that resemble twigs.
C
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Chargaff found several facts about the base composition of DNA. One of these rules is
a. There is a 1:1 relationship between G and T. b. There is a 2:1 relationship between purines and pyrimidines. c. The amount of A equals the amount of T. d. The amount of purines is half the amount of pyrimidines. e. None of these are true.
The ________ reaction sequentially links adjacent amino acids into the growing polypeptide chain.
A. transpeptidation B. dipeptidation C. propeptidation D. peptidation
In eukaryotic cells, steroid hormones
A) bind to cytoplasmic receptors, are transported to the nucleus, bind DNA, and regulate gene expression. B) bind to cell surface receptors and send signals that result in regulation of genes in the nucleus. C) act as enhancers and bind to an assortment of activators and repressors. D) methylate DNA to regulate gene expression. E) cause maternal effect.
Enzymes catalyze reactions by stabilizing the ________ in the reaction
Fill in the blank(s) with the appropriate word(s).