All of the following are components of peptidoglycan EXCEPT
a. N-acetylglucosamine
b. N-acetylmutamic acid
c. lipopolysaccharide
d. amino acids
e. peptide cross-links
Ans: c. lipopolysaccharide
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Why is energy lost when herbivores eat primary producers?
A) Primary producers have energy stored in indigestible substances. B) Primary producers cannot produce once eaten. C) Digestion takes place so rapidly that very little energy is absorbed. D) Most primary producers contain no usable energy for herbivores.
You are given two nucleic acids; one RNA and the other DNA. What are the main features to determine which is the DNA?
_____ DNA will have thymine instead of uracil in its nitrogenous bases. _____ DNA will have a double-stranded structure. _____ DNA will have ribose as the sugar in its backbone. _____ DNA will have uracil instead of thymine in its nitrogenous bases. _____ Adenine will be present in the DNA.
What are leaf veins?
a. vascular bundles of leaves b. photosynthetic cells of leaves c. sclerenchyma cells of leaves d. palisade mesophyll of leaves e. spongy mesophyll of leaves
The phenomenon in which one region of the body grows faster than another among different species is called
A. heterochrony. B. paedomorphosis. C. Gremlin and BMP4 interaction. D. phenotypic variation. E. Hox gene clustering.