In the diagram below, the gray unit represents _____. The figure shows a blue molecule arranged in the form of a double chain. The gray unit on this figure represents an oval structure which contains unwound and unpaired chains of this molecule. Before and after this unit, the molecule is wound in the form of a double helix. A green unit represents a part of the double helix before the gray unit.
a. RNA
b. DNA
c. transcription factors
d. RNA polymerase
e. the promoter
Answer: d. RNA polymerase
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Which of the following statements about collagen is INCORRECT?
A. There can be numerous types of collagen in multicellular organisms B. It is produced from polymers of amino acids. C. It tends to promote the "sticky" characteristics of the ECM. D. Its breakdown is a contributing characteristic of wrinkling during aging. E. It is a major component of the ECM for cartilage and bone.
A chi-square test is used to
a. determine if experimental data adequately matches what was expected. b. analyze a Punnett square. c. determine parental genotypes producing a given offspring genotype. d. determine if a trait is dominant or recessive.
Which of the following quantities of alcoholic
beverages have the least damaging effect on the liver? a. 12 ounces of beer b. 5 ounces of wine c. 1.5 ounces of vodka d. either 12 ounces of beer or 5 ounces of wine e. all have the same amount of ethanol and therefore have similar effects on the liver
In frogs, the gray crescent appears
a. after the egg matures. b. after fertilization. c. during blastula formation. d. following gastrulation. e. as a result of tissue specialization.