Name the structure in which proteins associate with DNA and pack it very tightly by organizing the molecules.
A. Histones
B. Chromosomes
C. Lysosomes
D. Ribosomes
E. Homologous lysosomes
Answer: B
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A. uridylyltransferase B. glycosyltransferase C. ligase D. guanylyltransferase E. nucleotidyltransferase
If a plant has endosperm, double fertilization,
and anthers, of the following plants, it is most likely a(an)
a. orchid. b. pine tree. c. fern. d. moss. e. more than one of these
Which of the following are homologous?
A) the forelimb of a dog and the hindlimb of a cat B) the forelimb of a dog and the forelimb of a cat C) wings of a butterfly and wings of a sparrow D) the mouth of a mosquito and the beak of a hummingbird
Fibrinogen is __________.
a. a blood protein that is converted to fibrin to form a blood clot b. a blood protein that escorts lipids through the circulatory system c. a cell fragment involved in the blood-clotting mechanism d. a cell involved in fighting microorganisms e. a protein involved in oxygen transport