Why are echinoderms and chordates closely related?
A. Because they share adaptations that other phyla do not have
B. Because they are often found together as fossils
C. Because they have the same type of body symmetry
D. Because they look similar
Answer: A
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Active transport is different from simple diffusion in that active transport
A. requires energy. B. All of the answer choices are correct. C. moves molecules against a concentration gradient. D. requires transport proteins embedded within the cell membrane. E. moves molecules from an area of lower concentration to an area of higher concentration.
A triglyceride molecule is made up of ____
a. one glycerol and two fatty acids b. two fatty acids and two glycerols
c. one fatty acid and three glycerols d. one glycerol and three fatty acids e. one glycerol and two fatty acids
Of the following structures, which one is not a specialized cell of the epidermis?
A. guard cells B. oil glands C. sclereids D. root hairs E. trichomes
Which of the following occurs during anaphase I?
A) Cytokinesis occurs. B) Homologous chromosomes are separated. C) Sister chromatids are separated. D) Homologous chromosomes are moved to the metaphase plate. E) Crossing over begins.