What would life on Earth be like today if eukaryotic protists had not evolved?
What will be an ideal response?
Life on Earth would most likely be a diversity of prokaryotes, but no eukaryotes. This is because plants, animals, and fungi likely evolved from protists that subsequently underwent radical changes in their cellular structure and eukaryotic design.
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The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is
A. sarcoplasmic reticulum. B. endoplasmic reticulum. C. transverse tubules. D. Golgi bodies. E. troponin.
During which phases of mitosis are chromosomes composed of two sister chromatids?
a. prophase only b. prophase and metaphase c. prophase and anaphase d. anaphase and telophase e. chromosomes are composed of two sister chromatids during all phases of mitosis
Leukocyte movement from blood to the site of tissue damage or infection involves ________, leukocyte movement toward the blood vessel wall; ________, the movement of leukocytes between endothelial cells of the blood vessel; and ________, the movement within the tissue to the site of injury.
A) margination : diapedesis : chemotaxis B) diapedesis : margination : chemotaxis C) chemotaxis : diapedesis : margination D) margination : chemotaxis : diapedesis E) chemotaxis : margination : diapedesis
Which of the following statements about the newly synthesized strand of a human chromosome is true?
(a) It was synthesized from a single origin solely by continuous DNA synthesis. (b) It was synthesized from a single origin by a mixture of continuous and discontinuous DNA synthesis. (c) It was synthesized from multiple origins solely by discontinuous DNA synthesis. (d) It was synthesized from multiple origins by a mixture of continuous and discontinuous DNA synthesis.