Pollen grains contain:
A) sperm. B) eggs. C) spores. D) wings.
Answer: A
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In 1665, ________ used a microscope that he had built to examine thin slices of ________. While examining this material, he observed tiny compartments that he called cellulae.
A) Theodor Schwann; animal tissue B) Robert Hooke; cork C) Antonie van Leeuwenhoek; sperm cells D) Robert Brown; plant material E) Rudolf Virchow; collagen
Tuberculin skin testing
A. uses a purified protein filtrate of Mycobacterium tuberculosis. B. will be positive in active TB. C. involves the injection of PPD intradermally. D. will be positive if person has had previous exposure. E. All of the choices are correct.
The chromatids detach from one another and become visibly separated chromosomes during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
Changes in the arterial blood pressure are detected by __________ located in the walls of the carotid artery and the arch of the aorta.
A. pacemakers B. osmoreceptors C. Purkinje fibers D. baroreceptors E. bundle branches