Buchnera aphidicola provides ________ to its aphid host that are essential to the survival of the insect.
A. amino acids
B. cellulases
C. vitamins
D. carbohydrates
Answer: A
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The scientist(s) given credit for adding the third component (which contradicted spontaneous generation) to the cell theory is/are
A. Louis Pasteur. B. Mathias Schleiden and Theodore Schwann. C. Robert Hooke. D. Rudolf Virchow. E. Antony van Leeuwenhoek.
The interaction between two species in which
both species may be harmed is known as
a. parasitism. b. mutualism. c. competition. d. predation. e. commensalism
Decomposers recycle materials at ____ trophic
level(s). a. the first b. the second c. the third d. the fourth e. any of these
The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells?
A) mitosis B) meiosis C) mitosis without subsequent cytokinesis D) meiosis without subsequent cytokinesis