What is the oldest eukaryotic fossil that can be clearly linked to a living group of eukaryotes?
A. thermophillic archaea
B. brown algae
C. red algae
D. sulfur loving bacteria
C
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Which of the following statements about root cap is FALSE?
a. It protects the delicate root apical meristem b. It secretes lubricating polysaccharides c. It orients the root that it grows downward d. It loses cells during root growth. e. It absorbs nutrients.
A plant growth response to mechanical stress, such as rain and contact with passing animals, is known as:
a. phototropism. b. gravitropism. c. thigmomorphogensis. d. a circadian rhythm.
e. thigmotropism.
You suspect a 100-nm structure is present in a cell. Which of the following provides the lowest magnification that you can use to see this structure?
a. Transmission electron microscope b. Phase-contrast microscope c. Scanning electron microscope d. Brightfield microscope e. Darkfield microscope
A substance that may trigger an immune response, if presented in the right context is termed a(n)
A) cytokine. B) antigen. C) effector. D) antibody. E) hapten.