Cilia and flagella of eukaryotic cells are composed of:
A. nine triplets of microtubules in a circle.
B. actin filaments in a 9 + 2 arrangement.
C. protein fibers in a helical arrangement.
D. microtubules in a 9 + 2 arrangement.
Answer: D
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Organisms that reproduce asexually usually do so through the process of ____
a. mitosis b. meiosis c. gametogenesis d. spore formation e. fertilization
If a reaction absorbs free energy it is termed which of the following?
a. exergonic reaction b. endergonic reaction c. metabolic reaction d. bioenergetic reaction
The DNA sequence ATGCATGC will pair with which of the following DNA strands?
TACGTACG TACCTACC ATGCATGC TTGCATCC CGTACGTA
The thick layers of cells covering and protecting the delicate apical meristem is called the:
a. root cap. b. root hairs. c. pericycle. d. adventitious root. e. radicle