Cilia and flagella of eukaryotic cells are composed of
A. nine triplets of microtubules in a circle.
B. protein fibers in a helical arrangement.
C. actin filaments in a 9 + 2 arrangement.
D. microtubules in a 9 + 2 arrangement.
Answer: D
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A genetic _____ indicates the distances between gene loci measured in terms of the frequency of recombination.
A. map B. profile C. pedigree D. clone E. karyotype
Centromeres are:
A. sequences on the eukaryotic chromosome that function as an attachment point for proteins linking the chromosome to the mitotic spindle. B. sequences at the ends of the eukaryotic chromosome that add stability to linear DNA sequences. C. the sites at which replication initiates in bacteria. D. sequences in the bacterial chromosome at which the kinetochore forms. E. GC-rich sequences that code for the proteins forming the kinetochore.
The unit of contraction that composes a muscle cell is called what?
a. troponin components b. myofilaments c. sarcomere d. sarcoplasmic reticulum
Upon closer inspection of the leaves of "flower of stone," one can observe tiny, cone-like structures. Each cone-like structure emits spores of two different sizes
Further investigation also reveals that the roots of "flower of stone" branch only at the growing tip of the root, forming a Y-shaped structure. Based on these additional observations, which of the following can be properly inferred about "flower of stone"? 1. It is heterosporous. 2. It is a fern. 3. The cone-like structures are sori. 4. It is a lycophyte. 5. It has separate male and female gametophytes. A) 1 and 5 B) 2 and 3 C) 1, 2, and 3 D) 1, 4, and 5