What two factors influence the distribution of seaweeds the most?
a. Light and nitrogen
b. Temperature and light
c. Light and carbon dioxide
d. Temperature and nitrogen
b
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A model organism called Caenorhabditis elegans (a soil nematode) has been used to study cell signaling during development because of its simplicity. For example, a structure such as the vulva arises from only three cells, which are called ____ cells
Fill in the blank with the appropriate word.
The genome of retroviruses is made of
A. ssDNA. B. dsDNA. C. ssRNA. D. dsRNA.
Alkylating agents work to prevent the cell from replicating its genetic material, thus preventing cell division. At which checkpoint would the cell most likely stop?
A. M checkpoint B. S checkpoint C. G1Â checkpoint D. G2Â checkpoint
The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of inheritance does this demonstrate for flower color in these plants?
A. complete dominance B. lethal alleles C. incomplete dominance D. codominance E. complementation