In a chi-square test to determine if two genes are linked or assorting independently, what is the default (null) hypothesis that is tested?
A. The genes are linked to one another
B. The genes are assorting independently
C. The genes are located on the sex chromosomes
D. No crossing over occurs
E. The distance between the genes is very small
B
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On mRNA molecules, a nontranslated sequence called the ________ usually precedes the initiation codon.
Fill in the blank(s) with the appropriate word(s).
Which statement describes the fern life cycle?
a. Gametophytes originate within, and are dependent upon, sporophytes b. Sporophytes originate within, and are dependent upon, gametophytes c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation e. Gametophytes are photosynthetic and partially independent from the sporophytes
Chemicals that are poisonous to specific cell types are said to be
a. hazardous. b. cytotoxic. c. allelochemicals. d. bioactive.
High-energy electrons from molecules of NADH and FADH2 are transferred to a chain of proteins within the electron transport chain. What is the final protein in the electron transport chain?
A. ubiquinone B. NAD+ C. oxygen D. carbon dioxide E. cytochrome c