The raw materials used for photosynthesis include
(a) O2.
(b) C6H12O6.
(c) CO2 & H2O.
(d) CH2O.
(c) CO2 & H2O.
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Which of the following statements describe advantages that seeds have over spores?
_____ Seeds have tough walls that allow dispersal through the air. _____ Seeds are produced in greater numbers. _____ Seeds are able to store food. _____ Seeds employ various means of dispersal, allowing colonization of more diverse habitats. _____ Production of seeds does not require water as a medium for sperm transport.
Random segregation of chromosomes (by itself) means that a particular daughter cell
a. has some paternal chromosomes and some maternal chromosomes. b. has only paternal chromosomes. c. has only maternal chromosomes. d. has chromosomes containing genes from the paternal and maternal chromosomes. e. has some paternal chromosomes and some maternal chromosomes and has chromosomes containing genes from the paternal and maternal chromosomes.
Which of the following is a milestone prokaryotic transcription initiation?
a. polymerase synthesizing mRNA in the 5’ to 3’ direction b. formation of a stable hairpin c. opening of the transcription bubble d. polymerase stalling in a region that is rich in A-T nucleotides
A transposon is
A) a DNA segment that can insert itself at one or more sites in a genome. B) a "jumping gene." C) a DNA segment that may cause mutations in genes or chromosomal rearrangements. D) a mobile genetic element that may or may not leave a copy of itself in its original site when it moves to a new site. E) All of these