Plants are capable of growth throughout their entire lifespan because of specialized tissue known as the
A. petiole
B. cotyledon
C. xylem
D. meristem
Ans: D. meristem
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The 140 kbp genome containing many short repeats, ribosomal RNA genes, one RNA polymerase gene (rpo) and one RubisCO gene (rbcL) is most likely from a(n)
A) plant. B) autotrophic bacterium. C) chloroplast. D) autotrophic archaeon.
The double helix model of DNA suggested by Watson and Crick was exciting to the scientific community because:
a. it opened the door to new PCR based technologies. b. it explained how genetic material could be duplicated by means of the complementary strands. c. it suggested the role of DNA in protein synthesis. d. it proved once and for all that DNA was the messenger of heritable traits. e. All of the above are correct.
Ribosomes are the sites of ________ and are composed of rRNA and _________
Fill in the blank(s) with the appropriate word(s).
In humans, the _________ determines the sex of the offspring because __________.
A. male ... the sperm can fertilize either a female egg or a male egg B. female ... only the female has two functional sex chromosome C. male ... the male can contribute either an X or a Y chromosome D. chromosome contribution from both parents ... the offspring uses all the parents' chromosomes