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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Ribosomes are the sites of ________ and are composed of rRNA and _________

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology