There are how many different kinds of RNA codons?
a. 3
b. 12
c. 28
d. 64
e. 120
D
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In eukaryotic organisms, a single-stranded break in the DNA is required before recombination can begin during meiosis
Indicate whether the statement is true or false
Which group of plants have phloem and xylem but lack seeds, flowers, and fruit?
A. ginkgo, cycads, conifers, and gnetophytes B. All plants have phloem and xylem but lack seeds, flowers, and fruit. C. monocots and eudicots D. ferns, club mosses, horsetails, and whisk ferns
What is unique about the actinomycetes?
a. they can produce antibiotics, anti tumor agents and immunosuppressants b. they lack a cell wall c. their spiral shape allows the to easily penetrate tissues d. they produce lots of environmental oxygen through photosynthesis
Which of these occurs during transcription?
A) The information coded in DNA is copied into mRNA. B) A DNA copy is used to direct the production of a polypeptide. C) A polypeptide is folded into a protein. D) Messages encoded in mRNA are used to build proteins. E) Protein processing is enhanced by enzymes.