Plant cell walls consists mainly of ________.
A. chitin
B. peptidoglycan
C. cellulose
D. chlorophyll
C. cellulose
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What is the distribution of phenotypes from a cross of purple tall pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white; tall is dominant to dwarf.)
A. 63 purple tall; 28 purple tall; 27 white dwarf; 7 white dwarf B. 132 purple tall; 138 white dwarf C. 54 purple tall; 6 white dwarf D. 100% purple tall E. 27 purple dwarf; 28 purple tall; 31 white dwarf; 29 white tall
Which group of terms is in the correct developmental sequence?
a. microspore mother cell, meiosis, megaspore, female gametophyte. b. microspore mother cell, meiosis, microspore, pollen grain. c. megaspore, mitosis, female gametophyte, meiosis, endosperm mother cell. d. all of the above.
There is a mutation in a promoter next to a gene such that RNA polymerase can never bind. What steps must occur for the gene to be transcribed?
A) An activator protein must bind an enhancer. B) The DNA must physically bend so that the activator is close to the promoter. C) Transcription factors must bind to the activator and promoter. D) Transcription will never take place in this specific example.
Endosperm tissue of angiosperms has what ploidy level?
A. 2n B. 4n C. 8n D. 3n E. n