Along with the egg, in the part of an embryo sac next to the micropyle you should find ____

a. the central cell
b. a seed
c. the pollen tube
d. synergids
e. antipodal cells


ANSWER: d

Biology & Microbiology

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Polypoidy, which is widespread among plants, can arise from which of the following processes? (Choose all that apply)

A. duplication of a complete set of chromosomes in a single species B. hybridization between related species followed by duplication C. deletion of long stretches of noncoding DNA over time D. introduction of DNA from one species into another via insects and birds E. expansion of regions of highly repetitive DNA

Biology & Microbiology

The hormone erythropoietin causes _____

a. increased heart rate c. red blood cell formation b. deeper breathing d. all of these

Biology & Microbiology

Endodermis cells of the root secrete a waxy

substance on

a. all of their walls. b. the walls that lead into the xylem. c. the walls adjacent to the phloem only. d. walls of the endodermis that touch each other. e. their chloroplasts

Biology & Microbiology

Which of the following is associated with the production of multiple mRNAs from a single gene?

A) alternative splicing B) spliceosome mutations C) polycistronic organization D) gene rearrangement E) both spliceosome mutations and polycistronic organization

Biology & Microbiology