Phytoestrogens in plants
a. increase the production of megaspores.
b. function in the production of eggs.
c. increase the speed at which pollen tubes
reach the egg.
d. aid in the nuclear fusion of egg and sperm.
e. have nothing to do with plant reproduction.
E
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Macroscopic algae possess a special structure that acts as an anchor and is commonly called
A. a thallus. B. a holdfast. C. roots. D. the stipe.
Answer the following statements true (T) or false (F)
1) Crossing-over occurs in meiosis I and meiosis II. 2) Chromosome duplication occurs between meiosis I and meiosis II. 3) In animal cells, cell division is accomplished by the formation of a cleavage furrow. 4) Daughter cells produced in meiosis are identical. 5) Chromosome duplication occurs prior to both mitosis and meiosis.
The genetic code STOP codons are
a. AUG, UGA, and CAC. b. UAU, AAU, and GAU. c. UAA, UAG, and UGA. d. CAA, AGA, and AUG. e. all of these.
Which of the following is NOT a characteristic of plant cells?
A. Plasmodesmata are present. B. Plastids are present. C. Centrioles are present during mitosis. D. Cell wall is present.