Plants with mutant ABA receptors are likely to have problems with
A. pollen tube formation.
B. fertilization.
C. seed dormancy.
D. endosperm formation.
Answer: C
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Arrange the following electron carriers in the electron transport chain, based on their standard reduction potentials.Cytochroms a3(Fe3+) + e- ? Cytochrome a3 (Fe2+) Eo (volts) = 0.35Ubiquinone + 2H+ + 2e- ? Ubiquinone H2 Eo (volts) = 0.10Cytochrome a (Fe3+) + e- ? Cytochrome a (Fe2+) Eo (volts) = 0.29Cytochrome c (Fe3+) + e- ? Cytochrome c (Fe2+) Eo (volts) = 0.25
A. ubiquinone - cytochrome a - cytochrome a3 - cytochrome c B. cytochrome a3 - cytochrome a - cytochrome c - ubiquinone C. ubiquinone - cytochrome c- cytochrome a- cytochrome a3 D. cytochrome c - ubiquinone - cytochrome a - cytochrome a3
Which statement best explains why modern seedless vascular plants are confined largely to wet or humid environments?
a. They require external water for reproduction. b. They do not have true roots. c. They lack stomata. d. They have a dominant sporophyte generation. e. They do not have flowers or fruits.
Which of the following statements about vitamins is false?
a. Water-soluble vitamins include vitamin C. b. Taking too many vitamins, particularly fat-soluble vitamins, can be harmful. c. Fat-soluble vitamins include vitamin B2. d. Water-soluble vitamins, if consumed in excessive amounts, will be excreted in the urine. e. Water-soluble vitamins are picked up by individual cells from capillary beds.
Lysogeny is most likely associated with transduction
Indicate whether the statement is true or false