________ organisms such as green and purple bacteria derive electrons from sulfide, thiosulfate, and succinate to generate NADPH
Fill in the blank with correct word.
Answer: Anoxygenic phototrophs
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The pollen tube grows from the ________ to the ________
a. sperm / stigma b. ovule / anther c. stigma / ovule d. anther / sperm
How do you calculate the total magnification?
What will be an ideal response?
What triggers the entry of a cell into mitosis?
a) the addition of inhibitory phosphate groups to Cdk1 by the Wee1 kinase b) the removal of inhibitory phosphase groups from Cdk1 by the Wee1 kinase c) the addition of inhibitory phosphate groups to Cdk1 by the Cdc25 phosphatase d) the removal of inhibitory phosphate groups from Cdk1 by the Cdc25 phosphatase
Which of the following is the best explanation for the fact that most transduction pathways have multiple steps?
A) Most of the steps were already in place because they are steps in other pathways. B) Multiple steps in a pathway require the least amount of ATP. C) Multiple steps provide for greater possible amplification of a signal. D) Each individual step can remove excess phosphate groups from the cytoplasm. E) Each step can be activated by several G proteins simultaneously