Leaf folding by the sensitive plant is due to changes in the water content of cells within structures called
A. pulvini.
B. aerenchyma.
C. cryptochromes.
D. statoliths.
Answer: A
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Most eukaryotic cells contain mitochondria, but a few single-celled eukaryotic organisms found in oxygen-free environments do not
Which of the following observations led biologists to reject the hypothesis that these mitochondria-free eukaryotes evolved BEFORE the endosymbiotic event that established mitochondria in other eukaryotes? A. All eukaryotes exhibit some sort of energy utilization. B. Some eukaryotes don't have mitochondria, they have chloroplasts instead. C. The nuclear genome of these mitochondria -free eukaryotes contains relics of mitochondrial genes. D. All eukaryotes have remnant chloroplast genes.
Which of the following organisms would likely be an r-strategist?
A. humans B. pine trees C. whales D. kangaroos E. owls
When ionic bonds are formed
1.atoms share electrons. 2.atoms either gain or lose electrons. 3.the atomic number of an atom changes. 4.isotopes are formed.
The reverse of a dehydration synthesis reaction is a(n) ________ reaction
A) anabolic B) exchange C) hydrolytic D) endothermic E) metabolic