Arteries carry
a. blood away from the heart.
b. blood towards the heart.
c. only oxygen-rich blood.
d. only oxygen-poor blood.
e. a combination of more than one of these
A
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What mechanism used for mobilization of transposable elements can lead to deletions in genomes?
A) Transposase sometimes deletes genomic DNA while removing DNA transposons from the genome. B) Alignment of two transposable elements is required for mobilization and misalignment can result in deletions. C) RNA polymerase transcribes transposable elements; when it makes mistakes, DNA nucleotides are sometimes deleted. D) Piwi RNAs inhibit movement of transposons by deleting DNA that includes and surrounds the inverted repeats.
In pine trees, the male gametophyte is
a. a megaspore. b. the embryonic pine seed. c. a pollen tube. d. a pollen grain. e. a microspore.
Which of the following represents the male gametophyte of a conifer?
A) pollen grain B) sperm C) pollen cone D) tree
Which of the following is not an unsustainable practice of society?
A. using large amounts of fossil fuels, fertilizers, and pesticides B. reduction in population growth rate C. using more freshwater resources for agriculture than in homes D. deforestation and desertification E. eating more meat than vegetables