Identify the plants in the photo at the right as male or female, gametophyte or sporophyte, moss or liverwort.
What will be an ideal response?
Male gametophyte of a moss.
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Several hypotheses have been proposed to explain the evolutionary origin of viruses. Which of the following does NOT assume that viruses evolved from living cells?
A. Viruses evolved from macromolecules - lipids, proteins, nucleic acids, and carbohydrates. B. Viruses evolved from plasmids that acquired genes for their own replication. C. Viruses evolved by losing all the genetic information that is not absolutely required for reproduction. D. The precursors of DNA genomes may have been self-replicating RNA molecules. E. Viruses evolved from chromosomal elements.
Water constantly enters the cells of a freshwater sponge by osmosis. How is the sponge adapted to handle this problem? a. Contractile vacuoles expel fluid to the outside of each individual cell
b. Action of cilia in flame cells drives interstitial fluid into tubes, then out of pores at the surface. c. Extra water and wastes are transported into Malpighian tubules that route them out of the body. d. Water is excreted through tubular excretory organs called nephridia.
Over evolutionary time, flowering plants have evolved colors, odors, and nectar that attract pollinating insects and the
insects have evolved mechanisms that detect the changes in plants and to better collect pollen. This is an example of ____.
a. allopatric speciation b. phylogenetic change c. coevolution d. a key innovation e. sympatric speciation
Which of the following is NOT a cell covering or part of a cell covering?
a. glycocalyx b. extracellular matrix c. cristae d. cell wall e. integrins