What important ecological role do lichens play?
What will be an ideal response?
Lichens play an important ecological role by colonizing places too hostile for most organisms, such as exposed rocks. They break down the rock and produce soil by releasing acids and by holding water that freezes and thaws. When soil forms, plants can move in and take root.
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Imagine that a cell has a genetic mutation so that the primase enzyme is unable to make RNA strands
Assuming that all of the other enzymes directly involved in DNA replication are still functional in these cells, how much of the process of DNA replication would you expect to see in these cells?
a. The leading strand would be synthesized, but not the lagging strand. b. None of it at all, no part of the DNA replication process could occur. c. The DNA helix would be unwound by helicase, but no new strands will be produced at all. d. Both the leading and lagging strand would be synthesized, but pieces of discontinuous strands would not be joined together. e. DNA replication would still proceed completely, since RNA strands are not part of the final product of DNA replication.
Which is NOT true of prokaryotes?
A) They contain ribosomes. B) Their cells contain a true nucleus. C) Their genes contain exons. D) They include bacteria. E) They are single-celled organisms.
Which of the following statements about the autonomic nervous system is NOT true?
A. The functions of the autonomic system are generally involuntary and subconscious. B. The sympathetic nervous system deals with "fight-or-flight" responses. C. The autonomic nervous system regulates the activities of cardiac and smooth muscle and glands. D. The parasympathetic nervous system promotes actions associated with relaxation. E. The neurotransmitter associated with the parasympathetic system is norepinephrine.
A major difference between gymnosperm and angiosperm seeds is that:
A) gymnosperm seeds are not surrounded by fruit. B) gymnosperm seeds are haploid. C) angiosperm seeds are haploid. D) angiosperm seeds are larger. E) gymnosperm seeds are larger.