Some protists live in "houses" constructed exclusively of organic molecules. These "houses" are called:
A. calcium carbonate skeletons.
B. silica skeletons.
C. cell walls.
D. tests.
E. None of the answers options is correct.
D
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The probable extinction of the ivory-billed woodpecker was mainly driven by
A. direct exploitation. B. introduced species. C. habitat destruction. D. climate change. E. genetic drift.
Which of the following is not part of the shoot system of plants?
a. the stem b. the flower c. fruit d. taproot e. branches
In the processes of endocytosis and exocytosis, a molecule is moved across the plasma membrane by a protein, which changes shape or orientation.
a. true b. false
Potato spindle-tuber disease, which causes potatoes to become gnarled and cracked, is caused by an infectious agent consisting of a small circular RNA molecule that totally lacks a protein coat. These infectious agents are thought to exert their effects by interfering with the cell's normal path of gene expression. Such an infectious agent is known as a(n) __________.
A) eviscerion B) viroid C) provirous D) bacteriophage E) virunette