Cells conserve energy and resources by making active proteins only when they are needed. If a protein is not needed, which of the following methods of control would be the most energy-efficient?
A. degrade the protein after it is made
B. prevent translation of the mRNA
C. block transcription
D. degrade the mRNA after it is made
Answer: C
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A disease that is transferred by direct intimate contact with a mortality rate over 90% would be an effective biological weapon
Indicate whether the statement is true or false.
Mycorrhizae
a. increase plant growth. b. are symbionts. c. allow a plant to absorb more water. d. increase the surface area for absorption of water and minerals. e. have all of these characteristics
In this figure of the amniote egg, which structure, A, B, C, or D, is the amnion?
1.A
2.B
3.C
4.D
Refer to the accompanying figure. Which statement about label 1 is FALSE?
a. It is haploid. b. It was produced by mitosis. c. It was produced from a megaspore. d. It is not a product of fertilization. e. It is part of the sporophyte generation.