Which of the following is not true of viroids?
A. Viroids are small circular ssRNA molecules.
B. Extracellular viroids have a lipid bilayer envelope.
C. Viroid RNA does not serve as mRNA nor does it direct the synthesis of mRNA.
D. Viroids have no protein capsids.
Answer: B
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What is the main food source for walruses?
a. Molluscs and echinoderms b. Penguins c. Seagrass d. Fish and worms
If red flowers (R) is dominant over white flowers (r), plants with RR ____
a. are heterozygous b. are homozygous dominant c. have red flowers d. have white flowers e. have pink flowers
The variation among individuals, on which natural selection acts, describes
A) nutritional differences. B) random occurrences in the lifetimes of individuals. C) genetic differences. D) physical training and exercise.
Which of the following occurs during metaphase?
A. Chromosomes are about 30 nm wide. B. Heterochromatin is converted to euchromatin. C. The "beads on a string" structure is visible. D. Chromosomes undergo gene transcription. E. Chromosomes are much shorter than they were in interphase.