Theodore Diner was researching which of the
following plant diseases when he discovered the first
viroid?
Chapter 21 Viruses and Prokaryotes 3
a. potato spindle tuber disease
b. tulip variegation
c. tomato root rot
d. chestnut blight
e. all of the above
Answer: a
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What is the structure that holds the chromatids together?
A. karyotype B. centromere C. chromatin D. chromosomes E. none of these
Early in the Earth's history, there was a massive "supercontinent" known as
a. Gondwana. b. Pangea. c. Botswana. d. Pellagra. e. Panagra.
Which blood constituent makes up most of the volume of blood?
A) White blood cells B) Red blood cells C) Blood proteins D) Plasma
Which of the following statements concerning transcription is true?
a. All types of RNA in the cell are synthesized by transcription, which uses a portion of DNA as a template for copying. b. Promoter sequences signal the end of a gene and mark the place where transcription stops. c. Transcription is the process whereby identical copies of DNA are made in preparation for cell division. d. During transcription, entire chromosomes are copied because the starting position of genes is unknown.