Which of the following is a difference between a viroid and a virus?
A. Viroids are alive and viruses are not.
B. Viroids are composed solely of nucleic acid while viruses are composed of nucleic acid surrounded by a protein coat.
C. Viroids are not infectious particles and viruses often cause disease.
D. Viroids infect only plants while viruses infect only animals and prokaryotes.
E. Viroids contain some genes important for their own replication while viruses rely entirely on host cell enzymes for their replication.
B. Viroids are composed solely of nucleic acid while viruses are composed of nucleic acid surrounded by a protein coat.
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Identify the major trends in primate evolution
What will be an ideal response?
Which sense is a special sense?
A) temperature B) pain C) touch D) taste
Which time period of Earth represents when evolution was progressing at the most rapid rate, as evidenced by fossils
such as those of the Burgess Shale? a. Silurian period b. Cambrian period c. Devonian period d. Ordovician period e. Carboniferous period
The skin cells of an adult female rat has 40 autosomes and 2 sex chromosomes. A healthy egg cell would contain which number and type of chromosomes?
A. 20 autosomes and 1 X chromosome B. 20 autosomes and 1 Y chromosome C. 40 autosomes and 2 X chromosomes D. 40 autosomes and 2 Y chromosomes