Nucleotides in each strand of DNA are held together by what type of bonds?
a. ionic
b. phosphodiester
c. peptide
d. hydrogen
Ans: b. phosphodiester
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Banner-tailed kangaroo rats, Dipodomys spectabilis, are rodents endemic to (found only in) the deserts of the southwestern United States. Which of the following is the best description of their niche?
A. seed-eating rodents that compete with other seed-eating organisms for food B. found in parts of Arizona, New Mexico, Texas, and Mexico C. found primarily in Sonoran and Chihuahuan deserts D. found only in arid habitats E. found primarily in areas with relatively heavy soils
The theory illustrated in Figure 21-1 is supported by which piece of additional evidence?
a. The results of the Miller-Urey experiment.
b. Burgess shale fossils.
c. Ediacarian fossils.
d. The presence of DNA in some organelles.
e. All answers support the illustrated theory
The vaccine for which of these pathogens is an inactivated vaccine?
A) Hepatitis B) Human papillomavirus C) Influenza D) MMR E) Chicken pox
What are similar cells that are grouped together and perform a common function called?
A) tissues B) organs C) organ systems D) accessory organs