In his 1771 experiments, Joseph Priestly determined that plants added something to the air that allow an animal to survive. What do we now know that plants contribute to the air that is essential for animals (and other organisms)?
A. oxygen
B. water
C. organic sugars
D. carbon dioxide
Answer: A
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Chargaff's rules for the pairing of nitrogen bases is
A. A = C and G = T. B. A = T and G = C. C. A = G and C = T. D. A+T = G+C.
The inner mitochondrial membrane contains numerous inward folds called cristae, which greatly increase the surface area of this membrane. Because ATP is produced on the inner mitochondrial membrane, cristae enhance the ability of the mitochondria to generate ATP. What structure can be thought of as similar to these cristae?
A. Spiracle B. Finger-like projections of a human's small intestine C. Bronchiole D. Cartilage
A couple who does not have cystic fibrosis but are both heterozygous has already had three girls with cystic fibrosis,
and are hoping to have a normal child for their fourth. What are the chances that the fourth child will be a normal male? a. 0 b. 1/8 c. 1/4 d. 3/8 e. 1/2
Evolution of the globin gene family has been characterized by
a. duplication and divergence of genes. b. fusion of exons. c. duplication of gene clusters. d. mutations creating pseudogenes. e. All of the above.