The deepest, most fertile topsoil is usually in:
a. deserts
b. savannas
c. temperate grasslands
d. temperate forests
e. tropical rain forests
c
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Answer the following statements true (T) or false (F)
1. Apoptosis through the extrinsic pathway is activated by factors such as lack of oxygen or growth factors. 2. Apoptosis is used in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer. 3. Ligands that promote cell death are typically found on the surface of cells of the immune system that recognize abnormal cells and target them for destruction. 4. The most prominent tissue type present in plants is the dermis.
A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?I - The calcium-troponin complex pulls tropomyosin away from the myosin-binding sites of actin.II - The freed-sites of actin bind to myosin to form cross-bridges.III - Calcium ion binds to the troponin.
A. I, II, and III B. III, II, and I C. I, III, and II D. II, III, and I E. III, I, and II
Chromosome number for a species is 34. When a cell divides by meiosis the daughter cells have how many
chromosomes? a. 17 b. 34 c. 51 d. 68 e. 119
Which of the following is a possible partial genotype for the son?
A) IBIB B) IBIA C) ii D) IBi E) IAIA