The ____________ model of hominid evolution suggests that the gradual evolution of homo erectus into modern human (homo sapiens) populations took place in different regions of the old world, not in one area of the world.
a. multiregional
b. replacement c.
c. “Garden of Eden”
d. “Eve hypothesis”
Answer: a. multiregional
The Eve hypothesis states that the early ancestors of modern humans can all be traced down to one place- Africa. The Multi regional model, in a way, grows on this model and states that the human species itself dates back to 2 million years and since then, it has evolved to its current form all over the world and is not restricted to one region of the world.
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In which digestive structure is food called bolus?
a. in the liver b. in the small intestine c. in the large intestine d. in the mouth
At fertilization, the sperm binds to a receptor on the surface of the egg and fuses with the plasma membrane, initiating the development of a new diploid organism. Which of the following statements about fertilization is false?
a. Binding of a sperm to its receptor on the egg induces an increase in cytoplasmic calcium. b. The progression of metaphase II to anaphase is triggered by the activation of MPF. c. Eggs are arrested at metaphase II of meiosis and fertilization leads to anaphase progression. d. Once fertilized, secretory vesicles are exocytosed, leading to an alteration in the extracellular coat of the egg to prevent additional sperm entry.
Over evolutionary time, DNA replaced RNA as the primary molecule holding the code for genetic information because DNA is believed to be more chemically stable. Which attribute of DNA is the reason behind its chemical stability?
a) DNA lacks a free hydroxyl group on the 2?-carbon atom of its sugar. b) Unlike RNA, DNA is usually double-stranded. c) DNA does not usually form hairpin loops. d) One of the two pyrimidines found in DNA does not involve uracil. e) DNA contains thymines, which make it more chemically stable.