If the multiregional hypothesis of human origins is correct, modern human populations last shared a common ancestor around _____ years ago. If the out-of-Africa hypothesis is correct, we last shared a common ancestor around _____ years ago
A. 2 million; 200,000
B. 3.2 million; 2 million
C. 5-7 million; 2 million
D. 5-7 million; 200,000
E. 3.2 million; 200,000
A
You might also like to view...
Impressive was a champion Quarter Horse stallion with a magnificent muscular physique, a trait that he passed on to dozens of offspring. However, many of Impressive's offspring developed periodic muscular twitching that sometimes left the horses temporarily unable to move. Some horses even died. As it turns out, Impressive's award-winning physique was due to a mutation in a single, protein-encoding gene, resulting in hyperexcitable muscle (which contracts even in the absence of a stimulus from its motor neuron). Which is NOT a plausible explanation for the identity of the abnormal muscle protein in Impressive and his offspring?
A. tropomyosin that is unable to bind to actin B. acetylcholine receptors that function in the absence of acetylcholine C. over-active troponin molecules D. leaky Na+ channels E. overactive Ca2+ pumps in the membrane of the sarcoplasmic reticulum Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about excitation of muscles? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Mucus contains an enzyme called ____ that chemically attacks and kills bacteria
a. lysozyme b. peroxide c. lipase d. lactase e. protease
In genetics, map units express the distance between:a
chromosomes during metaphase. b. two loci on a chromosome. c. alleles. d. polar bodies. e. homologous chromosomes.
Penicillin is a good example of a hapten.
Answer the following statement true (T) or false (F)