Which list of traits is characteristic of the ecdysozoans?
A. Periodically shed their outer covering, nonsegmented body plan and contain a layer of jellylike fluid called mesoglea, contain an exoskeleton, and undergo metamorphosis.
B. Periodically shed their outer covering, segmented body plan and pseudocoelom on some, contain an endoskeleton, and undergo metamorphosis.
C. Periodically shed their outer covering, nonsegmented body plan and pseudocoelom on some, contain an exoskeleton, and undergo metamorphosis.
D. None of the these are correct.
Answer: C
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Prosimians are:
A. small, primitive primates B. professional animal trainers C. primitive australopithecines D. the most advanced primates E. none of the choices provided
Hamilton explained the origin of altruism in selected insect societies with his kin selection model of sex determination. Since males are haploid and females are diploid, the workers share a very high proportion of alleles, theoretically as high as 75%. What is this called?
A. diploidy B. haploidy C. haplodiploidy D. parthenogenesis E. altruism
The presence of a transit sequence directs a protein from the ________ to the ________
A) cytosol; mitochondrion or chloroplast B) endoplasmic reticulum; Golgi apparatus C) cytosol; plasma membrane D) endoplasmic reticulum; nucleus E) signal recognition particle; nucleus
Dentinogenesis imperfecta is a rare, autosomal, dominantly inherited disease of the teeth that occurs in about one in 8000 people. The teeth are somewhat brown in color, and the crowns wear down rapidly. Assume that a male with dentinogenesis imperfecta
and no family history of the disease marries a woman with normal teeth. What is the probability that their first child will have dentinogenesis imperfecta? A) 1/4 B) 1/8 C) 1/2 D) 100% E) 3/4