Prions are created when normal proteins in the body ____
a. combine with large ribosomal subunit and become infectious
b. exchange several long sections of amino acids with other infected proteins
c. refold into a different and infectious three-dimensional shape that kills cells in the brain and nervous system
d. undergo mutation and create hundreds of copies of themselves
e. invade the immune system, causing it to mistakenly destroy the body’s healthy tissue
c
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Conifers are particularly common in mountain and high-latitude forests. What key characteristics of conifers give them an advantage over other plant phyla in these biomes?
_____ production of resin. _____ the conical shape of the tree. _____ leaves with a relatively large surface area. _____ flexible branches. _____ a waxy cuticle. _____ tori. _____ loss of leaves during the winter months.
What type of inheritance pattern does Tay-Sachs Disease exhibit?
a. Autosomal recessive b. Autosomal dominant c. X-linked recessive
If a population has an allele frequency of 1.0, you would say that
A) the allele frequency is ideal. B) genetic variation of that allele is low. C) genetic variation of that allele is high. D) that allele is under selection.
What is a unique feature of some New World monkeys that Old World Monkeys do not have?
a. long limbs b. four footed c. prehensile tail d. opposable thumb e. nostrils directed downward