Tetrads are:
A. composed of a pair of nonhomologous chromosomes.
B. composed of two pairs of sister chromatids.
C. formed in prophase II of meiosis.
D. lined up along the cell axis during metaphase II.
E. formed during DNA synthesis.
B
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Which statement about electrons is true?
a. Electrons reside outside of the nucleus and have a charge of -1. b. Electrons reside inside of the nucleus and have a charge of +1. c. Electrons have a mass of 1 and a charge of +1. d. Electrons have a mass of 1 and a charge of -1.
Due to gene transfer between the organelles and the nucleus,
A) mitochondrial genomes in all species have the same genes. B) a chloroplast from one plant species can be transferred to any other plant species. C) mitochondria and chloroplasts have genes that allow them to live independently. D) some proteins must be imported into organelles for their function. E) organelle genomes experience lower rates of mutation than they would if gene transfer did not occur.
Judging by the nature of modern humans, chimpanzees, and bonobos, which of these traits did the last common ancestor of all three probably NOT show?
A) some form of culture B) tool use to get and process food C) a broad diet including plenty of fruit D) strictly heterosexual mating patterns E) some degree of hunting
Which is incorrect about cnidarians?
A. They exhibit radial symmetry. B. They are herbivores that eat phytoplankton only. C. They exist as medusae and/or polyps. D. Medusae are commonly called jellyfish. E. They undergo extracellular digestion.