Which phrase best describes a homologous chromosome pair?
a. two chromosomes that have the same genes in the same order, but have different alleles
b. two chromosomes that have different genes in the same order, and possibly have different alleles of some genes
c. two chromosomes that have the same alleles of the same genes in the same order
d. two chromosomes that have different alleles of the same genes arranged in a different order
Answer: a. two chromosomes that have the same genes in the same order, but have different alleles
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One mole of a substance contains 6.02 x 1023 molecules. The atomic number of Li is 3 and the atomic mass is approximately 7 . If you have three moles of Li, how many grams does it weigh?
A. 9 B. 21 C. 7 x 6.02 x 1023 D. 3 x 6.02 x 1023
Domestication results from __________ selection, rather than __________ selection
a. natural; artificial b. artificial; natural
Deserts are usually found between what
latitudes? a. 0?15 degrees b. 15?25 degrees c. 25?40 degrees d. 40?60 degrees e. 60?90 degrees
The white cliffs of Dover are composed mostly of foraminiferans shells. These organisms move by pseudopodia and feed by phagocytosis. Foraminiferan shells are made of which of the following?
a. Cellulose b. Calcium carbonate c. Chitin d. Peptidoglycan e. Silica