The formation of amino acids under abiotic conditions was important because they serve as ____

a. a supply of structural units for proteins
b. enzymes to catalyze reactions
c. subunits in the formation of DNA
d. subunits in the formation of RNA
e. subunits for the formation of lipids


ANSWER: a

Biology & Microbiology

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The variation seen among individuals when each individual shows one of two—or very few—easily distinguishable traits is known as _____ variation.

a. continuous b. discontinuous c. dominant d. recessive

Biology & Microbiology

Master genes that affect development tend to be highly ____; therefore, similarities in patterns of embryonic development reflect shared ancestry that can be evolutionarily ancient.

a. homologous b. degraded c. conserved d. mutated e. related

Biology & Microbiology

The aerobic respiration process ends in what area of the

eukaryotic cell? a. photosynthetic b. cytoplasm c. mitochondria d. the Krebs cycle e. gap junction

Biology & Microbiology

Each genetically distinct group of lymphocytes that possesses the same specificity is called a _____.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology