Garrod hypothesized that "inborn errors of metabolism" such as alkaptonuria occur because _____
A) metabolic enzymes require vitamin cofactors, and affected individuals have significant nutritional deficiencies
B) enzymes are made of DNA, and affected individuals lack DNA polymerase
C) certain metabolic reactions are carried out by ribozymes, and affected individuals lack key splicing factors
D) genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes
D
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After ATP donates a phosphate group in a couple reaction, it becomes ADP. The ADP can be converted back to ATP in a(an) ____ reaction.
A. hydrolysis B. endergonic C. catabolic D. equilibrium E. exergonic
As producers, what inputs do plants require for the process of photosynthesis?
a. oxygen and sunlight b. oxygen and carbon dioxide c. carbon dioxide and sunlight d. carbon dioxide, oxygen, and sunlight
Earthworms have multiple hearts that pump blood throughout the body in vessels. They also ingest soil, digest the organic matter, and eliminate the indigestible particles as castings. Earthworms have which of the following?
A. an incomplete digestive tract and a partially open and closed circulatory system B. a complete digestive tract and open circulatory system C. an incomplete digestive tract and open circulatory system D. a complete digestive tract and closed circulatory system E. an incomplete digestive tract and closed circulatory system
Crossing over
a. generally results in binary fission. b. involves centrioles. c. involves breakages and exchanges between sister chromatids. d. results in new combinations of alleles being channeled into the daughter cells. e. does all of these.