Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes
b. RNA can hold more information than DNA
c. the first protists had RNA as their genetic material
d. RNA's only role is that of an enzyme
e. protocells contained DNA
a
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Why is the movement of blood in veins sometimes described as "milking a vein"?
What will be an ideal response?
The theory of endosymbiosis is based on
A. evidence from the fossil record. B. the experiments in which bacteria were made to grow in plant cells forming chloroplasts. C. the knowledge that ribosomes are structures found in bacteria, plants, and animals. D. similarities between chloroplasts and other organelles in animals. E. the observations that chloroplasts and mitochondria resemble bacteria.
What gas do plants release during photorespiration?
A) water vapor B) oxygen C) carbon dioxide D) carbon monoxide
Which term refers to muscles that are attached to bones, and cause bones to move at their joints when they contract?
A. skeletal muscles B. smooth muscles C. involuntary muscles D. ligament tissues E. cardiac muscles