Despite living their entire lives in saltwater, most marine invertebrates do not struggle with the hypertonic environment. Which of the following explains this phenomenon?
a. Their body fluid concentrations conform to changes in seawater concentration through physiological adaptations.
b. Their cells have seawater inside of them, making them isotonic to their environment.
c. They absorb extra water at all times to dilute the salt concentration.
d. They are capable of metabolizing the salt in vast quantities and excreting the sodium and chlorine.
a. Their body fluid concentrations conform to changes in seawater concentration through physiological adaptations.
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What is an argument against the theory that RNA was the first polymer of life?
a. Only limited replication of proteins is possible. b. The transfer of information from RNA to DNA under primordial conditions is difficult. c. The primordial nucleotides could not form a polymer. d. RNA cannot transfer genetic information to xeno-nucleic acids. e. The synthesis of RNA nucleotides under primordial conditions is difficult.
Experiments that utilize the deletion of a gene are referred to as ____ experiments
a. ablation b. control c. deletion d. knockout e. tinman
Current research indicates that species richness increases proportionately with the
a. number of plants in the region. b. latitude. c. longitude. d. amount of resources available. e. stage of succession.
The seeds in a pod of one of Mendel's pea plants are:
A) produced only when a plant is cross-fertilized. B) genetically identical to each other but different from other peas in other pods. C) each the result of a separate fertilization event. D) genetically identical to each other and all other peas from that plant. E) produced only when a plant is self-fertilized.