Which of the following is considered a simple tissue?
a. parenchyma
b. phloem
c. epidermis
d. xylem
a
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Sponges move huge volumes of water through their bodies every day
Although this serves the function of filter feeding for the organism, how might this also provide an "ecosystem" service (something that affects and/or benefits other organisms in their environment)? A. They can filter small poisonous fish out of the water that may harm other organisms. B. They create small currents in their microenvironment that help to circulate and clean water locally for other organisms. C. They produce large numbers of gametes that will become food for other sponges.d. Their body chambers serve as places where smaller organisms can live and be protected from certain predators.
Which of the following is true for exergonic reactions?
a. A net input of energy is necessary for the reaction to proceed. b. The products have less free energy than the reactants. c. The products have more free energy than the reactants. d. The reactants will always be completely converted to products. e. The entropy of the system is reduced.
When using a cladistic approach to building phylogenies, which of the following is considered most important for classification?
A) shared primitive characters B) analogous primitive characters C) shared derived characters D) the number of homoplasies E) overall phenotypic similarity
To crack the genetic code, researchers introduced synthetic messenger RNAs into in vitro translation systems and determined which proteins were produced from these synthetic mRNAs. mRNAs consisting of poly-UUC led to production of three different proteins: poly-Phe, poly-Ser, and poly-Leu. What best explains this result?
A. Each codon codes for several different amino acids. B. Each amino acid is specified by several codons. C. Transcription started at three different places. D. The synthetic mRNA was read in all three reading frames.