Gastrulation is brought about by an inward folding of the blastula.
Answer the following statement true (T) or false (F)
True
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Evolution at the genomic level involves changes in
A. chromosome structure and number. B. sequences of amino acids in proteins. C. sequences of nucleotides in RNA molecules. D. incorporation of new organelles such as the mitochondrion. E. DNA and histone relationships.
What happens when living R strain Streptococcus pneumoniae bacteria are mixed with heat-killed S
strain Streptococcus pneumoniae bacteria?
a. The S strain bacteria come back to life. b. The R strain bacteria are killed, and the S strain bacteria remain dead. c. The R strain bacteria are transformed into S strain bacteria. d. The S strain bacteria are transformed into R strain bacteria. e. The R strain bacteria are killed, and the S strain bacteria come back to life.
Nucleotides are monomers of
a. complex lipids. b. proteins. c. polysaccharides. d. nucleic acids. e. all of these.
Which of the following organisms is a multi-celled producer?
a. an oak tree b. Candida, a pathogenic fungus c. E. coli, a common intestinal bacterium d. a Siberian tiger e. an archaeon on the seafloor