________ culture techniques are based on the expansion of the microenvironment to allow abundant growth of a microorganism formerly restricted to a small ecological niche.
Fill in the blank(s) with the appropriate word(s).
Enrichment
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An individual who is at risk of passing a genetic defect onto his or her offspring would most likely undergo ____
a. genetic testing b. genetic screening c. enzyme replacement therapy d. preimplantation genetic diagnosis (PGD) e. amniocentesis
Semiconservative DNA replication refers to the fact that _____
1.every A will be matched up with a T on the opposite strand 2.children inherit a mix of genes from both parents 3.the amount of A nucleotides always equals the amount of T nucleotides, and C nucleotides equal G nucleotides. 4.one strand of each parent DNA helix ends up in each new molecule
The by-product of the metabolism of cyanobacteria
that had the most effect on the further evolution of life is a. oxygen gas. b. carbon dioxide. c. water. d. nitrogen gas. e. hydrogen gas.
The antibiotic streptomycin inhibits protein synthesis in bacteria. If this antibiotic is added to a culture of animal cells, protein synthesis in the cytosol continues normally
However, over time, the population of mitochondria in the cell becomes depleted. Specifically, it is observed that the protein-synthesis machinery inside the mitochondria is inhibited. A. Explain this observation based on what you know about the origins of the modern eukaryote. B. What do you expect to observe if, in a new experiment, animal cells are treated with diphtheria toxin, a compound that is known to block cytosolic protein synthesis but does not have any impact on bacterial growth?