Craig Venter and Claire Fraser are working to create a "minimal organism.". They are starting with Mycoplasma genitalium, a bacterium that has 517 genes. By disabling its genes one at a time, they discovered that 265–350 of them code for essential proteins. The scientists are synthesizing the essential genes and inserting them, one by one, into an engineered cell consisting only of a plasma
membrane and cytoplasm. They want to see how few genes it takes to build a new life form. What properties would such a cell have to exhibit for you to conclude that it was alive?
What will be an ideal response?
These cells would have to contain genetic information to code for proteins, be able to obtain and process inputs for energy, engage in metabolic reactions, eliminate wastes, communicate and interact with its environment, and reproduce.
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In a prokaryotic operon, the region to which RNA polymerase binds is called
a. the heterogeneous nuclear DNA. b. the repressor gene. c. the promoter sequence. d. the operator sequence. e. all enhancer gene.
A recessive trait that is inherited through complete dominance can occur only if both parents are heterozygous for the trait
Indicate whether the statement is true or false
All of the following are examples of mechanoreceptors EXCEPT
A) Pacinian corpuscles. B) Ruffini corpuscles. C) stretch receptors. D) Meissner's corpuscles. E) olfactory receptors.
Vascular leakages (i.e., bleeding for every orifice) observed in Ebola patient is a result of:
a) Pro-cytokines only affecting endothelial cells b) Pro-inflammatory cytokines and Ebola replication in endothelial cells c) Immune-suppressive cytokines and Ebola replication in monocytes d) Immune-suppressive cytokines and Ebola replication in endothelial cells