During the process of swallowing, ____
a. the esophagus is temporarily closed by the glottis
b. the epiglottis closes the trachea leading to the lungs
c. the pharynx restricts food entry to the esophagus
d. the epiglottis seals the esophagus
e. peristalsis begins in the pharynx
b
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In phototropism, shoots respond to ____ light
a. red b. green c. yellow
d. blue e. ultra-violet
Mutants that are lacIS do not produce lac enzymes, regardless of the presence or absence of lactose
Indicate whether the statement is true or false
Which of the following statements is true about a phylogeny, as represented by a phylogenetic tree?
I) Descendant groups (branches) from the same node do not necessarily share any derived characters. II) A monophyletic group can be properly based on convergent features. III) The ancestral group often has all the synapomorphies of the descendant species. A) only I B) only II C) only III D) None. Not I, II, or III.
In one experiment, mice were genetically engineered to overexpress a particular set of miRNAs. These animals developed lymphomas. The genes encoding these miRNAs were acting as _________.
a) tumor suppressors b) sex-linked dominant alleles c) holandric genes d) oncogenes