Where does gas exchange occur in the mammalian lung?

A) Bronchioles B) Alveoli C) Bronchi D) The pharynx E) The trachea


B

Biology & Microbiology

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In eukaryotes, pre-mRNA processing may involve all of the following except  

A.  removal of exons from the pre-mRNA. B.  addition of a 5' cap. C.  addition of a 3' poly-A tail D.  pre-mRNA splicing by the spliceosome.

Biology & Microbiology

Gastrulation results in the formation of:

A. a bilaminar embryo consisting of the epiblast and the hypoblast. B. a trilaminar embryo consisting of the epiblast, the mesoblast, and the hypoblast. C. a gastrula consisting of a trilaminar embryo. D. a trilaminar embryo consisting of ectoderm, endoderm, and mesoderm. E. a bilaminar gastrula consisting of the epiblast and the hypoblast.

Biology & Microbiology

The lactose analog isopropyl-beta-D-thio-galactoside (IPTG) is often used to regulate gene expression systems in bacteria. IPTG does not act as a substrate for beta-galactosidase, but can bind to, and inactivate, the repressor. In this case, IPTG serves as a(n)

A. DNA-binding protein. B. inducer. C. operon. D. repressor.

Biology & Microbiology

Which of the following shows a brain structure correctly paired with one of its primary functions?

A) frontal lobe — decision making B) occipital lobe — control of skeletal muscles C) temporal lobe — visual processing D) occipital lobe — speech production

Biology & Microbiology