________ diffuse(s) from fetal blood to maternal blood in the placenta
A) Alcohol
B) Oxygen
C) Infectious organisms
D) Wastes
E) Nutrients
D
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In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. Archenteron B. Neural tube C. Notochord D. Epidermis E. Intestinal tract
A gene that codes for a protein was removed from a eukaryotic cell and inserted into a prokaryotic cell. Although the gene was successfully transcribed and translated, it produced a different protein than it produced in the eukaryotic cell. What is the most likely explanation?
A. Eukaryotic genes often contain introns while prokaryotic genes do not. B. Eukaryotic transcripts have a 5' cap while prokaryotic transcripts do not. C. There are slight differences in the genetic code for prokaryotes and eukaryotes. D. Unlike eukaryotes, which have three different RNA polymerases, prokaryotes have a single RNA polymerase.
Why do electron microscopes have higher resolving power than light microscopes?
a. The fluorescent screen adds another magnification step. b. They are capable of producing 3-dimensional images, which light microscopes cannot do. c. Electrons have a smaller wavelength than visible light, leading to higher resolution. d. The copper grid used in electron microscopy provides enhanced resolution.
Under which condition are atoms most stable and least likely to bond with other atoms?
A) when their outermost electron shell is filled to capacity B) when their outermost electron shell has four or more vacancies C) when they have the same number of protons as electrons D) when they have a positive charge E) when they have a negative charge