Membrane structure. "Head" - phosphate group (polar)
A) Hydrophilic
B) Hydrophobic
A) Hydrophilic
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In radishes, two incompletely dominant genes
control color and shape. Red and white radishes are homozygous, whereas the hybrid is purple. Long and round are homozygous and, if crossed, will produce an oval hybrid. Give the F2 genotypic and phenotypic ratio produced by crossing pure-breed red long radishes with white round varieties. What will be an ideal response?
Respond to statements 151–155 in reference to the five animal
phyla listed below. a. Annelida b. Arthropoda c. Mollusca d. Echinodermata e. Rotifera D 151. Trilobites were members of this phylum. M 152. The larval stage in this phylum has bilateral symmetry, whereas the adult stage exhibits radial symmetry. M 153. Although most members are enclosed by hardened shells, this phylum name literally means “soft body.” E 154. This phylum has the greatest number of species. D 155. “Wheel animals” are in this phylum.
Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. The vast majority of uranium found on Earth is in the form of uranium-238, an isotope with a mass number of 238, while the uranium that is used for nuclear reactors and weapons is uranium-235, an isotope with a mass number of 235. What is the atomic difference between uranium-235 and uranium-238?
A. uranium-235 has three fewer protons than uranium-238 B. uranium-235 has three fewer neutrons than uranium-238. C. uranium-235 has three fewer electrons than uranium-238. D. uranium-235 has three fewer atoms than uranium-238.
Which of the following is a case of parent-offspring conflict?
a. any amount of brood care that reduces a parent's direct fitness b. any brood care that maximizes an offspring's inclusive fitness c. any diversion of brood care from present to future offspring d. none of the above