How many of the 13 essential vitamins are water soluble and how many are fat soluble?
a. 5 are water soluble, and 8 are fat soluble
b. 8 are water soluble, and 5 are fat soluble
c. 9 are water soluble, and 4 are fat soluble
d. 4 are water soluble, and 9 are fat soluble
Ans: c. 9 are water soluble, and 4 are fat soluble
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How can two cells in the same complex multicellular organism have different fates?
A. Different genes are activated and repressed in the two cells. B. Different DNA sequences are found in the nuclei of the two cells. C. Different amounts of DNA are found in the nuclei of the two cells. D. Different types of transcription and translation machinery are found in the two cells. E. All of these options are correct.
When salt dissolves in water as illustrated in the figure above, the water molecules form ____ around
the Na+ and Cl? ions.
a. covalent bonds b. hydration layers c. nonpolar interactions d. membranes e. ionic bonds
Which adaptations originated in some fishes and enabled vertebrates to thrive on land?
A. limbs and lungs B. lungs C. fins D. limbs E. lungs and fins
Natural selection changes allele frequencies in populations because some __________ survive and reproduce more successfully than others.
A) alleles B) loci C) gene pools D) species E) individuals