The trend toward increased mobility of the world populations will probably lead to
A. increased allele frequency differences among populations.
B. decreased allele frequency differences among populations.
C. a decrease in mutation rate.
D. no change in allele frequency differences among populations because of selection.
E. none of these.
B
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Which of the following shows Chargaff's equivalence?
A) mRNA B) single-stranded DNA C) tRNA D) synthetic DNA (one strand all A, the other all T) E) all of the above
Biological evolution according to Darwin and Wallace states that
a. organisms produce numerous offspring, but environmental factors limit the number of reproducing survivors. b. heritable variations allow some individuals to outcompete others. c. the offspring of successful individuals inherit the favorable characteristics of their parents. d. a and b e. a, b, and c
Which group of adult tissues is derived from mesoderm?
a. lining of digestive tract, liver, pancreas b. muscles, bones, cartilage c. skin, brain, retina d. skin, liver, pancreas e. lining of respiratory tract, thyroid gland, urinary bladder
Which organelle are involved in energy conversion?
A. mitochondria and chloroplast B. mitochondria and ribosomes C. smooth and rough endoplasmic reticulum D. Golgi Apparatus and chloroplasts