Which of the following are present in high densities in both smooth and skeletal muscle cells? I) cilia II) mitochondria III) nuclei IV) endoplasmic reticulum
A) only I and II
B) only II and IV
C) only III and IV
D) only I, II, and III
B
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Which of the following does not affect the evolution of a group of organisms?
A. genetic drift B. mutation rates C. mating D. migration E. natural selection
Type II survivorship curves
a. are characteristics of humans and elephants. b. typify a population in which all ages have an equal chance of survival. c. indicate a high mortality rate in the very young. d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age. e. are typical of annual plants.
In mice, the gene for insulin-like growth factor is imprinted. During embryonic development, only the paternal allele for insulin-like growth factor is expressed. This means
A. that the paternal allele is imprinted. B. that the maternal allele is imprinted. C. that the paternal allele is mutated. D. that the paternal allele is hyper-methylated. E. that the maternal allele is expressed.
The backbone of a double helix is
A. sugar-phosphate. B. hydrogen bonds. C. base-pairing. D. All of these answers are true.