Fossil evidence indicates that prokaryotic cells first existed on the Earth
A) 350 years ago.
B) 3500 years ago.
C) 35000 years ago.
D) 3.5 billion years ago.
E) 3.5 × 1012 years ago.
D
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Which of the following statements about the causes of extinction are true? Check all that apply.
_____ Probability of extinction varies inversely with population size. _____ Ten 10-hectare habitat patches is not the same as one 100-hectare patch. _____ Habitat loss is currently the major cause of extinction. _____ The prehistoric megafauna of North America were spared from extinction because they coevolved with humans. _____ Probability of extinction is greatest for an endemic species.
A nucleosome is a combination of _______ and _______
A. histone proteins, scaffold proteins B. RNA, transcription proteins C. DNA, histone proteins D. RNA, histone proteins E. DNA, scaffold proteins
Someone who is heterozygous for a recessive genetic illness is said to be ________
A) a carrier B) pleiotropic C) epistatic D) allelic
In the human pulmonary circuit, blood passes through which of the following?
A. Liver B. Limbs C. Lungs D. Digestive organs E. Brain