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

Biology & Microbiology

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Which of the following statements about the causes of extinction are true? Check all that apply.  

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Biology & Microbiology

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

Biology & Microbiology

Someone who is heterozygous for a recessive genetic illness is said to be ________

A) a carrier B) pleiotropic C) epistatic D) allelic

Biology & Microbiology

In the human pulmonary circuit, blood passes through which of the following?

A. Liver B. Limbs C. Lungs D. Digestive organs E. Brain

Biology & Microbiology