Multicellular eukaryotes arose about:a
3.8 billion years ago.
b. 2 billion years ago.
c. 1.3 billion years ago.
d. 600 million years ago.
e. 250 million years ago.
D
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The best conclusion concerning delta is that the cells _____
A) contain no DNA. B) contain no RNA. C) contain only one chromosome that is very short. D) are in the G0 phase. E) divide in the G1 phase.
HIV contains ____ as its genetic material
a. single stranded DNA b. double stranded DNA c. double stranded RNA d. single stranded RNA e. both DNA and RNA
The destruction of the ________ layer increases the amount of damaging UV light that reaches Earth's surface
Fill in the blank(s) with correct word
Which of the following is normally found at the 5' end of a DNA strand?
A. a phosphate group B. a hydrogen bond C. a hydroxyl group D. histones E. a methyl group