Restriction enzymes

A. cut only single-stranded DNA molecules.
B. can cut randomly along a double-stranded DNA molecule.
C. cut DNA molecules at specific sites.
D. cut only single-stranded RNA molecules.
E. function in DNA replication.


C

Biology & Microbiology

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Which of the following does not require expenditure of energy?  

A.  accumulation of ions inside a cell B.  transport against a concentration gradient C.  flow of sucrose and other carbohydrates once inside the sieve tubes D.  the loading and unloading of carbohydrates from the sieve tubes E.  opening or closing stomata

Biology & Microbiology

Growth from apical meristems, generally resulting in an increase in the length of a plant, is referred to

as

a. horizontal growth. b. typical growth. c. secondary growth. d. longitudinal growth. e. primary growth.

Biology & Microbiology

The main hypothesis about the origin of the first living organisms is called ________

A) chemo-evolution B) novel design C) biogenesis D) cytosynthesis

Biology & Microbiology

Much of the world's coal reserves were formed from the buried remains of the dominant plants of the Carboniferous period. What were the dominant plants of the period?

a. gymnosperms and angiosperms b. angiosperms only c. gymnosperms only d. seedless vascular plants

Biology & Microbiology