How does a bacterial cell protect its own DNA from restriction enzymes?

A. by adding methyl groups to adenines and cytosines
B. by reinforcing bacterial DNA structure with covalent phosphodiester bonds
C. adding histones to protect the double-stranded DNA
D. by forming "sticky ends" of bacterial DNA to prevent the enzyme from attaching
E. using DNA ligase to seal the bacterial DNA into a closed circle


Ans: A. by adding methyl groups to adenines and cytosines

Biology & Microbiology

You might also like to view...

Which of the following occurs in the lightindependent

reactions of photosynthesis? a. Water is broken down. b. Glucose is produced. c. Oxygen is released. d. NADP+ is reduced. e. ATP is produced.

Biology & Microbiology

The energy released as ____ are broken drives ATP synthesis

a. phosphate groups b. the bonds of a sugar's carbon backbone c. hydrogen bonds of water d. ADP molecules e. cofactors

Biology & Microbiology

When the birth rate plus immigration equals

the death rate plus emigration the result is a. logistic growth. b. exponential growth. c. population saturation. d. zero population growth. e. geometric growth

Biology & Microbiology

The first amino acid that initiates the eukaryotic polypeptide is

a. any amino acid. b. glutamine. c. methionine. d. N-formylmethionine.

Biology & Microbiology