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
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.
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
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
The first amino acid that initiates the eukaryotic polypeptide is
a. any amino acid. b. glutamine. c. methionine. d. N-formylmethionine.