What type of bonding holds together the complementary nitrogenous bases in DNA?

a. Hydrogen bonding
b. Phosphate-deoxyribose bonding
c. Ionic bonding
d. Covalent bonding


Ans: a. Hydrogen bonding

Biology & Microbiology

You might also like to view...

In a bacterium, we will find DNA in _____

A) a membrane-enclosed nucleus B) mitochondria C) the endoplasmic reticulum D) the nucleoid E) ribosomes Answer: D

Biology & Microbiology

What is the difference between Ras and the G proteins bound to G protein coupled receptors (GPCRs)?

A. Ras is an enzyme and the G proteins bound to GPCRs are not enzymes. B. Ras is a second messenger and the G proteins bound to GPCRs are not second messengers. C. Ras is a small G protein and the G proteins bound to GPCRs are not small G proteins. D. Ras can activate different effector molecules and the G proteins bound to GPCRs cannot activate different effector molecules.

Biology & Microbiology

Which of the following are capable of converting light energy to chemical energy?

a. chloroplasts b. mitochondria c. leucoplasts d. peroxisomes e. Golgi bodies

Biology & Microbiology

In Figure 40-3, the function of the structure labeled C, particularly in small children, is:

a. to produce blood cells. b. to act as a growth center. c. to provide mechanical strength. d. to serve as an attachment site for tendons. e. to nourish the bone tissue

Biology & Microbiology