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
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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
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.
Which of the following are capable of converting light energy to chemical energy?
a. chloroplasts b. mitochondria c. leucoplasts d. peroxisomes e. Golgi bodies
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