A hydrogen bond between the amino acid side groups (R groups) of two different polypeptide chains in a multichain
protein would be considered part of the ____ structure of the protein.
a. primary
b. secondary
c. tertiary
d. quaternary
e. linear
ANSWER: d
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Reproductive isolating mechanisms are divided into categories based on when they act. ____ isolating factors prevent fertilization from taking place; ____ isolating factors result in failure of the fertilized egg to develop into a fertile individual
Fill in the blank with the appropriate word.
What is the composition of the tunic that covers the outer body of urochordates?
a. protein b. calcium c. carbohydrate d. cholesterol
The number of new cases of a disease in a population over a specific period of time compared with the healthy population is the ________.
A. epidemic rate B. mortality rate C. incidence rate D. morbidity rate E. prevalence rate
Which is an example of a density-independent factor on a population?
A. Weather B. Amount of prey C. Intraspecific competition D. Nesting sites E. Predation