The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar.
b. uncharged and nonpolar.
c. basic and polar.
d. positively and negatively charged and nonpolar.
e. uncharged and polar.
B
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A selective medium contains one or more substances that inhibit growth of some microbes to facilitate the growth of other desired microbes.
Answer the following statement true (T) or false (F)
Which of the following choices represents the complete sequence of events relating to meiosis?
a. cell division, DNA replication, cell division b. DNA replication, cell division, DNA replication, cell division c. DNA replication, cell division, cell division d. DNA replication, cell division
A seed is a _____
a. female gametophyte c. mature pollen grain b. mature ovule d. modified microspore
Answer the following questions true (T) or false (F)
1. If an Rh-positive woman marries an Rh-negative man, their children are at risk for hemolytic disease of the newborn. 2. Infection with certain viruses may lead to the development of type I diabetes. 3. Depletion of the helper T cell population by HIV results in the development of AIDS.