What brain region plays an essential role in the formation of declarative memories?
a. cerebrum
b. cerebellum
c. hippocampus
d. thalamus
e. hypothalamus
c
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Pyrimidines and purines can exist in alternate forms, or tautomers, shown here. Under common cellular conditions (physiological pH) the most common form of each purine or pyrimidine is shown on the left, and the rare tautomer on the right
Tautomers differ in the placement of hydrogen atoms and double bonds. Consider cytosine and its tautomer, the rare imino form of cytosine. With which nitrogenous base will the imino form of cytosine most likely base pair in a double stranded DNA? A. adenine B. cytosine C. guanine D. thymine E. uracil
Describe the ways in which cell membranes are semipermeable.
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. Tiktaalik is an important fossil for the understanding of phylogeny because it is an intermediate form between fish and amphibians. 2. The formation of feathers, hair, and reptilian scales is based on completely different developmental patterns and genetic influences. 3. The first truly bipedal primates were the australopithecines. 4. Our species, Homo sapiens, had been in existence for approximately 1,40,000 years when it moved out of Africa and replaced Homo neanderthalis, another species of human, about 30,000 years ago.
Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was
A. polysaccharide. B. RNA. C. protein. D. DNA. E. lipid.