Brain tumors in children are very common in the cerebellum. Which symptoms might lead a doctor to suspect this
type of tumor?
a. difficulty hearing
b. difficulty seeing
c. difficulty walking
d. forgetting previously learned skills
e. suddenly starting to speak in gibberish
ANSWER: c
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Sexual dimorphism, as seen in the crayfish, is
(a) the presence of male and female individuals. (b) the production of eggs and sperm by the same individual. (c) another term for copulation. (d) the presence of observable differences between males and females.
A nucleotide is composed of at least one sugar, one phosphate group, and ____
a. one nitrogen-containing base b. one amino acid c. multiple cholesterol molecules d. fatty acid chains e. ATP
The most common molecules in cellular membranes are the
a. glycolipids. b. phospholipids. c. cholesterol molecules. d. proteins.
The neutral theory can be explained because:
a. the genetic code is redundant. b. in eukaryotes, much of the genome is noncoding. c. many genes are no longer functional. d. many nonsynonymous mutations do not impact the phenotype. e. All of the above.