DNA differs from RNA in that DNA
A) is single stranded.
B) contains deoxyribose.
C) is made up of nucleotides.
D) contains cytosine.
E) contains phosphates.
B
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Which cells are divided into two groups: T cells and B cells?
(A) macrophages (B) lymphocytes (C) platelets (D) complement cells
Which embryonic tissue is incorrectly
associated with its derivative? a. skin; mesoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; ectoderm
Which of the following terms is the study of an
organism’s function? a. cytology b. anatomy c. psychology d. physiology e. endocrinology
If something in the environment controls a population level and is uninfluenced by the population size, it is known as
A. a biotic factor. B. a density-dependent limiting factor. C. a density-independent limiting factor. D. None of these answers is true.