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
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.
Which of the following terms is the study of an
organism’s function? a. cytology b. anatomy c. psychology d. physiology e. endocrinology