White blood cells are produced
A. by mitotic division of other white blood cells.
B. from platelets.
C. from chondrocytes.
D. from bone marrow stem cells.
E. from plasma proteins.
D. from bone marrow stem cells.
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In this representation of transcription, strand #
2 represents
a. the coding DNA strand. b. the transcript. c. the template for the coding DNA strand. d. the coded RNA strand. e. both the transcript and the coded RNA strand.
In codominant inheritance, ____
a. there is partial phenotypic expression of one member of a gene pair in the homozygous condition b. there is full phenotypic expression of both members of a gene pair in the heterozygous condition c. the interaction of two or more non-allelic genes controls a single phenotype d. two recessive alleles interact and express themselves as a single dominant trait e. the phenotype of a heterozygote is intermediate to those of the parents
How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?
A. Contraction of the longitudinal muscles B. Contraction of the circular muscles C. Relaxing the chaetae (setae) D. Pulling on the chaetae (setae)
In order to stain flagella so that they may be readily observed by light microscopy, it is usually necessary to increase their thickness.
Answer the following statement true (T) or false (F)