Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage.
2. Very great differences in body form can result from only small differences of gene expression.
3. Radiata have neither an anterior end nor a posterior end.
4. All eumetazoans have cell junctions.
5. Gastrulation is brought about by an invagination of the wall of the blastocoel.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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A nucleic acid contains uracil, allowing you to conclude that:
A. this nucleic acid is DNA. B. this nucleic acid is RNA. C. this nucleic acid could be either DNA or RNA.
Xanthophyll is a pigment found in plants that helps protect the photosynthetic protein D 1 from:
A. water reactions B. chlorophyll C. damage by high temperatures D. damage by excess light energy E. membranes
Many flowers growing in a cluster along a stem are known as
A. an inflorescence. B. a perfect flower. C. a bouquet. D. a complete flower. E. a pistil.
Which of the following factors does not affect the efficiency of a germicide?
A) how the object is used B) what infectious agents are most likely present C) the number of microbes to be killed D) the presence of excessive organic substances like blood, soil, or fecal matter E) the presence of excessive inorganic substances like minerals and salts in hard water