Triploblastic organisms give rise to ___ germ layers, which include _______
A. two; ectoderm and endoderm
B. two; endoderm and mesoderm
C. three; ectoderm, mesoderm, and
endoderm
D. three; ectoderm, metoderm, and
endoderm
C
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Which of the following statements about probes used in hybridization methods are true?
A. The probe could be a gene from another species. B. They are usually radiolabelled or conjugated with a fluorescent tag so they can be visualized. C. They can be synthetic DNA sequences based on known amino acid sequences. D. They can be based on DNA sequence information from a sequence database. E. All of these statements about hybridization probes are true.
Identify the ion from below.
A. Ca2+. B. He. C. H2. D. CO2. E. KCl-.
Nondisjunction may cause
A. Jacobs syndrome. B. Klinefelter syndrome. C. All of the answer choices are correct. D. trisomy 21. E. Turner syndrome.
The action of a white blood cell engulfing a bacterium is known as ____
a. pinocytosis only b. phagocytosis only c. exocytosis and phagocytosis d. endocytosis and pinocytosis e. phagocytosis and endocytosis