If you were observing an early stage in human development at which endoderm, mesoderm, and ectoderm had just formed, you would be looking at a
A. zygote.
B. gastrula.
C. embryonic stage.
D. morula.
E. fetal stage.
B. gastrula.
Biology & Microbiology
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If damaged DNA is detected and cannot be repaired, which protein can trigger apoptosis?
a. retinoblastoma proteins (Rb) b. cyclin-dependent kinase (Cdk) c. p53 d. p21
Biology & Microbiology
Which of the following is a diploblast?
a. A comb jelly b. A goat c. A spider d. An octopus
Biology & Microbiology
The letter “B” in the above figure represents
a. transverse. b. radial. c. tangential. d. elliptical. e. obtuse.
Biology & Microbiology
A cell that has neither a net gain of water nor a net loss of water when it is immersed in a solution must be
A) isotonic to its environment. B) hypertonic to its environment. C) hypotonic to its environment.
Biology & Microbiology