Typical animal embryos have a(n) ________, or external cell layer, and a(n) ________, which lines the digestive tract
A) ectoderm; blastula
B) ectoderm; endoderm
C) endoderm; ectoderm
D) mesoderm; gastrula
Answer: B
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If nondisjunction occurs during meiosis I, ____
a. two gametes will be normal and two will be missing one chromosome b. two gametes will be normal and two will have one extra chromosome c. three gametes will be normal and one will have two extra chromosomes d. all gametes will be normal e. all gametes will be abnormal
A colorless substrate acted on by the enzyme portion of the ligand to produce a colored product is known as a/an ________.
A. antibody B. serotype C. chromogen D. antigen
Which of the following is not a derivative of cholesterol is
a. vitamin D b. bile salts c. estrogen d. testosterone e. amino acid
Which of the following statements about mimicry are true? (Check all that apply.)A) Generally, the number of mimics in a Müllerian mimicry system must be less than the number of modelsB) Only Batesian mimicry depends on the ability of the predator to learn.C) In Müllerian mimicry, the participants are both mimics and models.D) In Batesian mimicry, the participants are either mimics or models.E) A Müllerian mimic is "a sheep in wolf's clothing."
What will be an ideal response?