Which of the following structures is the smallest?
A) neuron
B) prokaryotic cell
C) protein
D) nucleus
E) eukaryotic cell
Answer: C) protein
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There are two types of pepper moths. The black morph is camouflaged against the dark bark of a bare tree. The light morph is difficult to detect on trees that are covered with lichen
Environmental conditions that support substantial lichen growth would result in selection for: A. the dark colored morph of the pepper moth B. the light colored morph of the pepper moth C. Moths do not eat lichen, so its growth would have no effect on selection for one color over the other. D. Color would not be selected for or against, but those moths that excrete chemicals to destroy the lichens would be selected for.
When is preimplantation diagnosis performed?
a. before in vitro fertilization takes place b. when the embryo has at least 100 cells c. when the embryo is at the 8 cell stage d. when the embryo becomes a fetus at 8 weeks e. shortly after birth
Ecology is a science that can be carried out by ________
A) learning via discovery B) having hypotheses that are then tested C) both A and B D) neither C nor D
An embryo having a blastodisc exhibits holoblastic cleavage. Indicate whether the statement is true or false