Each of five questions on a multiple-choice examination has four choices, only one of which is correct. The student is attempting to guess the answers. The random variable X is the number of questions answer correctly. Probability that the student will get

Exactly three correct answers

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#Question id: 10752

#Unit 10. Ecological Principles

Which of the following is an example of Batesian mimicry?

A) a butterfly that resembles a leaf

B) a nonvenomous larva of a moth that moves like a venomous snake

C) a fawn with fur coloring that camouflages it in the forest environment

D) a snapping turtle that uses its tongue to mimic a worm, thus attracting fish

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#Question id: 6943

#Unit 5. Developmental Biology

The portion of the blastoderm-stage embryo which will give rise to most ectodermal, mesodermal, and endodermal tissues is called the:

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#Question id: 23351

#General Aptitude

The biggest obstacle in the way of communication in a class is

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#Question id: 1278

#Unit 4. Cell Communication and Cell Signaling

Vertebrate gap junctions are composed of:

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#Question id: 11009

#Unit 7. System Physiology – Animal

What is the normal total delay of the cardiac impulse in the A-V node plus bundle?