If a female orchid bee has just left a Brazil nut tree with nectar in her stomach, and if she visits another flower on a different Brazil nut tree, what is the sequence in which the following events should occur?
1. double fertilization
2. pollen tube emerges from pollen grain
3. pollen tube enters micropyle
4. pollination
A) 4, 2, 3, 1
B) 4, 3, 2, 1
C) 2, 4, 3, 1
D) 2, 4, 1, 3
A
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Migration is going to have what kind of effect on the genetic variation between populations?
A. decrease variation B. increase variation C. will not affect variation D. maintain variation
_____________ models are more consistent with the facts of body-weight regulation than are set-point models
Fill in the blank(s) with the appropriate word(s).
Which of the following is an INCORRECT pairing?
A) protozoa; multicellular B) fungi; cell walls C) algae; aquatic and marine habitats D) prokaryotes; no nuclei E) viruses; acellular parasites
Drosophila melanogaster is a/an __________. This type of animal is the most abundant of all animal species, making it an appropriate choice as an experimental model
(a) insect (b) bird (c) amphibian (d) mammal