Which structure is formed by convergent extension movements?
Anonymous Poll
36%
Primitive streak
32%
Neural crest
22%
Blastocoel
10%
Amniotic sac
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Which part of the blastocyst forms the embryo proper in mammals?
Anonymous Poll
45%
Inner cell mass
26%
Trophoblast
19%
Blastocoel
9%
Zona pellucida
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What is the role of cadherins during neural tube formation ?
Anonymous Poll
14%
Cell migration
55%
Cell adhesion
26%
Morphogen gradient establishment
5%
Tissue apoptosis
π10
Which gene is primarily responsible for the regulation of the body plan in Drosophila embryos?
Anonymous Poll
49%
Hox genes
15%
Pax genes
16%
MyoD genes
20%
Wnt genes
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Which of the following is an example of a keystone species?
Anonymous Poll
40%
Wolves in Yellowstone
21%
Deer in forests
29%
Grasses in savannas
11%
Ants in rainforests
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Dinoflagellates are responsible for which phenomenon in marine environments?
Anonymous Poll
22%
Coral bleaching
33%
Red tides
22%
Ocean acidification
23%
Bioluminescence
π7
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The biodiversity hotspot concept was introduced by:
Anonymous Poll
15%
Charles Darwin
26%
Norman Myers
35%
Alexander von Humboldt
24%
Ernst Mayr
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Which type of genetic interaction leads to the masking of one gene's effect by another?
Anonymous Poll
14%
Codominance
18%
Pleiotropy
60%
Epistasis
8%
Multiple alleles
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Which part of the nephron is primarily responsible for the reabsorption of water?
Anonymous Poll
32%
Proximal convoluted tubule
31%
Loop of Henle
28%
Distal convoluted tubule
10%
Collecting duct
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Which of the following is an example of a "direct life cycle" in parasites ?
Anonymous Poll
47%
Malaria parasite
17%
Hookworm
20%
Tape worm
17%
Plague bacterium
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Which cells are responsible for the production of antibodies ?
Anonymous Poll
28%
T cells
62%
B cells
8%
Macrophages
2%
Dendritic cells
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The most intellectually fertile period of a human being is ..........
Anonymous Poll
9%
Childhood
56%
Adolescence
33%
Adulthood
2%
Old age
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Which type of herbivore primarily feeds on the leaves of plants ?
Anonymous Poll
16%
Frugivore
43%
Folivore
29%
Granivore
12%
Nectarivore
π12β€1
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Which fluorescent dye is commonly used for staining DNA in gel electrophoresis ?
Which fluorescent dye is commonly used for staining DNA in gel electrophoresis ?
Anonymous Poll
11%
Coomassie Blue
17%
Crystal Violet
70%
Ethidium Bromide
3%
Malachite Green
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In the MAP kinase pathway, what activates the MAP kinase (ERK) protein ?
In the MAP kinase pathway, what activates the MAP kinase (ERK) protein ?
Anonymous Poll
51%
Ras protein
21%
G-protein
23%
Adenylyl cyclase
5%
Calcium ions
π8
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In humans, the XX-XY system of sex determination was discovered by:
In humans, the XX-XY system of sex determination was discovered by:
Anonymous Poll
15%
Nettie Stevens
59%
Morgan
14%
Mendel
11%
Calvin Bridges
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A relationship where two species evolve in response to each otherβs adaptations is called:
A relationship where two species evolve in response to each otherβs adaptations is called:
Anonymous Poll
59%
Coevolution
15%
Divergent evolution
21%
Parallel evolution
4%
Independent evolution
π4β€1
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