During gastrulation in frog embryos, fibronectin provides
A) an extracellular anchorage for migrating cells.
B) regulates actin-myosin interactions in the cytosol of migrating cells.
C) reduces the entry of calcium ions into migrating cells.
D) regulates mRNA movement out of the nucleus of a moving cell.
E) the pigment that accumulates in the primitive streak
Answer: A) an extracellular anchorage for migrating cells.
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Human diploid cells have ____ chromosomes while human gametes have ____ chromosomes
a. 46; 23 b. 23; 46 c. 96; 48 d. 48; 96
e. 46; 92In the part of an embryo sac farthest away from the micropyle you should find
a. the central cell. b. a seed. c. the pollen tube. d. synergids. e. antipodal cells.
Pigs have digitigrade locomotion because they walk on
a. their ankles. b. the soles of their feet. c. the tips of their toes, which are modified as hooves. d. their hands and knees.
Which of the following taxa would be the least inclusive?
a. genus b. family c. phylum d. order e. class