Nutrient-rich blood flows from the placenta to the fetus via the
a. ductus arteriosus.
b. fossa ovalis.
c. ductus venosus.
d. foramen ovale.
e. allantois.
C
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During mitosis the cytoplasm of the cell is settled down
a. true b. false
Considering only the steps that take place during translation, which of the following is not needed in order for translation to occur?
A) DNA template B) ribosomes C) tRNA D) sources of energy, including ATP
In a bird species, the amount of male brood care is positively correlated with offspring survival
A father's contribution is, however, completely unrelated to the amount of brood care his mature sons provide. What is the likely explanation for male brood care? a. intersexual selection via direct benefits b. sexual selection for good genes via an honest signal c. male response to environmental factors d. no sexual selection as there is no fitness consequence to male brood care
Which of the following statements is true?
(a) The mitotic spindle is largely made of intermediate filaments. (b) The contractile ring is made largely of microtubules and actin filaments. (c) The contractile ring divides the nucleus in two. (d) The mitotic spindle helps segregate the chromosomes to the two daughter cells.