Which of the following is a characteristic of Nanos protein?
A. Throughout the first seven nuclear divisions, Nanos concentration is higher in the anterior pole than in the posterior pole.
B. Nanos represses Hunchback in the posterior pole.
C. Nanos is a transcriptional activator of many segmentation genes.
D. Nanos represses Caudal in the anterior pole.
B
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A cell in which viral reproduction occurs is called a:
A. host cell. B. daughter cell. C. sex cell. D. somatic cell. E. None of the answer options is correct.
Which of the following plants is not an annual?
a. corn b. geranium c. sunflower d. marigold e. carrot
As oxygen binds to hemoglobin, the ________ of the hemoglobin molecule will change through a process of ________ such that the binding of oxygen is enhanced.
A) amino acid sequence : phosphorylation B) cooperativity : negativity C) affinity : positive cooperativity D) affinity : negative cooperativity E) cooperativity : positivity
If it were possible to have antagonistic muscle pairs in an arm contract simultaneously, what movement would the arm make?
A) The arm would move away from the body. B) The arm would move toward the body in a curling movement. C) The arm would be locked in position. D) The arm could move easily in each direction.