In the cell cycle, cells can progress from G1 to S to G2, and to mitosis and cytokinesis. The timing of these events is controlled by which of the following?
a) cyclins b) cyclin-dependent protein kinases (Cdks) c) actin myofilaments d) centrosome e) cyclin-Cdk complexes
e) cyclin-Cdk complexes
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Describe the first obtained evidence for the existence of life in the deeper reaches of the ocean
What will be an ideal response?
Why does DNA synthesis only proceed in the 5? to 3? direction?
a. Because DNA polymerases can only add nucleotides to the 3? end of a polynucleotide strand. b. Because the 3? end of the polynucleotide molecule is more electronegative than the 5? end. c. Because that is the direction in which the two strands of DNA unzip. d. Because that is the only direction that the polymerase can be oriented. e. Because the chromosomes are always aligned in the 5? to 3? direction in the nucleus.
In the female, __________ stimulates follicle maturation
a. GnRH b. LH c. FSH d. estrogen e. progesterone
What is a target cell?
What will be an ideal response?