During fertilization, several sperm penetrate the corona radiata.
Answer the following statement true (T) or false (F)
True
Several sperm do penetrate the corona radiata, but only one penetrates the zona pellucida.
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What is the function of the MutS protein in methyl-directed mismatch repair?
A. To excise the mismatched basepair. B. To find mismatches. C. To directly bind the DNA polymerase. D. To make a cut in the nonmethylated DNA strand. E. To digest the nonmethylated DNA strand.
One cell sends second messengers to another cell through gap junctions. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
Interneurons are found in the
a. dorsal root. b. spinal cord. c. sensory neurons. d. motor neurons. e. somatic system.
When cyclin binds Cdk,
a. the cell transitions from G2 to S. b. kinase activation occurs. c. chromosomes condense. d. the cell quickly enters M phase. e. the cell begins apoptosis.