True or false: In the sequence AGGCCT, an available phosphate group would be found at the 5' end of the nucleotide labeled "T."
A. true B. false
Answer: B
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Prezygotic mechanisms lead to reproductive isolation by preventing the formation of
A. mating pairs. B. fertile eggs. C. fertile sperm or pollen cells. D. somatic cells. E. hybrid zygotes.
In a frog in which the diploid number of chromosomes per cell is 24, what is the total number of chromatids present
per cell in prophase II after the first division and cytokinesis?
a. 0 b. 6 c. 12 d. 24 e. 48
Which statement is characteristic of endocrine glands?
a. They release chemical signals into synapses. b. They produce chemical signals that are always stimulatory. c. They are controlled by only negative feedback mechanisms. d. They secrete chemical signals in small amounts over short periods of time. e. Their activity is limited to brain tissue.
Identify the distinguishing characteristics of phylum Cnidaria. Also identify the classes within this
phylum and their identifying characteristics. Include at least one representative for each class that you identify. What will be an ideal response?