Which cnidarian structures would be involved in mounting a defense against predation? Check all that apply.
A. cnidocytes.
B. gastrovascular cavity.
C. mesoglea.
D. nematocysts.
E. cnidocils.
Answer: E
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The nucleophile of the first step of spliceosome-mediated pre-mRNA splicing is the:
A. 2' hydroxyl of the branch point adenosine. B. 3' hydroxyl of a free guanine nucleotide. C. 3' hydroxyl of the 5' splice site exon. D. 2' hydroxyl of the 3' splice site intron.
This phylum of vascular, seed-bearing plants has about 185 known living species. Many of them look
like palm trees, and some produce massive strobili. Their male and female strobili are found on separate plants.
a. Cycadophyta b. Anthophyta c. Gnetophyta d. Coniferophyta e. Ginkgophyta
An atom with more protons than electrons is called a(n) __________. Fill in the blank(s) with the appropriate word(s)
Which of the following is NOT an assumption that has to be met to use the chi-square goodness of fit test?
A. The population is 5 times as large as the sample B. The expected value of the number of sample observations in each level of the variable is at least 5 C. The variable under study is categorical D. The sample method is simple random sampling