The outermost layer of the stele is the pericycle. Indicate whether the statement is true or false
True
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The following is a list of events that were involved in the formation of self-replicating living cells. Which one of the following best represents the order in which these events are believed to have occurred?
1. formation of RNA 2. enclosure of small organic molecules within a membrane 3. formation of simple organic molecules from atmospheric gases 4. formation of a lipid-protein membrane A) 3, 1, 4, 2 B) 3, 4, 2, 1 C) 4, 2, 3, 1 D) 4, 1, 3, 2 E) 1, 3, 4, 2
Mutational "hot spots" in human DNA
a. always occur in genes that are transcribed. b. are common at cytosines that have been modified to 5?-methylcytosine. c. involve long stretches of nucleotides. d. occur only where there are long repeats. e. are very rare in genes that code for proteins.
Which gland requires the element iodine to produce its hormones?
A) thyroid B) pineal C) anterior pituitary D) ovary
Diploid (2n) means having
A. the somatic cells have all chromosomes except the sex chromosomes. B. a single set of chromosomes not having homologous pairs. C. both the allele and the autosome form of chromosomes. D. two complete sets of homologous chromosomes. E. one complete set of chromosomes in each gamete.