All of the following adaptations prevent dehydration in land plants EXCEPT
(A) many guard cells in the flaccid condition
(B) many stomates on the top leaf surface
(C) water-resistant cuticle
(D) the presence of many epidermal hairs
(E) recessed stomates
Ans: (B) many stomates on the top leaf surface
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When does the small ribosomal subunit bind to the translational complex in eukaryotic cells?
A. It is the first component to bind to the mRNA B. After the initiator tRNA binds, but before the start codon has been found C. After the large ribosomal subunit binds, but before the initiator tRNA binds D. After the start codon has been found by initiator tRNA E. The small ribosomal subunit binds the initiator tRNA and this complex is the first to bind to the mRNA
One feature of "engineered" plasmids that is helpful in the isolation and analysis of cloned DNA is:
a. they can only handle DNA fragments of up to 10 kb. b. that they are an integral part of all eukaryotic cells. c. they contain no genetic material of their own so that the cloned fragment is truly isolated. d. the presence of genes that allow transformed cells to survive on different media. e. the base sequence of one strand reads the same asits complement
B and T cells are called lymphocytes
a. true b. false
The activation of the parasympathetic branch of the autonomic nervous system is associated with _____
A) resting and digesting B) release of epinephrine into the blood C) increased metabolic rate D) intensive aerobic exercise