Which of the following is responsible for closing off the airway during swallowing?
a. the larynx
b. the epiglottis
c. the pharynx
d. the intercostal muscles
Ans: b. the epiglottis
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The integrase enzyme of bacteriophage ? is required to:
A. excise the prophage from the host genome. B. degrade phage mRNA during lysogenic growth. C. bypass terminator structures downstream from the N and Cro genes. D. combine multiple DNA segments to make new genes.
In a typical eudicot seed, most of the nutrients are stored in ____
a. the seed coat b. endosperm c. cotyledons d. coleoptiles e. hypocotyls
Which of the following is characteristic of REM sleep?
a. dreaming b. stage of sleep that occurs every 3-4 hours c. most of sleep is spent in this stage d. easily aroused e. little change in muscle tone
In a cross between a true-breeding plant bearing smooth, yellow seeds and a true-breeding plant with
wrinkled, green seeds, the offspring were all smooth and yellow. What is the genotype of the F1 plants? A. SSYY B. ssyy C. SsYy D. ssYY E. SSyy