In the Watson–Crick model of DNA structure, the polynucleotide chains ____
a. are of unequal length
b. are arranged with the bases forming the backbone of the helix
c. form covalent bonds between uracil and adenine
d. are oriented in the same direction
e. are oriented in opposite directions
e
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When undergoing strength training, the number of _____ in each _____ undergoes a/an _____.
A. myofibrils, muscle fiber, decrease B. myofibrils, muscle fiber, increase C. sarcomeres, myofibril, decrease D. muscle fibers, muscle, increase E. motor units, muscle, increase
Put these developmental stages in the proper order
a. blastula ? gastrula ? morula b. blastula ? morula ? gastrula c. gastrula ? blastula ? morula d. morula ? blastula ? gastrula e. morula ? gastrula ? blastula
Some plants require water for reproduction. This is because
a. it is needed for germination of the spores. b. the eggs would dry out otherwise. c. the sperm are motile and need to swim to the egg to accomplish fertilization. d. the plants must be actively growing in order to reproduce. e. the seeds will be carried on the water to new sites.
For a non-polar receptor to enter the nucleus, all that has to happen is that the chaperone falls off the receptor.
a. true b. false