21.       Which of the following terms refers to RNA only? a.         Double helix b.         Thymine c.         Uracil d.         Cytosine e.         Guanine 22.       Codons...

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Biology

21.       Which of the followingterms refers to RNA only?

a.         Doublehelix

b.         Thymine

c.         Uracil

d.         Cytosine

e.         Guanine

22.       Codons are locatedon:

a.        Ribosomes                 d.         rRNA

b.        tRNA                          e.         DNA

c.         mRNA

23.       EcoR1 and HindIII are twodifferent restriction enzymes. If the DNAs of different organismsare cut as described below, which DNAs could NOT join together andbe permanently sealed?

a.      Human DNA cut with EcoR1/ chimpDNA cut with EcoR1

b.      Prokaryotic DNA cut withHindIII/ eukaryotic DNA cut with HindIII

c.      Mouse liver DNA cut with EcoR1/mouse kidney DNA cut with EcoR1

d.      Mouse DNA cut with HindIII/chimp DNA cut with HindIII

e.      Bacterial DNA cut with EcoR1/mouse DNA cut with HindIII

24.                  Organism                   Diploid Chromosome number

Crab                                       236

Human                                  46

SpiderLily                             46

Pea                                         14

Yeast  (fungus)                      12

The chromosome counts above support the idea that:

a.                    the more chromosomes a species has, the more complex it is.

b.                  the fewer chromosomes a species has, the more ancient itsevolutionary history.

c.                    all species have a unique chromosome number common only tothem.

d.                   species may differ from each other in chromosome number.

                      

27. Roundup-Ready â„¢ Soybeans are:

       a.    easierto harvest than other varieties.

       b.   resistant to insect attack.

       c.    higherin nutrition than other varieties.

       d.   resistant to a specific herbicide.

                                 e.         not usable infood products

28        Which of thefollowing organisms has the most chromosomes (DNA?)

           a.         a fruit fly

           b.         a human

           c.         a dog

           d.         a grassplant

           e.         you cannot tellwithout looking at cells.

                      29.       One species’ DNA differsfrom others in its _____.

           a          sugars

           b         phosphates

           c          basesequences

           d          all of theabove

                      30.       What are the base-pairingrules for DNA?

           a          A-G,T-C

           b          A-C,T-G

           c          A-U,C-G

           d          A-T,G-C

           e          either c ord

Answer & Explanation Solved by verified expert
3.6 Ratings (269 Votes)
21 c uracil Uracil is not present in DNA as nitrogenous base while it is present in RNA Thymine is usually not found in RNA Double helix is not present in RNA Although cytosine and guanine are    See Answer
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