15) 15) If adenine makes up 20% of the bases in a DNA double helix, what percent
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15) 15) If adenine makes up 20% of the bases in a DNA double helix, what percent of the bases are guanine? A)40% B)60% C)80% D)30% E)20% 16) 16) RNA contains the nitrogenous baseinstead of which is only found in DNA A) cytosine... guanine B) a deoxyribose sugar... a ribose sugar C) nucleotides...nucleic acids D) uracil... thymine E) adenine. guanine 17) 17) After replication, A) each new DNA double helix consists of two new strands B) each new DNA double helix consists of one old strand and one new strand C) each new DNA double helix consists of two old strands D) each new DNA double helix contains 25% of the old DNA double helix E) one new DNA double helix consists of two old strands and the other new DNA double helix consists of two new strands 18) How many amino acids are common to all living systens? 15) A) 10 B) 20 C) 30 D) 100 E) 1000 19) The shared genetic code of all life on Earth is evidence that 19) A) bacterial cells arose earlier than eukaryotic cells B) the genetic code arose relatively late in the history of life on Earth C) all life shares a common ancestry D) life was created by a deity E) DNA replication is error-free 20) Di promotcrs 20) The expressed (coding) regions of eukaryotic genes are called A) introns B) caps C) exons D) promoters E)tails 21) to 21) Translation converts the information stored in A) protein...DNA B) DNA...RNA C) DNA...a polypeptide D) RNA... DNA E) RNA..a polypeptide For the following questions, match the key event of meiosis with the stages listed below I Prophase I V Prophase I III. Anaphase I N. Telophase I VIL Anaphase Il VIl. Telophase B 27) 22) Tetrads of chromosomes are aligned at the of the spindle alignment detenmine A) I c) IVExplanation / Answer
15-
In double-stranded DNA total percentage of the base pair is 100%.
Adenine pairs with Thymine. So the percentage of Adenine is equal to thymine percentage.
Guanine pair with Cytosine. So the percentage of Guanine is equal to Cytosine percentage.
A=T
C+G = 100 -A+T
So C+G = 60%
SO Guanine =30%
SO answer is option D.
16- RNA has Ribose sugar instead of deoxyribose sugar and It has Uracil nitrogen base instead of Thymine base.
So the answer is the option -D
17- DNA replication is semi-conservative. That means, one of the strands is old strand and one strand is the newly synthesized strand.
SO answer is the option - B.
18 - There are 20 amino acids that are common in all the proteins that are found in all organisms.
So the answer is an option B- 20.
19 - All the organism has the same set of the codon which codes for same amino acids which shows that all organisms share ancestry.
SO answer is option C>
20 - Translation is a process in which mRNA language is converted into the language of protein.
So the answer is option E.
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