1. Both DNA and RNA are made of a. Amino acids b. Fatty acids c. Nucleotides d.
ID: 253588 • Letter: 1
Question
1. Both DNA and RNA are made of a. Amino acids b. Fatty acids c. Nucleotides d. Sugars A virus was analyzed for its base composition and found to contain 30% A, 20% T, 30% G, and 20% C. It genetic material must be a a. Double-stranded DNA b. Double-stranded RNA c. Single-stranded DNA d. Single-stranded RNA e. Can't be determined Which of the following is not true about C-value? a. C-value is the total DNA in a haploid genome b. C-value is positively related with the complexity of the organism c. C-value of human genome is 3X10 base pairs (bps) d. Each species has its own C-value Which of the followings did not contribute to the discovery of DNA double helix? a. Chargaffs ratio b. X-ray diffraction (or crystallography) studies c. Model building by Watson and Crick d. Electron microscopy Which of the followings is an example of facultative heterochromatin? 2. 3. 4. 5. a. Centromere b. Telomere c. Y-chromosome d. Barr body (the condensed x chromosome) 6. Two strands (polypeptide chains) in a DNA molecule are a. Identical b. Paralle c. Anti-parallel d. Held together by phosphodiester bonds Which of the followings about histone proteins is not true? 7. a. b. c. d. They are a part of the chromosome They bind to the DNA They are positively charged They are negatively chargedExplanation / Answer
Answer:
1). C. Nucleotides
Explanation:
Both DNA and RNA are nucleic acids that are made of nucleotides.
2). C. Single-stranded DNA
Explanation:
Thymine (T) is present only in DNA. Chargaff rule, total number of Thymine (T) is equal to total number of Adenine (A) and total number of Guanine (G) is equal to Cytosine (C). This Chargaff rule is applicable to double stranded nucleotides. But, total number of adenines are not equal to thymines. So the DNA is single stranded.
3). c-value is positively related with the complexity of the organism
Explanation:
The C value paradox is that the amount of DNA in a haploid genome (the 1C value) does not seem to correspond strongly to the complexity of an organism
4). D. Electron microscopy
5). C. Y-chromosome
6). C. anti-parallele
Explanation: Two strands are held together by hydrogen bonds and are anti-parallel. It means that one strand runs from 3’-5’ and complementary strand runs from 5’-3’.
7). D. They are negatively charged
Explanation:
Histones are positively charged proteins that wrap up DNA through interactions between their positive charges and the negative charges of DNA.
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