16. Which of the following statements is/are TRUE regarding sex-linked humans? r
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16. Which of the following statements is/are TRUE regarding sex-linked humans? recessive traits or diseases in a. Females tend to show (exhibit) most sex-linked traits/diseases b. Males usually are "carriers" of the traits/diseases c. Sex-linked recessive traits/diseases usually "skip" a generation d. all of the above are true e. none of the above are true 17. Which of the following choices are parts of a nucleotide, the functional unit of nucleic acids? a. 5 carbon sugar b. phosphate group c. nitrogen base d. two of the above are parts of a nucleotide e. all of the above are parts of a nucleotide 18. Purines are a ring structure and include-and- a. single, A, C b, single, G, C c. double, A, G d. single, T,G e. double, C,T 19. Heterochromatin is about 25% of the genome and is considered "good" DNA because it codes for genes. a. True b. False 20. Who discovered the structure of DNA? ?Watson and Crick b. Franklin and Wilkins c. Hershey and chase d. two of the above research pairs e. all of the above research pairs 21. DNA replication is a bidirectional process. a. True b. False 22. During DNA replication, one "parental/maternal" molecule of DNA will give rise to two "daughter" molecules of DNA. Each daughter molecule is composed of one strand from the mother molecule and one new strand created from the mother molecule. This concept is why DNA replication is called... a. continuous b. conservative c. semiconservative d. discontinuous e. radicalExplanation / Answer
1) Which statement is True regarding sex-linked recessive traits or diseases in humans?
The correct answer is the option (E) None of the above are true
In sex-linked recessive traits, both parents chromosomes being affected equally.
2) Which of the following choices are parts of a nucleotide, the functional unit of nucleic acids?
The correct answer is the option (E) All of the above are parts of a nucleotide
When a nitrogenous base is linked to a pentose sugar, a nucleoside is formed. When a phosphate group is added to a nucleoside, a nucleotide is formed.
3) Purines are a double ring structure and include Adenine (A) and Guanine (G)
The correct answer is the option (C) double, A, G
4) Heterochromatin is about 25 % of the genome and is considered "good" DNA because it codes for genes
The correct answer is the option (B) False
Heterochromatin is inactive and has little or no transcriptional activity.
5) Who discovered the structure of DNA?
The correct answer is the option (A) Watson and Crick
Watson and Crick proposed the double helical model of DNA.
6) DNA replication is a bidirectional process.
The correct answer is the option (A) True
A replication fork moves in one direction opening fresh segments of DNA duplex for the replication process. But a single origin, two replication forks are formed and the two forks move in opposite directions. Therefore the replication process is bidirectional.
7) During DNA replication, one "parental/maternal" molecule of DNA will give rise to two "daughter" molecules of DNA. each daughter molecule is composed of one strand from the mother molecule and one new strand created from the mother molecule. This concept is why DNA replication is called...
The correct answer is the option (C) semiconservative
The parental DNA duplex is replicated to form two daughter duplexes, each of which consists of one old parental strand and one newly synthesized strand. This phenomenon is called semi-conservative replication.
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