Question

7. Your genes partly determine your physical characteristics, but the environment you live in also plays a role. a. True--Some genes can be altered by environmental features. b. False--Your genes completely determine your physical characteristics. c. Scientists aren't sure what determines an individual's characteristics d. False-The environment plays no role e. True-In fact the environment always alters genetic characteristics. 8. Choose the correct sequence starting with the smallest unit: a. DNA, gene, allele, chromosome, nucleotide b. Chromosome, gene, allele, nucleotide, DNA c. Gene, nucleotide, allele, DNA, chromosome d. Nucleotide, allele, gene, DNA, chromosome e. Nucleotides, DNA, allele, gene, chromosome 9. A DNA molecule is described as a "double helix," What does that mean? a. DNA molecules come in pairs. b. A DNA molecule is ladder-shaped and twice as wide as it is long. c. A DNA molecule doubles every time a cell uses it d. A DNA molecule is ladder shaped and twisted. e. A DNA molecule is shaped like a ladder crossing the cell nucleus 10. Complementary base pairing in DNA means that DNA is easy to copy. How does this work? a. The base pairs that make up the center of the DNA molecule will only match with identical copies of themselves A:A, C:C, etc. b. It doesn't work very well, so many mistakes are made when DNA gets copied as cells divide C. The base pairs that make up the center of the DNA molecule will only match up A with T or C with G. d. The base pairs that make up the center of the DNA molecule match other DNA molecules perfectly e. DNA isn't very easy to copy, but there's no need to do that, so it doesn't matter 11. There are four bases in DNA: adenine, thymine, guanine, and cytosine. How do they pair up? a. A-T and G C b. A-G and T-C c. T-G and A-C d. G-A and C-T e. It varies. 12. What are the three functions of the DNA molecule? a. Replicate, correct mistakes, produce proteins b. Replicate, mutate, build cells c. Reproduce offspring, mutate, produce proteins d. Replicate, mutate, produce proteins e. Reproduce, correct mistakes, produce new DNA 13. Scientists James Watson and Francis Crick determined the double helix structure of DNA. Why is that structure important in DNA replication? a. Because DNA is double, it's already evenly split, so it ends up being the same in every replicated cell. b. When the cell splits, the DNA is twisted together, so it doesn't easily come apart during replication c. When the DNA separates into two halves during replication, each half is a mirror image of the other, d. Because each base can only pair with a particular other base, even when the DNA splits, the bases e. The structure is like a ladder, so it's easy for new cellular material to "climb" the ladder to reform in a so the new halves fit right back together again in the new cell. will always match up the same way as it reforms. new cell. 14. DNA replicates mostly accurately due to consistent base-pairing. What does that mean? a. Every base in a paired DNA molecule is the same. b. When the base of a DNA molecule lines up with the base of another, they are always consistent. c. Base A always pairs with base C, and T with G, so accurate replication is easy d. Base A always pairs with base T, and C with G, so accurate replication is easy e. DNA actually mutates a lot, so replication isn't all that accurate 15. In a genetic disease like sickle c he difference between the normal hemoglobin, HbA, and the sickle cell hemoglobin, HbS, can be as minor as one different amino acid. True or false? a. True b. False

Answer 1

7. ans: A

The change in the person's characteristics like personality changes are primarily influenced by genetic, but it also partly occurs by the interaction and adaption to the social environment.

8. ans: B

Chromosome NA Bases Genes

Chromosomes comprises DNA. DNA consists of different genes in it. Alleles are specific form of gene. Neucleotides comprises base,sugar and phosphate groups. Neucleotides bind to each other and forms polyneuclotide which are the building blocks of DNA.