Cells Chapter 3/part 3
Terms
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- An RNA molecule consists of how many strands of nucleotides?
- one
- A DNA molecule consists of how many stands of nucleotides?
- two
- What are the uprights on the spiral ladder?
- nucleoties
- The sequence of N-Bases form _________ of ladder: Genetic Code.
- rungs
- Genetic code for one protein?
- Gene
- A double strand (helix) of nucleotides that is the genetic code in the chromomes of cells ?
- DNA
- A gene is the sequence of bases that is the code for one protein?
- DNA
- A single strand of nucleoties formed as a complementary copy of a gene in the DNA is?
- mRNA (messenger RNA)
- Contains the triplet code: three bases is the code for one amino acid ?
- mRNA (messenger RNA)
- __________ leaves the DNA in the nucleus, enters the cytoplasm of the cell, and becomes attached to ribosomes.
- mRNA (messenger RNA)
- The cell organelles that are the site of protein synthesis?
- Ribosomes
- ___________ attach the mRNA molecule.
- Ribosomes
- ___________ contain enzymes to form peptides bonds between the amino acids.
- Ribosomes
- _____________________ picks up amino acids (from food) in the cytoplasm and transports them to their proper sites(triplets) along the mRNA molecule.
- tRNA (transfer RNA)
- A protein is made of the smaller molecules called ___________.
- amino acids
- Two identical cells are produced in the process in what cell division?
- Mitosis
- One cell with the diploid (the usual # 46)number of chromosomes divides ONCE?
- Mitosis
- Four cells are produced in the process in what cell division?
- Meiosis
- One cell with the diploid (usual # 46)number of chromosomes divides twice?
- Meiosis
- Each cell produced has the haploid (usual # 46) number of chromosomes?
- Meiosis
- The cells produced are egg or sperm cells?
- Meiosis
- The cells produced are needed for the growth and repair of tissues?
- Mitosis
- Each cell produced has the diploid(usual # 46) number of chromosomes?
- Meiosis
- Genetic disease - a mistake in the ___________ code.
- DNA
- Uncontrolled cell division means __________ cell division.
- Abnormal
- Haploid number means:
- Half the usual number (23)
- In abnormal cell division, _______ does not when when contact is made to normal cells.
- Mitosis
- Mutation means:
- Genetic change, causes malignant cell.
- Environmental substances that cause mutations are called:
- Carcinogens; cigarette smoke, ultraviolet light, certain viruses.
- __________________ is a hereditary disorder, one that may be passed from generation to generation.
- A genetic disease