Unit 6 and 7 practice test
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- Which functions are served by cell division?
-
It allows surface area to keep up with the growing volume of an organism
-it replaces cells that wear out or are damaged
-it produces many types of cells that serve a variety of functions - Interphase is...
- The period between cell divisions
- During G1 and G2, cells synthesize...
- Proteins, RNA, and other macromolecules
- Adult cells that do not, or rarely, divide will be found primarily in what phase og the cell cycle?
- G0
- Transmission of hereditary information is associated with...
- chromosomes
- After normal miotic division, how many chromosomes does each offspring cell contain, as compaared to the parent cell?
- The same number
- In eukaryotic cells, when does chromosome replication occur?
- During interphase
- Watson anc Crick described the DNA molecule as a ...
- double-straded molecule
- What keeps the new nitrogen basees together after they attack to the old nitrogen bases?
- The hydrogen bonds between the nitrogen bases
-
Which of the following statements are true?
-all genes are alwasy expressed in all cel types
-Gene expression is random and occurs by chance
-Different cell types have different sets of genes
-Gene expression is controlled differently - -Gene expressions is controlled differently in specific cell types
- DNA controls protein synthesis by...
- encoding amino-acid sequence
- mRNA carries the genetic code of DNA because
- -the mRNA has a sequence exctly complementary to the DNA
- The sequence of nucleotides in a messenger RNA molecule (mRNA) is determined by the squence of nucleotides in a....
- DNA molecule
- The ribiosomes of a cell are sites for the synthesis of....
- ATP
-
Which compound is part of the structure of another compound that is listed:
-amino acids
-enzymes
-nucleic acids
-none of the above - Amino acids
- Which compounds are catalytic proteins
- Amino acids
- One type is abbreviated as DNA
- nucleic acids
- They act to change the rate of chemical reactions
- Enzymes
- One type is the carrier of hereitary information
- Nucleic acids
- How did scientists determine hat using a single and soble nitrogen bases for the coeds foramino acids would not be sufficient?
- Scientists knew that there were 20 different amino acids therefore at least 3 bases were needed
- Which molecule contains thymine?
- DNA molecules
- Which molecules are capable of duplicating themselves in plants and animals
- DNA molecules
- Which molecules are composed of a specific aminoacid sequence?
- Neither DNA nor RNA
- Three nucleotides, when taken together, represent a hereditary code (reference is made to)
- Both DNA and RNA
- The code alphabet seems to consist of 4 letters, or nucleotides (reference is made to)
- both DNA and RNA
- The functioning of the code occurs in the robosomes (reference is made to)
- RNA
- proteins are composed of amino acids (refverence is made to)
- neither DNA nor RNA
- The code is involved in protein synthesis (reference is made to)
- both DNA and RNA
- This molecule has the ability to duplicate itself (reference is made to)
- DNA
- The transfer type has a singe code word (reference is made to)
- RNA
-
Of the folling molecules which one can bind to DNA sequences and control gene expression?
-Starches
-Sugars
-Lipids
-Proteins - proteins
- For what type of product does an intron code?
- no functional product
- The production of proteins is directde by the DNA beause it is the template for...
-
mRNA
tRNA
Ribosomse - During protein synthesis, the substnce that attaches to a particular amino-acid molecule and posistions it on a ribnosome is...
- tRNA
- The purpose of the signal sequence found in many proteins is...
- to identify proteins for transport to the endoplasmic reticulum and ecentually for transport to the site of function
- Male honeybees and desert whiptales are produced by female parents alone. What could one conclude about tehse offspring?>
- The offspring are genetically identical o their mothers
- The one form of reproduction found in each of the 5 kingdoms is...
- asexual reproduction
- The process whereby a part of a parent organism breaks away and develops into a new indivicual is referred to as...
- budding
- Sexual reproduction is a process by which
- nuclei of 2 sepreate cells fuse into 1
- What happenes during asexual reproduction?
- No chance in chromosome number
- What happens during gamete formation?
- A change from diploid to haploid
- What change happens to chrtomosome number during fertilization?
- a change from haploid to diploid
- Fertilization is accomplished when....
- the egg and sperm nuclei unite
- The polar bodies produced with the ovum evantually...
- remove excess genetic material then disinegrate
- In meiosis the chromosomes are replicated during...
- interphase
- it begins with duplicated chromosomesconsisting of jointed pairs of sister chromatids
- prophase I
- it begins with a pair of cells each containg a single set of chromosomes
- prophase II
- homologous chromosomes pair and cross over
- prophase I
- homologous chromosomes migrate to opposite poles of the dividing cell
- anaphase I
- This phase differens from a similar phase in mitosis in that no duplication of chromosomes begins it
- prophase I
- Immediatelyafter thisphase, sister chromatids line up in the cener of the dividing cell in preparation for separating
- prophase I
- If there are 2 cells each with the homologous pairs, what is represented?
- gametes
- Conjucation in unicellular eukaryotes is an example of...
- sexual reproduction
- Meiosis I in the human female is completed jsut before...
- ovulation
- Histones are
- nuclear proteins