Exam 3 Yellow slides ch. 15-17

Why microscopy tech. Improvement in late 1800s set stage for modern genetics?

Allow study of meiosis and mitosis, revealing parallel behaviors of Mendelian concept and movement of chromosomes

Morgan and colleagues worked out set of symbols to represent fly genotypes. Represented by:

Wt (wild type) or W (mutant) on X chromosome

the following results from Griffith's experiment is example of transformation:

Mouse dies after being injected with mixture of heat-killed S and living R cells

Double strand DNA molecule shown to have 22% guanine base. What expected percentage of adenine base in molecule?

28% (g=22% so c=22%→ 44%) (100-44=46 / two = 28)

Nitrogenous bases paired in specific combos. Following does not provide evidence to support this conclusion:

Pairs of nitrogenous bases held together by hydrogen bonds . - true but not associated with pairing -

Who conducted X-ray diffusion studies that were key to discovery of structure of DNA?

Franklin

How do leading and lagging strands differ?

Leading strand synthesized in same direction as movement of replication fork; lagging strand synthesized in opposite direction

Enzyme does gamete-producing cell include that compensate for replication-associated shorting?

Telomerase

Extra credit!!!!! Telomeres, ends of linear chromosomes, have special structure and function, even though they are noncoding

Structure: TTAGGG and located at ends of linear chromosomes in eukaryotic cell. Function: protect ends of chromosomes from recognized as break and acts as buffer allowing loss without affecting coding

True of heterochromatin but not euchromatin:

It remains coiled at G1 phase

Template strand of given gene is: 3'-GCCACGTATCAG-5’ . What is sequence of nontemplate strand?

5’-CGGTGCATAGT-3’

What can be final product of expressed gene?

Polypeptide ( =protein)

Example of gene expression

Mouse fur color results from pigment formed by gene-encoded enzyme

Ability of genes term one spares to be expressed in a different species is possible because of _ property

Near university of genetic code

Which process (1, 2, or 3) does RNA polymerase bind to promoter, is the RNA transcript released, and is the RNA transcript extended?

1; 3; 2

components that doesn't form part of transcription complex at a enkaryotics promoter:

Transfer RNA (involved in translation)

Following is not modification made to eukaryotic mRNA before it goes to the cytosol:

spliceosomes are removed

Following incorrectly identified in figure:

(C) Amino acid attachment site