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Last Bio Exam

Terms in this set (17)

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?
Centrosome
Which of the following are primarily responsible for cytokinesis in the plants cells but not in animal cells?
Golgi-derived vesicles
After which checkpoint is the cell first committed to continue the cell cycle through M?
G1
Which of these statements is false?
At sexual maturity, ovaries and testes produce diploid gametes by meiosis.
A cell divides to produce two daughter cells that are genetically different.
The statement is true for meiosis I only
Which of the following is an example of alternation of generations?
A diploid plant (sporophyte) produces, by meiosis, a spore the gives rise to a multicellular, haploid pollen grain (gametophyte)
The human genome is minimally contained in which of the following?
every human cell
Which of following defines a genome?
the complete set of an organism's genes
Which of the following occurs in meiosis but not in mitosis?
synapsis of chromosomes
Why do chromosomes coil during mitosis?
to allow the chromosomes to move without becoming entangled and breaking
Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?
Genetic drift
If, on average, 46% of the loci in a species' gene pool are heterozygous, then the average homozygosity of the species should be
54%
In the formula for determining a population's genotype frequencies, the 2 in term 2pq is necessary because
heterozygotes have two alleles
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?
8%
What is meant by the description "antiparallel" regarding the strands that make up DNA?
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
a particular triplet of bases in template strand of DNA is 5' AGT 3'. the corresponding codon for the mRNA transcribed is
3' UCA 5'
Alternative RNA splicing
can allow the production of proteins of different sizes and functions from a single mRNA.
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