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In a flower, what would be the chromosome number of the ovule, embryo sac, and endosperm?
A. Diploid, haploid, diploid.
B. Haploid, diploid, haploid.
C. Haploid, haploid, diploid.
D. Diploid, diploid, triploid.
E. Diploid, haploid, haploid.
A cross is made between two E. coli strains: (Hfr arg+?bio+?leu+) x (F? arg??bio??leu?). Interrupted-mating studies show that arg+ enters the recipient last, so arg+ recombinants are selected on a medium containing biotin and leucine only.
How do the components of the lymphatic system protect the body from disease?
Estimate the sequence of hexapeptide on the basis of the following data. When the sequence is not known, a comma separates the amino acids.
If a woman who is red-green color-blind, an X-linked trait, married a man with normal vision, what phenotypic ratios would you expect to observe in their children?
Explain the probability that the first child of parents who are heterozygous for both traits will show the achondroplasia however not the Huntington's disorder?
What characteristics are sed to classify viruses into familes.
Briefly describe the cellular events that occur during epithelial mesenchymal transitions (EMT).
A tumor is pressing against a jugular foramen on one side and an individual's ability to swallow is affected. Which two cranial nerves can be involved?
Which membrane transport mechanism is found in eukaryotic cells.
Suppose a primer initiates the replication process in E. Coli and forms a 20bp (base pair) long stretch. Assume an error rate of 2/1000bp in primer that is taking place only in the lagging strand of DNA during replication.
Assume you performed a gram stain on a sample from a pure culture of bacteria and observed a field of red and purple cocci. Adjacent cell were not always the similar colour. What do you conclude.
Living organisms make and use three main types of ribonucleic acids for their biological functions: ribosomal RNA (rRNA) messenger RNA transfer RNA.
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