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Dorsal expression is highest in the ventral part of the embryo and is responsible for directing the differentiation of cells in that region toward ventral fates. Why then is the gene called Dorsal, an
E. coli respond to high solute concentrations in its external environment via a signal transduction pathway that involves the molecule EnvZ. Which of the following statements is/are true with regard t
The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of one hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respe
The DNA in humans non gametic cells contains 6 billions base pairs. it is estimate that about 10,000 DNA changes occurs in the cell in one day. there are quickly repaired so that only a few
One evolutionary idea is that the number of amino acids differences in a similar protein from different species can be used as an evolutionary clock. The rate of amino acid substitution varies among p
Malic dehydrogenase (MDh) can exist in two types, A and B. among all fruit flys captured in Austin, TX, 95.7% type A allele where detected and 4.3 % type B alleles were detected. Xanthine oxidase, ano
a)what percentage of the population display the phenotype B?
Punnett and a co-worker studied genetics in sweet peas. they found one gene that controlled purple(P) or red (p) flowers and another that controlled Long (L) or round (l) pollen. Parental true- breedi
If normal GFR is maintained but tubular reabsorption is completely blocked
Examine the principal appendicular muscles of the body and distinguish their origins, insertions, actions, and innervations.
From the laboratory manual, Human anatomy & physiology laboratory manual, fetal pig version, read:
What is the effect of DCCD on electron transport and respiration in suspensions of intact mitochondria?
If the smooth endoplasmic reticulum were removed from the cell, which of the following processes would be most affected?
On July 8th, a woman was given an antibiotic for presumptive sinusitis. However, Her condition worsened, and she was unable to eat for 4 days because of her severe pain and tightness of the jaw. On Ju
Imagine the process of translation. A ribosome is bound to an mRNA and has moved several codons downstream from the start codon. At this point in time, the E site, the P site, and the A site all conta
One thing biologists do in order to determine how a cell or organism works is to find a mutant that does not do the activity. They go on a mutant hunt! Because it can take a long time, biologists spee
Estimating evolutionary time periods by employing gene product differences generates a continuum of very slow changes to relatively rapid changes. Nuclear gene products change(mutate) slower than mito
How you would prepare a cDNA library from the mRNA transcripts produced by ovary cells and mass-produce progesterone using bacteria.1. producing cDNA's from mRNA's 2. cloning the cDNA's into bacterial
In studying evolution, a common characteristic can be compared to determine how much variability exist among species. An example in vertebrate species is the umber of differences in hemoglobin.
Protons are generated during photosynthesis. Describe the fate of these protons and explain how they contribute to the conversion of light energy into chemical energy.
While making yourself a yummy lunch, you realize you are salivating. How can smelling lunch cause your salivary glands to release saliva? In your answer consider sensory systems (smell), neurons (tran
A particular neuron (A) is post-synaptic to two other neurons (B and C). One of the pre-synaptic neurons (B) formed a synapse on cell A's axon initial segment. Neuron C formed a synapse on one of A's
Generally describe three mechanisms for how short RNAs in eukaryotes (siRNAs, miRNAs, and piRNAs) silence expression.
Select the three statements that are true. To review the germ layers and the terminology associated with body cavities.