pGLO plate observations and gel analysis

H1: Distance is not identity

Friday May 7 pGLO read: the teacher provides the closed plates prepared Thursday May 6 and incubated overnight at 37°C under the approved Bio-Rad kit SOP. Record each actual plate label, count or uncountable-growth description and fluorescence observation under the teacher’s approved viewing setup. Wear UV-protective eyewear or view through a UV-blocking shield, and never look directly at the UV lamp. Never reopen plates. Keep growth and fluorescence as different observations; arabinose-induced GFP expression is not the antibiotic selection step. If plates are absent or failed, record that status and use C1 from May 6 as explicitly invented practice, not replacement observations. Then analyze the assigned authentic gel image or the D1 nominal fallback. A band pattern does not prove plasmid identity. A self-contained count fallback is C1: positive comparison P=12, negative comparison N=0, sample S=8. These invented role labels are not pGLO plate identities or evidence that any kit worked.

Opening input: in this idealized linear-DNA comparison, shorter fragments travel farther through the same gel than longer ones. NHGRI explains this size-separation principle. At 8–10, after the plate-record stage, state why a farther band would suggest a smaller fragment in this model, not a known sequence. One short answer is enough. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

Today is Friday May 7. The May 6 source record is supplied again in full; no prior student completion, actual gel photograph or experiment is assumed. The next listed class is Monday May 10. Start S1 status marks during work and update changes only.

D1: The complete May 6 teaching record

BI-GEL-PAPER-01 is the same original fictional record supplied for May 6. It represents idealized linear double-stranded DNA, not an actual gel photograph, restriction map or construct. Lane order from left to right is L, X, Y, Z. L is the known-size ladder; X and Y are abstract sample labels; Z is a blank comparison lane.

The top reference line is the common origin, 0 mm. Nominal distance increases downward to each drawn band’s center. Values are whole millimeters supplied by the author, not measurements students made. Do not measure the printed page. No actual measurement uncertainty is supplied.

Complete ladder: L1 at 10 mm is 4000 bp; L2 at 20 mm is 2000 bp; L3 at 30 mm is 1000 bp; L4 at 40 mm is 500 bp. Base pairs, abbreviated bp, count DNA length. Millimeters, abbreviated mm, give migration distance. They are different quantities.

Complete samples: X1 at 20 mm; X2 at 30 mm; Y1 at 25 mm; Y2 at 35 mm. Z has no bands drawn. Keep that statement; do not create a zero-mm band or take a logarithm of zero. No band drawn is not proof that DNA or contamination is absent.

Full text alternative to the reference image: L has four centers at 10/20/30/40 mm; X has two at 20/30 mm; Y has two at 25/35 mm; Z has none. Each lane begins at the same top 0-mm line. At 5–20 record the four ladder rows with distance, known size and supplied log value from G1. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

G1: One standard curve with a complete log lookup

At 20–40 make one standard curve in the same analysis record. A base-10 logarithm is the exponent that produces a number when 10 is raised to that power. For example, log10(1000)=3 because 10 cubed is 1000. Logs require positive input; Z is not a zero-sized fragment.

Use these supplied numerical values, to four decimal places: 4000 bp → 3.6021; 2000 bp → 3.3010; 1000 bp → 3.0000; 500 bp → 2.6990. No calculator or outside log table is required. Do not round these logs further before interpolation.

Horizontal axis: Nominal migration distance (mm), from 10 through 40 with ticks every 5. Vertical axis: log10(fragment size expressed in bp), from 2.5 through 3.7 with ticks every 0.1. The supplied blank grid includes those labels. This line graph covers a defined interval; neither axis must start at zero.

Plot the four ladder points (10,3.6021), (20,3.3010), (30,3.0000), (40,2.6990). Draw the idealized straight trend through the points; four-decimal lookup rounding may produce tiny differences. Caption: Original idealized linear-DNA teaching record, not measured calibration. Do not add error bars or invent repeats.

The model applies only from 10 to 40 mm, including both ends. Do not extend it beyond that range. A 45-mm band would be not estimable by this rule. The full-precision relation behind these supplied positions is size(bp)=4000×2^(-(distance_mm−10)/10). This is an authored math rule, not a universal gel law. Use P1’s supplied lookup route instead of calculating powers if preferred. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

P1: Interpolate in log space, then convert back

At 40–55 estimate all four X/Y bands. A sample at a listed ladder distance uses that point’s log value. For a position halfway between adjacent ladder distances, average the two log values, not the two bp sizes. Both Y positions are midpoints. Record each selected or interpolated log before converting back.

The inverse of log10 is 10 raised to the log value. Complete lookup, log → approximate bp: 3.6021 → 4000.369; 3.4515 → 2828.134; 3.3515 → 2246.467; 3.3010 → 1999.862; 3.2505 → 1780.328; 3.1515 → 1417.425; 3.1505 → 1414.165; 3.1495 → 1410.912; 3.0505 → 1123.311; 3.0000 → 1000.000; 2.9495 → 890.225; 2.8505 → 708.761; 2.8495 → 707.131; 2.8485 → 705.505; 2.7495 → 561.694; 2.6990 → 500.035. These values cover every required sample and reference. No outside tool is needed.

Round only the final size to the nearest 10 bp. For this positive-number rule, a value below the halfway point rounds down; at or above it rounds up. Example unrelated to the record: 1234 rounds to 1230 and 1235 rounds to 1240. Keep the log and inverse value visible so the estimate is traceable.

Use columns lane/band, nominal mm, selected or interpolated log, inverse bp, and final rounded bp. Make four sample rows, X1/X2/Y1/Y2, plus Z saying no bands drawn and no size estimated. A hand-drawn line can be imprecise; use the supplied numerical midpoint rule for the final answer. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

T1: Complete fictional expected pattern and comparison rule

At 55–70 compare every sample lane with teaching pattern T. T has exactly two bands, expected sizes 2000 bp and 1000 bp, ordered from larger to smaller. No real restriction-map prediction is supplied, so this abstract length pattern stands in for one during practice. It is not a DNA sequence, real construct or designed restriction map.

Declared rule: the band count must match, and each final rounded estimate must be within 5% of its corresponding expected size. This is a classroom comparison convention, not measured error, a confidence interval or a validated identity test. The bounds are supplied: larger band 1900–2100 bp; smaller band 950–1050 bp, inclusive.

Sort each lane’s estimated sizes from larger to smaller. Compare X and Y to both bounds and check their band counts. Compare Z’s no-band state with T’s two-band requirement. An extra or missing band fails the stated pattern rule; do not ignore one to make a match.

Write one short conclusion in the same record. State each lane’s consistency or inconsistency with T under this rule. Cite its estimates or missing-band state, and give one evidence limit. Pattern consistency does not confirm plasmid identity, sequence or gene orientation. Do not describe an actual restriction digest or transformation as successful.

One useful limit is the idealized linear-DNA assumption. This supplied mapping is not validated for a real circular or other-shaped DNA molecule. Topology means molecular form, such as linear versus circular. Another limit is that different sequences can have the same length; a size pattern alone does not identify sequence. No new experiment is requested. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

Q1: Check one analysis record

At 70–80 check the same ladder table, graph, four estimates, Z statement and conclusion. Verify axis labels and ranges, base 10, midpoint logs, inverse conversion and final nearest-10 rounding. Verify that all lanes were considered and the conclusion says pattern consistency rather than identity confirmation.

Correct a real discrepancy or note one verified match. If a peer truly comments, record that genuine deidentified comment; otherwise mark self review. Do not invent a mistake, actual gel observation or completed earlier lab. The final sentence restates the same conclusion, not a second report. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

S1: Preserve genuine status

Track ten short statuses: 1 teacher acceptance and genuine data/reference; 2 real rubric and expected pattern; 3 actual photograph and measured distances; 4 genuine prior laboratory work and approval. Also track 5 real sequence/identity evidence; 6 actual peer participation; 7 enrolled task/access/completion; 8 confirmed destination/deadline; 9 saved analysis; 10 genuine receipt. Mark completed, pending or not checked with an evidence pointer or missing input.

The pGLO manufacturer SOP is linked for the approved plate route. No authentic gel, restriction map, sequence, gel SOP, photograph or measured band distances are supplied here; those remain separate teacher inputs. The nominal analysis does not complete those obligations. Ask your teacher whether myPLTW Project 6.1.2 applies today and where to stop; paper practice does not complete that portfolio milestone.

Open the linked BI assignment in Turn in your work. If blocked, save the same analysis with missing input, next action and receipt pending. Monday May 10 is the next date; no actual lab completion is carried forward. Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

Plate observations and size-ordering answer

At 0–8, add four kit-condition rows to the same record: +pGLO LB/amp; +pGLO LB/amp/ara; -pGLO LB/amp; -pGLO LB. Columns: actual plate label/ID, preparation and read dates, colony count or uncountable-growth description, fluorescence observation, and status (observed, absent, failed or not assessed). Keep lids closed and use the approved viewing setup. Wear UV-protective eyewear or view through a UV-blocking shield, and never look directly at the UV lamp. Do not predict observations into empty cells. If plates are absent or failed, retain that status; use C1’s three invented P/N/S rows only as a separately labeled practice alternative, never as kit observations. At 8–10, answer H1’s size-ordering question before the gel analysis.

Use the manufacturer plate labels and actual observation record. The P/N/S count fallback has different roles and is not a four-condition pGLO dataset. Keep all work in one product.

Four supplied ladder rows

Original route: Use D1/G1 for the four distances, sizes and supplied logs.

Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

One standard curve

Original route: Use G1 to plot the four ladder points on the response grid.

Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

Four estimates and Z status

Original route: Use P1 for all X/Y estimates and explicit no-band Z row.

Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

All-lane comparison and bounded conclusion

Original route: Use T1 to compare X/Y/Z with the complete pattern and declared bounds.

Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.

Check and save the same analysis

Original route: Use Q1/S1 to verify and save the same product and genuine statuses.

Actual route: use the teacher’s genuine data, comparison rule and rubric in place of this practice. Complete one analysis record. Missing authentic inputs, approval and receipt remain pending.