Life Sciences
Seven thousand years ago, a species of oryx indigenous to the Arabian Peninsula was separated when an earthquake caused an insurmountable barrier to form between different geological segments of the population. A recent population genetics study showed that the two populations were no longer able to successfully interbreed. Careful testing of these two species found that a physiological change in one species was responsible for the mating incompatibility between the two populations. What best describes the nature of this mating incompatibility?
What is Mechanical Difference?
The cohesion of water is caused by
What are hydrogen bonds?
A certain machine exerts a force of 200 newtons on a box whose mass is 30 kilograms. The machine moves the box a distance of 20 meters along a horizontal floor. What amount of work does the machine do on the box?
What is 4000 Joules?
What is the integral of ex^2?
What is DNE?
There are two ducks in front of a duck, two ducks behind a duck and a duck in the middle. How many ducks are there?
What is three ducks?
An unknown molecule is added to an enzyme-catalyzed reaction, immediately decreasing its rate. If the addition of more substrate has no effect, but the addition of an antibody for the unknown molecule restores the initial reaction rate, what form of inhibition is most likely occurring?
What is Noncompetitive Inhibition?
What does synthesis gas (water gas) consist of?
What is carbon monoxide (CO) and hydrogen (H2)?
The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is:
What is 0.625 grams?
Where is AP grading taking place for 2023?
What is AP grading will be graded remotely at home?
A hen and a half lays an egg and a half in a day and a half. How many eggs does one hen lay in one day?
What is 24 eggs?
The drug, DNP, destroys the H+ gradient that forms in the electron transport chain. What is the most likely consequence?
What is fermentation? / What is anaerobic respiration?
How many mL of 17 M NH3 must be diluted to 500.0 mL to make a 0.75 M solution?
What is 22 mL?
The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the direction of the magnetic field is:
What is 90 degrees?
Where was Colin Mclaurin born?
What is Kilmodan?
If all the people in Australia joined hands and stretched themselves out in a straight line, how long would it reach?
(Hint: The population of Australia is about 20 million, and the area of Australia is about 7,700,000 sq. km)
What is 56 million centimeters? / What is 56 * 106 cm?
Suppose that in a mammalian species, the allele for black hair (B) is dominant to the allele for brown hair (b), and the allele for curly hair (C) is dominant to the allele for straight hair (c). When an organism of unknown genotype is crossed against one with straight, brown hair, the phenotypic ratio is as follows:
25% curly black hair
25% straight black hair
25% curly brown hair
25% straight brown hair
What is the genotype of the unknown parent?
What is BbCc?
Which of the following species is NOT planar?
(A) CO32-
(B) NO3-
(C) ClF3
(D) BF3
(E) PCl3
What is PCl3?
What is the name of this formula? Φ = q/ε0
What is Gauss’s Law?
Why is calculus called calculus?
What is “In Latin, calculus means “pebble.” Because the Romans used pebbles to do addition and subtraction on a counting board, the word became associated with computation”?
Kenny, Abby, and Ned got together for a round-robin pickleball tournament, where, as usual, the winner stays on after each game to play the person who sat out that game. At the end of their pickleball afternoon, Abby is exhausted, having played the last seven straight games. Kenny, who is less winded, tallies up the games played: Kenny played eight games, Abby played 12 games, and Ned played 14 games.
Who won the fourth game against whom?
What is Ned won the fourth game against Kenny?
Which bacterium can survive refrigeration temperatures, is often linked to foodborne illness outbreaks involving raw milk, ice cream, cheese, and deli meats, and is especially dangerous for pregnant people because it can cross the placenta and infect a fetus?
What is Listeria?
An antacid tablet containing Mg(OH) (s) (molar mass 58.3 g/mol) is titrated with a 0.100 M solution of HNO (aq). The end point is determined by using an indicator. The initial buret reading is 2.17 mL and the final buret reading is 22.17 mL. What was the mass of the Mg(OH)(s) in the antacid tablet?
What is 0.0583 g?
A carousel—a horizontal rotating platform—of radius r is initially at rest, and then begins to accelerate constantly until it has reached an angular velocity ω after 2 complete revolutions. What is the angular acceleration of the carousel during this time?
What is ω2/8π?
What is the 25th derivative of sinxcosx?
What is 224sin(2x)?
Decode the following message: zjplujl vsftwphk pz zv jvvs!
What is science olympiad is so cool?