Sat Past Questions And Answers
In a certain flower, a blue petal phenotype is dominant to a white petal phenotype. If you cross a heterozygous flower with a homozygous recessive flower, what is the probability of inheritance for the white petal phenotype?
- A. 50%
- B. 100%
- C. 75%
- D. 0%
Which of the following neurotransmitters is the primary inhibitory neurotransmitter in the human central nervous system?
- A. GABA
- B. Acetylcholine
- C. Glutamate
- D. Serotonin
A population of sloths lives in a forest. New trees start to take over the forest, and these new trees make it easier for sloths with longer arms to climb them. The sloths with longer arms survive longer and produce more offspring than their shorter-armed counterparts. The sloths with the shortest arms die quickly and do not produce many offspring. What can you predict will happen to the average arm length of the sloths in this population over time?
- A. The average arm length of sloths in this population will increase.
- B. The average arm length of sloths in this population will decrease.
- C. The average arm length of sloths in this population will decrease and then increase.
- D. The average arm length of sloths in this population will stay the same.
Within baleen whale species, some individuals develop an accessory spleen—a seemingly functionless formation of splenetic tissue outside the normal spleen. Given the formation’s greater prevalence among whales known to make deeper dives, some researchers hypothesize that its role isn’t ______; rather, the accessory spleen may actively support diving mechanisms. Which choice completes the text with the most logical and precise word or phrase?
- A) replicable
- B) predetermined
- C) operative
- D) latent
Mammals that lay eggs, such as the platypus or echidna, are called which of the following?
- A. Marsupials
- B. Placentals
- C. Prokaryotes
- D. Monotremes
Determine the mean of the following numbers: [?2,?6,11,13,2,0]
- A. 4
- B. 3
- C. 17/3
- D. 9
In 2014, Amelia Quon and her team at NASA set out to build a helicopter capable of flying on Mars. Because Mars’s atmosphere is only one percent as dense as Earth’s, the air of Mars would not provide enough resistance to the rotating blades of a standard helicopter for the aircraft to stay aloft. For five years, Quon’s team tested designs in a lab that mimicked Mars’s atmospheric conditions. The craft the team ultimately designed can fly on Mars because its blades are longer and rotate faster than those of a helicopter of the same size built for Earth. According to the text, why would a helicopter built for Earth be unable to fly on Mars?
- A) Because Mars and Earth have different atmospheric conditions
- B) Because the blades of helicopters built for Earth are too large to work on Mars
- C) Because the gravity of Mars is much weaker than the gravity of Earth
- D) Because helicopters built for Earth are too small to handle the conditions on Mars
Find the median: a=[?5,?1?1,0,?2,?9]
- A. ?3/2
- B. ?1/2
- C. {There is no median.}
- D. ?1
There is a table of flowers prepared for sale. Twelve flowers are 10 inches tall, five are 12 inches tall, and four are 15 inches tall. What is the median height of these flowers?
- A. 15 in
- B. 10 in
- C. 11 in
- D. 12 in
Asparagine is an example of an amino acid. If you put asparagine and other amino acids together in a chain, you would get what organic compound?
- A. A carbohydrate
- B. A lipid
- C. A protein
- D. A nucleic acid