Chemistry
What type of bond forms when atoms share electron pairs?
Covalent bonds
What organelle is nicknamed the powerhouse of the cell?
Mitochondria
What force keeps us on the ground instead of floating away?
Gravity
What is the largest organ of the human body?
Skin
Which animal has three hearts?
Octopus
What is the hybridization of the central carbon atom in CO₂?
sp
What molecule carries genetic instructions from DNA to ribosomes?
Messenger RNA (mRNA)
What travels faster: light or sound?
Light
Which organ filters waste from your blood to produce urine?
Kidneys
What is the difference between weather and climate?
Weather describes short-term atmospheric conditions; climate describes long-term patterns and averages
A reaction has a negative ΔG. Is it thermodynamically spontaneous under those conditions?
Yes
What type of cell division produces four genetically different haploid cells?
Meiosis
An object is thrown straight up. At its highest point, what is its velocity, and what is its acceleration (ignoring air resistance)?
Velocity is momentarily zero; acceleration is still approximately 9.8 m/s² downward.
Why can you feel dizzy if you stand up too quickly?
Blood pressure can briefly drop, reducing blood flow to the brain before your body compensates.
What is the name for the process in which organisms convert atmospheric nitrogen into ammonia or related biologically available forms?
Nitrogen Fixation
You react 2-bromobutane with a strong nucleophile in a typical SN2 reaction. What happens to the stereochemistry at the carbon being attacked?
Inversion of configuration
A diploid organism has 2n = 16 chromosomes. How many chromosomes are present in each cell after meiosis I?
8
Why does a straw appear bent when placed in a glass of water?
Refraction: light changes direction as it passes between water and air.
Which part of the nephron is primarily responsible for reabsorbing the largest fraction of filtered water and sodium under normal conditions?
The proximal convoluted tubule.
Why can a species with high genetic diversity have a better chance of surviving a new environmental disease than a genetically uniform population?
Greater genetic variation increases the chance that some individuals carry traits that confer resistance or tolerance, allowing those individuals to survive and reproduce.
Which is generally more acidic: a terminal alkyne or an alkane, and why?
A terminal alkyne, because its conjugate base places the negative charge on an sp-hybridized carbon with greater s-character, stabilizing the charge.
Two unaffected parents have a child with an autosomal recessive disease. What is the probability their next child will also have it?
25% (1/4), assuming both parents are carriers
A 2 kg object accelerates at 3 m/s². What is the net force acting on it?
Reveal answer
6N (F = ma; 2 x 3)
During a typical immune response, which cells differentiate into plasma cells that secrete antibodies?
B lymphocytes (B cells)
Bananas are slightly radioactive. Which element is responsible?
Potassium