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WorksheetsMCAS Biology Prep
Total questions: 15
Worksheet time: 15mins
When proteins are broken down, phenylalanine is sometimes produced. Phenylalanine contains the elements carbon, nitrogen, hydrogen, and oxygen. Phenylalanine is which type of compound?
amino acid
fatty acid
monosaccharide
phospholipid
Plants in floodplains often get covered by water during floods. Some plants survive the floods because they can continue photosynthesis underwater. However, the plants’ rates of photosynthesis are much lower underwater than above water.
Which of the following helps to explain why the rates of photosynthesis are lower underwater than above water?
The available light is less intense underwater.
The chloroplasts do not function underwater.
There is too much oxygen in the water.
There is no carbon dioxide in the water.
What directly supplies the energy a cell needs for activities such as moving its cilia or transporting molecules against a concentration gradient?
ATP
Hemoglobin
RNA
Triglycerides
Which of the following describes how DNA determines genetic inheritance?
A long sequence of nucleotides in a specific order codes for a genetic trait.
A set of three nucleotides in a specific order codes for a genetic trait.
A pair of complementary nucleotides codes for a genetic trait.
A single nucleotide codes for a genetic trait.
Inhalation is the process that draws air into the lungs. How does the muscular system work with the respiratory system to make inhalation possible?
The diaphragm muscle contracts to expand the chest and draw air into the respiratory system.
The smooth muscles of the esophagus relax to let air flow into the respiratory system.
The skeletal muscles of the neck contract to pull on the pharynx and draw air into the respiratory system.
The chest muscle relaxes to let air flow into the respiratory system.
Which of the following is always part of normal sexual reproduction?
The male produces gametes by mitosis.
An offspring receives half its chromosomes from each parent.
An offspring looks identical to the parents at birth.
The female carries only one fertilized egg at a time.
Which part of the digestive system eliminates solid wastes from the human body?
rectum
kidneys
liver
pharynx
Because most nerve cells do not typically undergo mitosis, they are generally not capable of which of the following?
generating more nerve cells
producing enzymes
performing cellular respiration
A cell membrane has a double layer of molecules. These molecules are made up of a phosphorus-containing “head” and two long, fatty acid “tails.”
Which of the following best explains why the molecules are classified as lipids?
They are made up of fatty acids.
They form a double layer
They contain phosphorus
They are found in the cell membrane
Which of the following does the human digestive system break down for the body’s cells to use for energy, repair, and growth?
carbohydrates, fats, and proteins
carbohydrates and proteins only
carbohydrates, fats, and oxygen
carbohydrates and fats only
The growth of plants in many ecosystems is limited by the supply of nitrogen. Which of the following groups of organisms plays the largest role in moving nitrogen between the atmosphere and plants?
bacteria
earthworms
insects
protists
The different finch beaks are the result of natural selection. Which of the following conditions was required for natural selection to occur in the Galápagos finches?
some genetic variation in the ancestral population
low death rates for the finches
low mutation rates for the finches
unequal number of males and females in ancestral population
Placental mammals are one group of mammals. Using DNA evidence, scientists have concluded that the ancestor of placental mammals diverged from other mammal groups about 160 million years ago. The analysis of which of the following types of evidence would best verify this conclusion?
fossils
oxygen
carbon dioxide
sunlight
Snakes such as boa constrictors and pythons have tiny leg bones buried in their muscles. These leg bones are vestigial structures that have little or no known function in snakes.
Which best explains the presence of these vestigial structures in snakes?
Snakes evolved from organisms with legs.
Snakes evolved from organisms without legs
Modern day snakes are organisms with legs
Valvular stenosis is a condition in which the heart valves are stiff and do not open completely. In people with this condition, blood flow to the body is decreased. How will valvular stenosis most likely affect body cells?
Body cells will receive less oxygen than usual.
Body cells receive less CO2 than usual.
